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Mineral Specimens - page 20
The Desmond Sacco Collection

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Text: Carles Curto (formerly curator of the Geology Museum, Barcelona) & Jordi Fabre
Assistance from John S. White (former Smithsonian curator)

 


Desmond Sacco is an authority when it comes to African as well as worldwide minerals. I met him many years ago at the Munich Show when it was in the city of Munich and Desmond was one of the stars of the show, buying the best that appeared there. His collection was legendary, not only because of the wonders we knew he would certainly have acquired given his position in the mines of the Kalahari Manganese Field (Hotazel, Wessels, N'Chwaning...) and his proximity to the legendary Tsumeb, but also because we saw what he was buying, and thus got an idea of the quality of his collection.

Many years and many mineral Munich shows have now passed and, for the first time, Desmond Sacco has decided to sell some specimens from his collection, starting with miniatures and thumbnails and some cabinet specimens. We have been fortunate to acquire the first batch, consisting of material from Tsumeb and the Kalahari, and with these we can make a virtual trip to the mines and minerals guided by Desmond and his collecting criteria.


From the web page of Desmond Sacco


We hope you enjoy these samples, which represent an important part of mineralogy and mineral collecting in Africa.

Jordi Fabre

The Desmond Sacco Collection


Tarbuttite with Hydroxylapatite and Hemimorphite
Tarbuttite with Hydroxylapatite and Hemimorphite. Tarbuttite with Hydroxylapatite and Hemimorphite.

MA16AI5: Fanlike growths of acicular Hydroxylapatite and Hemimorphite micro-crystals on Tarbuttite crystals, distinguishable by its green color. Of high quality, as is usual with samples from the Desmond Sacco collection.
Skorpion Mine, Rosh Pinah, Lόderitz District, Karas Region  Namibia (2016)

Specimen size: 6.4 × 5.2 × 4.6 cm = 2.5” × 2.0” × 1.8”

Main crystal size: 1.1 × 0.7 cm = 0.4” × 0.3”

Fluorescence short UV & minor fluorescence long UV

Former collection of Desmond Sacco




Order
Skorpionite with Tarbuttite

MB70AA7: Aggregate of white acicular Skorpionite crystals. They are very bright and very rich for the species. The Skorpionite, very fluorescent under a UV lamp,is coating a matrix with Tarbuttite crystals with a uniform green color.
The sample, of great quality and from the type locality for the species, is from the Desmond Sacco collection whose label we will send to the buyer.
The specimen has been reviewed, photographed and published in the magazine ‘Rivista Mineralogica Italiana’ on page 202 in number 2015/3
Skorpion Mine, Rosh Pinah, Lόderitz District, Karas Region  Namibia (2004)

Specimen size: 4.5 × 2.8 × 2.6 cm = 1.8” × 1.1” × 1.0”

Main crystal size: 0.1 × 0.1 cm = 0.0” × 0.0”

Type locality

With handwritten label from the Desmond Sacco Collection

Intense fluorescence short UV & minor fluorescence long UV



Skorpionite with Tarbuttite.
Skorpionite with Tarbuttite. Detail
Detail
Skorpionite with Tarbuttite. Photo micro
Photo micro
Sold
Beryl (variety aquamarine) with Schorl and Albite
Beryl (variety aquamarine) with Schorl and Albite. Front
Front
Beryl (variety aquamarine) with Schorl and Albite. Side
Side

MV91AI5: Very well defined Beryl (aquamarine variety) crystals. They have excellent terminations, are transparent and bright, have a very well defined and uniform sky blue color and are on an Albite matrix with very bright Schorl crystals. Of high quality as is usual with samples from the Desmond Sacco collection.
Erongo Mountain, Usakos, Erongo Region  Namibia (±2016)

Specimen size: 7.3 × 4.4 × 3.9 cm = 2.9” × 1.7” × 1.5”

Main crystal size: 1.7 × 0.6 cm = 0.7” × 0.2”

Former collection of Desmond Sacco

Albite minor fluorescence short UV



Order
Prehnite with Quartz

MB6AI5: Double spheroidal Prehnite growth with very well defined polycrystalline surfaces. It is translucent, bright with a uniform pale green color and is implanted on a matrix coated by white Quartz. Of high quality, as is usual with samples from the Desmond Sacco collection.
Erongo Mountain, Usakos, Erongo Region  Namibia (±2008)

Specimen size: 5.8 × 5.2 × 3.5 cm = 2.3” × 2.0” × 1.4”

Main crystal size: 3.8 × 3.4 cm = 1.5” × 1.3”

Former collection of Desmond Sacco




Prehnite with Quartz. Front
Front
Prehnite with Quartz. Rear
Rear
Prehnite with Quartz. Top
Top
Order
Scepter Quartz (variety amethyst / variety smoky)
Scepter Quartz (variety amethyst / variety smoky). Front
Front
Scepter Quartz (variety amethyst / variety smoky). Rear
Rear
Scepter Quartz (variety amethyst / variety smoky). Side
Side
Scepter Quartz (variety amethyst / variety smoky). Side
Side

ED91AH2: Scepter growth on a colorless Quartz crystal stem of a very sharp doubly terminated crystal, with very neat window-like and phantom growths. The crystal, transparent and extraordinarily bright, has a smoky color with amethyst shades.
The sample is form the Desmond Sacco collection which label we’ll send to the buyer.
Goboboseb Mountains, Brandberg area, Erongo Region  Namibia

Specimen size: 7.1 × 4.9 × 3.7 cm = 2.8” × 1.9” × 1.5”

With handwritten label from the Desmond Sacco Collection




Sold
Schorl with Quartz

DT37AC7: Aggregate of short prismatic Schorl crystals, some of them doubly terminated, with very well defined faces and edges. They are very bright and are with small Quartz crystals.
Davib East Farm 61 (Davib Ost Farm), Karibib District, Erongo Region  Namibia

Specimen size: 8 × 7.7 × 3.6 cm = 3.1” × 3.0” × 1.4”

Main crystal size: 3.9 × 2.4 cm = 1.5” × 0.9”

With handwritten label from the Desmond Sacco Collection




Schorl with Quartz. Schorl with Quartz.
Sold
Cassiterite with Muscovite and Quartz (variety smoky)
Cassiterite with Muscovite and Quartz (variety smoky). Cassiterite with Muscovite and Quartz (variety smoky).

DP98AF2: Twinned Cassiterite crystals that are transparent and extraordinarily bright, with very well defined faces and edges. They are on a rocky matrix coated by Muscovite crystals and transparent smoky Quartz crystals.
The sample is from the Desmond Sacco collection, whose label we’ll send to the buyer.
Merekski District, Bureya Massif, Khabarovskiy Kray, Far-Eastern Region  Russia

Specimen size: 4.8 × 2.9 × 3.5 cm = 1.9” × 1.1” × 1.4”

Main crystal size: 1.4 × 1.2 cm = 0.6” × 0.5”

With handwritten label from the Desmond Sacco Collection




Sold
Doubly terminated Calcite

DR91AC7: Aggregate of Calcite crystals, some of them doubly terminated and one that is clearly dominant. They consist of a hexagonal prism and very flat terminal rhombohedra. They are colorless, clear, and very bright.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 8.6 × 6 × 5.8 cm = 3.4” × 2.4” × 2.3”

Main crystal size: 8.2 × 3.4 cm = 3.2” × 1.3”

Fluorescence short UV & minor fluorescence long UV

With handwritten label from the Desmond Sacco Collection




Doubly terminated Calcite. Front
Front
Doubly terminated Calcite. Side
Side
Doubly terminated Calcite. Top
Top
Sold
Calcite with Sphalerite and Galena
Calcite with Sphalerite and Galena.

DY47AE7: Aggregate of platy white Calcite crystals that are, in fact, flattened rhombohedra. They are translucent, bright, with fine growth striations on a matrix with Sphalerite, Galena and small Quartz crystals.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 9.1 × 5 × 2.4 cm = 3.6” × 2.0” × 0.9”

Minor fluorescence long & short UV

With handwritten label from the Desmond Sacco Collection




Sold
Calcite

DM89AE3: The crystal, very large for the locality, combines a prism and a terminal rhombohedron, with very well defined polycrystalline faces. I It is translucent and bright with a very intense and uniform pink color. There is a small bit of Sphalerite at its base.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 10.2 × 8.8 × 7.8 cm = 4.0” × 3.5” × 3.1”

Very fluorescent long & short UV

With handwritten label from the Desmond Sacco Collection




Calcite. Front
Front
Calcite. Top
Top
Order
Ilvaite with Calcite and Pyrite
Ilvaite with Calcite and Pyrite. Front
Front
Ilvaite with Calcite and Pyrite. Top
Top

DY39AE2: Aggregate of Ilvaite crystals with bright and very well defined faces and edges, on a matrix of very platy Calcite crystals partially coated by small cubic Pyrite crystals. The Ilvaites from Dalnegorsk, relatively abundant some years ago, are now scarce, even moreso in this quality.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 5.6 × 3.8 × 3.3 cm = 2.2” × 1.5” × 1.3”

Main crystal size: 3.8 × 1.8 cm = 1.5” × 0.7”

Calcite fluorescent long & short UV

With handwritten label from the Desmond Sacco Collection




Order
Galena with Sphalerite, Calcite, Tetrahedrite (group) and Chalcopyrite

DB93AD9: Cubic Galena crystals with small octahedral faces. They are very well defined and extraordinarily bright, with polycrystalline and skeletal growths. They are with Sphalerite (marmatite variety), Tetrahedrite, Chalcopyrite and are coated by white growths of Calcite microcrystals. An excellent sample from the prestigious collection of Desmond Sacco.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 11.7 × 9.7 × 8.3 cm = 4.6” × 3.8” × 3.3”

Main crystal size: 4 × 3.8 cm = 1.6” × 1.5”

With handwritten label from the Desmond Sacco Collection




Galena with Sphalerite, Calcite, Tetrahedrite (group) and Chalcopyrite. Front
Front
Galena with Sphalerite, Calcite, Tetrahedrite (group) and Chalcopyrite. Top
Top
Galena with Sphalerite, Calcite, Tetrahedrite (group) and Chalcopyrite. Galena with Sphalerite, Calcite, Tetrahedrite (group) and Chalcopyrite.
Sold
Pyrrhotite with Quartz and Sphalerite
Pyrrhotite with Quartz and Sphalerite. Pyrrhotite with Quartz and Sphalerite.

DV28AC7: Aggregate of thick tabular Pyrrhotite crystals with very well defined faces and edges. They are bright and on a Sphalerite matrix with Quartz crystals.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 5.8 × 4.5 × 3.4 cm = 2.3” × 1.8” × 1.3”

Main crystal size: 2.7 × 2.5 cm = 1.1” × 1.0”

With handwritten label from the Desmond Sacco Collection




Order
Pyrrhotite with Calcite and Quartz

DT89AC7: Aggregate of short prismatic Pyrrhotite crystals with very well defined faces and edges. They are bright and partially coated by very small cubo-octahedral Galena crystals, very sharp rhombohedral Calcite and small Quartz crystals.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 10.2 × 6.7 × 6.6 cm = 4.0” × 2.6” × 2.6”

Main crystal size: 5 × 4 cm = 2.0” × 1.6”

Calcite minor fluorescence long & short UV

With handwritten label from the Desmond Sacco Collection




Pyrrhotite with Calcite and Quartz. Front
Front
Pyrrhotite with Calcite and Quartz. Side
Side
Pyrrhotite with Calcite and Quartz. Top
Top
Sold
Datolite with Fluorapophyllite-(K) and Garnet
Datolite with Fluorapophyllite-(K) and Garnet. Datolite with Fluorapophyllite-(K) and Garnet.

DG97AC7: Very well defined Datolite crystals, translucent, very bright, with an intense and uniform green color, partially coated by small Fluorapophyllite-(K) crystals and on a matrix very rich in garnet, probably Grossular.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 7.2 × 5.3 × 3.5 cm = 2.8” × 2.1” × 1.4”

Main crystal size: 2.7 × 2 cm = 1.1” × 0.8”

With handwritten label from the Desmond Sacco Collection




Sold
Datolite with Ilvaite

DQ89AC4: Tabular Datolite crystals, between transparent and translucent, very bright and with very well defined faces and edges and with related Ilvaite crystals, some doubly terminated, very bright and with sharp faces and edges. The association of both species, apart from its esthetics, is quite rare. The sample is from the Desmond Sacco collection, whose label we’ll send to the buyer.
Dalnegorsk, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 7.3 × 5.6 × 2.6 cm = 2.9” × 2.2” × 1.0”

Main crystal size: 2.2 × 1.6 cm = 0.9” × 0.6”

With handwritten label from the Desmond Sacco Collection




Datolite with Ilvaite. Front
Front
Datolite with Ilvaite. Side
Side
Datolite with Ilvaite.
Sold
Quartz (variety prase) with Andradite
Quartz (variety prase) with Andradite. Front
Front
Quartz (variety prase) with Andradite. Rear
Rear

DR67AC4: Aggregate of crystals that have polycrystalline surfaces and with the tapered shape typical of the samples from the locality. The sample, very aerial and esthetic, is bordered, at the base, by small Andradite crystals. The sample is from the Desmond Sacco collection, whose label we’ll send to the buyer.
Sinerechenskoe, Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region  Russia

Specimen size: 6.5 × 5.5 × 3.3 cm = 2.6” × 2.2” × 1.3”

Main crystal size: 5.8 × 2 cm = 2.3” × 0.8”

With handwritten label from the Desmond Sacco Collection




Order
Stibnite with Baryte

DV6AC7: A cluster of Stibnite crystals, one of them clearly dominant, with a termination that is very rich in faces that are very well defined, bright and partially coated by very sharp and laminar Baryte crystals.
Kadamzhay Mine, Fergana Valley, Alai Range, Osh Oblast  Kyrgyzstan

Specimen size: 5.9 × 1.9 × 1 cm = 2.3” × 0.7” × 0.4”

Main crystal size: 5.9 × 0.7 cm = 2.3” × 0.3”

With handwritten label from the Desmond Sacco Collection




Stibnite with Baryte. Front
Front
Stibnite with Baryte. Rear
Rear
Sold

Kalahari Manganese Fields

Hematite with Baryte
Hematite with Baryte. Front
Front
Hematite with Baryte. Top
Top
Hematite with Baryte.

MF66AI5: Very esthetic group of twinned Hematite crystals with very well defined faces, with the typical shape for this area, extraordinarily bright, on matrix with small White Barite coatings. We note that being from the Wessels mine and not from the N’Chwaning mine it is even more exceptional. Of high quality, as is usual with samples from the Desmond Sacco collection.
Wessels Mine, Hotazel, Kalahari manganese field (KMF), Northern Cape Province  South Africa (±1980)

Specimen size: 7.7 × 6 × 3.7 cm = 3.0” × 2.4” × 1.5”

Main crystal size: 1.2 × 1.1 cm = 0.5” × 0.4”

Former collection of Desmond Sacco


Euro:1600 / US$1812 / Yen:205850 / AUD$2500

Reservado
Hematite with Calcite and Celestine

TA47Q5: Twinned Hematite crystal with a very good luster and very well defined faces and edges, positioned esthetically on its matrix of white Calcite that gives a nice contrast to the piece.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa

Specimen size: 3.6 × 2.5 × 2.4 cm = 1.4” × 1.0” × 0.9”

Main crystal size: 2.2 × 1.6 cm = 0.9” × 0.6”

Former collection of Desmond Sacco




Hematite with Calcite and Celestine. Front
Front
Hematite with Calcite and Celestine. Rear
Rear
Sold
Manganite
Manganite. Manganite.

VG97AE5: Druse of Manganite crystals with a thin flattened prismatic shape, some of them doubly terminated, with parallel growths, extraordinarily bright and on matrix.
The sample is from the Desmond Sacco collection, who's label we’ll send to the buyer.
N'Chwaning I Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (±1952)

Specimen size: 5.4 × 3.4 × 3.2 cm = 2.1” × 1.3” × 1.3”

Main crystal size: 0.3 × 0.1 cm = 0.1” × 0.0”

Former collection of Desmond Sacco




Order
Olmiite with Calcite

MX56V7: Bundled aggregates of Olmiite crystals with slightly curved faces and edges, good color and excellent luster, on matrix and on a base of scalenohedral Calcite crystals. The sample is from the Desmond Sacco collection whose label we’ll send to the buyer.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (±2008)

Specimen size: 5.5 × 4.4 × 3.4 cm = 2.2” × 1.7” × 1.3”

With handwritten label from the Desmond Sacco Collection

Fluorescent long & short UV



Olmiite with Calcite. Olmiite with Calcite.
Sold
Olmiite with Calcite
Olmiite with Calcite. Front
Front
Olmiite with Calcite. Side
Side
Olmiite with Calcite.

MF11V0: Splendid and not common association of Olmiite, forming groups of bright crystals, slightly pinkish, with very acute scalenohedral crystals of Calcite that are colorless, transparent and extraordinarily bright. One of the best pieces from this find.
N'Chwaning II Mine, upper levels, Kuruman, Kalahari manganese fields, Northern Cape  South Africa (12/2008)

Specimen size: 9.4 × 6.4 × 5.3 cm = 3.7” × 2.5” × 2.1”

With handwritten label from the Desmond Sacco Collection

Calcite fluorescent short UV & low fluorescence long UV



Sold
Calcite

ML67V7: Group of sharp rhombohedral crystals slightly modified by the scalenohedron. The crystals are colorless, bright and between transparent and translucent. The sample is from the Desmond Sacco collection whose label we’ll send to the buyer.
N'Chwaning II Mine, upper levels, Kuruman, Kalahari manganese fields, Northern Cape  South Africa

Specimen size: 6.5 × 6 × 4.9 cm = 2.6” × 2.4” × 1.9”

Main crystal size: 4.5 × 2.6 cm = 1.8” × 1.0”

Fluorescent long & short UV

With handwritten label from the Desmond Sacco Collection




Calcite.
Order
Calcite
Calcite. Front
Front
Calcite. Side
Side

TF67S1: Group of crystals, one of them clearly dominant, with very well defined faces and edges, between white and clear, the main one very transparent and with inclusions of crystallized Hematite. The sample is considerably better than the picture shows.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (1998)

Specimen size: 7.2 × 5.1 × 5 cm = 2.8” × 2.0” × 2.0”

Main crystal size: 4.1 × 3.3 cm = 1.6” × 1.3”

Fluorescence short UV & minor fluorescence long UV

With handwritten label from the Desmond Sacco Collection




Order
Calcite with Hematite

ME97R8: Scalenohedral crystal of Calcite with polycrystalline surfaces on its faces. The base is a group of very bright Hematite crystals with very well defined faces and edges.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (2008)

Specimen size: 6.3 × 6.3 × 3.8 cm = 2.5” × 2.5” × 1.5”

Main crystal size: 5.4 × 4.1 cm = 2.1” × 1.6”

With handwritten label from the Desmond Sacco Collection




Calcite with Hematite.
Order
Hydroxyapophyllite-(K)
Hydroxyapophyllite-(K). Hydroxyapophyllite-(K).

DL27AC7: Druse of very well defined crystals formed by the prism, the dipyramid and the terminal pinacoid. They are between transparent and translucent, are very bright and have a pale pink color.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa

Specimen size: 6.8 × 5.4 × 2.7 cm = 2.7” × 2.1” × 1.1”

Main crystal size: 1.1 × 1.1 cm = 0.4” × 0.4”

With handwritten label from the Desmond Sacco Collection




Sold
Rhodochrosite with Gonyerite and Shigaite

MF50R8: A botryoidal crust of Rhodochrosite crystals. They are transparent and bright and have a very intense color. The matrix is also very rich in botryoidal aggregates of gray, slightly greenish, Gonyerite. Although at first the secondary species was labeled (with question) Orlimanite, an analysis indicates that it is really Gonyerite, an extremely rare silicate of manganese of the Chlorite group. We'll send a copy of the analysis to the buyer of the piece.
The specimen has been reviewed, photographed and published in the magazine ‘‘Mineral Up’’ on page 38 in number 2011/2
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa (±2007)

Specimen size: 11 × 9.5 × 7.3 cm = 4.3” × 3.7” × 2.9”

With handwritten label from the Desmond Sacco Collection

Rhodochrosite fluorescent long & short UV



Rhodochrosite with Gonyerite and Shigaite.
Rhodochrosite with Gonyerite and Shigaite. Rhodochrosite with Gonyerite and Shigaite.
Sold

Tsumeb

Twinned Cerussite
Twinned Cerussite. Front
Front
Twinned Cerussite. Side
Side

TP76R8: Twinned crystals with sharp and very well defined faces and edges. They are transparent, very bright and have notable phantom growths. An excellent miniature.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 3 × 2.8 × 1.7 cm = 1.2” × 1.1” × 0.7”

Main crystal size: 2.6 × 1.7 cm = 1.0” × 0.7”

Former collection of Desmond Sacco

Minor fluorescence short UV




Sold
Cerussite

TN27S1: Group of crystals forming multiple cyclic twins. They are clear translucent, very bright and on matrix.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1987)

Specimen size: 4.6 × 3.9 × 3.5 cm = 1.8” × 1.5” × 1.4”

Minor fluorescence short UV

With handwritten label from the Desmond Sacco Collection




Cerussite. Front
Front
Cerussite. Rear
Rear
Order
Cerussite
Cerussite.

MY36R8: Group of twinned elongated prismatic crystals. They are translucent, with defined faces and edges, and have good acute terminations.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1978)

Specimen size: 5.8 × 4.5 × 4.3 cm = 2.3” × 1.8” × 1.7”

Main crystal size: 5.5 × 2 cm = 2.2” × 0.8”

Minor fluorescence short UV

With handwritten label from the Desmond Sacco Collection




Order
Cerussite

TE98AC2: Aggregate of cyclic twins with very sharp tabular Cerussite crystals that are transparent, very bright and on a Galena matrix.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1985)

Specimen size: 6.9 × 4 × 3.2 cm = 2.7” × 1.6” × 1.3”

Main crystal size: 1.5 × 1.5 cm = 0.6” × 0.6”

Minor fluorescence short UV

With handwritten label from the Desmond Sacco Collection




Cerussite. Cerussite.
Order
Cerussite with Mimetite and Malachite
Cerussite with Mimetite and Malachite. Cerussite with Mimetite and Malachite.

MR6AC9: Single Cerussite crystal with slightly curved faces and edges, translucent, with a rough aspect on its faces, on matrix with minor Malachite and small yellow Mimetite crystals. The sample is from the Desmond Sacco collection, whose label we’ll send to the buyer.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 9.1 × 8.9 × 6.2 cm = 3.6” × 3.5” × 2.4”

Main crystal size: 3 × 2.6 cm = 1.2” × 1.0”

Former collection of Desmond Sacco




Order
Smithsonite

TE67Q5: Clear yellow crystal formed by a ditrigonal prism and a very acute terminal rhombohedron. The termination below, even not being especially defined, is complete.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 2.5 × 1.3 × 1.3 cm = 1.0” × 0.5” × 0.5”

With handwritten label from the Desmond Sacco Collection

With handwritten label from the Desmond Sacco Collection




Smithsonite. Front
Front
Smithsonite. Rear
Rear
Sold
Cuprian Smithsonite
Cuprian Smithsonite. Front
Front
Cuprian Smithsonite. Rear
Rear

MQ50V0: Globular aggregates on matrix of small rhombohedral crystals with curved faces and edges. They are bright and they have a very deep green color corresponding to the cuprian variety of this species.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1970-1985)

Specimen size: 10.4 × 9.2 × 6.4 cm = 4.1” × 3.6” × 2.5”

With handwritten label from the Desmond Sacco Collection




Sold
Cobaltoan Smithsonite

MR37T7: Group of rhombohedral Smithsonite crystals with curved faces and edges and a lenticular shape. They are pale pink color and have very well defined brown inclusions of iron oxides on their edges.
With a handwritten Sacco collection label, that we’ll send to the buyer.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1970-1985)

Specimen size: 3.8 × 2.7 × 2.2 cm = 1.5” × 1.1” × 0.9”

Main crystal size: 1.4 × 0.7 cm = 0.6” × 0.3”

With handwritten label from the Desmond Sacco Collection

Minor fluorescence long & short UV



Cobaltoan Smithsonite.
Sold
Cobaltoan Smithsonite
Cobaltoan Smithsonite. Cobaltoan Smithsonite.

MY27T7: Druze of rhombohedral crystals with curved faces and edges and a lenticular shape. They are bright and have a very intense pink color and they are more aerial than usual for samples from Tsumeb.
With a handwritten Sacco collection label, that we’ll send to the buyer.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1970-1985)

Specimen size: 5.8 × 4.8 × 2.2 cm = 2.3” × 1.9” × 0.9”

Main crystal size: 0.7 × 0.7 cm = 0.3” × 0.3”

With handwritten label from the Desmond Sacco Collection




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Dioptase with Cerussite

TG98AC2: Aggregate of very well defined Dioptase crystals, a lot of them doubly terminated, very bright and on matrix, with twinned, colorless and completely clear Cerussite crystals.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1975)

Specimen size: 6.5 × 4.2 × 2.1 cm = 2.6” × 1.7” × 0.8”

Main crystal size: 0.6 × 0.3 cm = 0.2” × 0.1”

With handwritten label from the Desmond Sacco Collection




Dioptase with Cerussite. Dioptase with Cerussite.
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Calcite with Dioptase
Calcite with Dioptase.

MA66V0: Group on matrix of rhombohedral crystals of Calcite, with sharp faces and edges and with clear geometrical color zoning due to the inclusion of small crystals of Dioptase that also appear as “window” growths formed on the faces of the Calcite crystals.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1970-1985)

Specimen size: 3.4 × 3.2 × 2.6 cm = 1.3” × 1.3” × 1.0”

Main crystal size: 1.1 × 1.1 cm = 0.4” × 0.4”

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long UV



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Dioptase with Calcite

TF50AC2: Small crystals, very bright, formed by the prism and acute rhombohedral terminations. They selectively occupy the surfaces of some of the faces of the white Calcite rhombohedrons on the matrix.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (±1975)

Specimen size: 6.2 × 5.9 × 2.9 cm = 2.4” × 2.3” × 1.1”

Main crystal size: 0.3 × 0.2 cm = 0.1” × 0.1”

Fluorescent short UV

With handwritten label from the Desmond Sacco Collection




Dioptase with Calcite. Dioptase with Calcite.
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Calcite
Calcite.

To see a larger 3D image please
click here or on the image

MX16W1: Group of translucent and very bright crystals that combine the forms of a quite flattened rhombohedron and a very short prism. This combination creates an unexpected and curious shape, quite similar to a pyritohedron. The sample is from the Desmond Sacco collection, whose label we'll send to the buyer.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia (1970-1985)

Specimen size: 3.4 × 3.4 × 2.2 cm = 1.3” × 1.3” × 0.9”

Main crystal size: 1.5 × 1 cm = 0.6” × 0.4”

Fluorescence short UV & minor fluorescence long UV

Former collection of Desmond Sacco



Order
Calcite

TX16R0: Parallel growth of beveled rhombohedral crystals with very well defined faces and edges and having different phases of crystallization underlined by different degrees of transparency.
N'Chwaning II Mine, N'Chwaning mining area, Kuruman, Kalahari manganese field (KMF), Northern Cape Province  South Africa

Specimen size: 4.7 × 3.1 × 3.1 cm = 1.9” × 1.2” × 1.2”

Main crystal size: 3.1 × 1.8 cm = 1.2” × 0.7”

Fluorescent short UV

Former collection of Desmond Sacco




Calcite. Front
Front
Calcite. Top
Top
Order
Mimetite with Cuprite and Calcite
Mimetite with Cuprite and Calcite. Mimetite with Cuprite and Calcite.

TB66Q6: White laminar crystals of Mimetite of hexagonal shape with a Cuprite crystal with multiple growths and small crystals of Calcite, on matrix. We’ll send a copy of the analysis.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 3.9 × 2.9 × 2.2 cm = 1.5” × 1.1” × 0.9”

Main crystal size: 0.5 × 0.4 cm = 0.2” × 0.2”

Calcite fluorescent long & short UV

Former collection of Desmond Sacco




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Mimetite with Cuprite and Calcite

TD26Q6: Yellow globular growths and flattened crystals of hexagonal shape on matrix, with a small group of cube-octahedral crystals of Cuprite and white crystals of Calcite. We’ll send a copy of the analysis.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 4.1 × 3.2 × 2.9 cm = 1.6” × 1.3” × 1.1”

Main crystal size: 0.5 × 0.4 cm = 0.2” × 0.2”

Former collection of Desmond Sacco

Calcite fluorescent long & short UV




Mimetite with Cuprite and Calcite. Mimetite with Cuprite and Calcite.
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Azurite with Malachite
Azurite with Malachite. Front
Front
Azurite with Malachite. Rear
Rear

MG68R8: Azurite crystal, on small matrix, partially doubly terminated and with sharp, very well defined faces and edges and having zones partially pseudomorphed by Malachite with a silky luster.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 4.3 × 2.2 × 2 cm = 1.7” × 0.9” × 0.8”

With handwritten label from the Desmond Sacco Collection




Sold
Malachite after Azurite

TX96Q3: A growth of two divergent crystals, one of them doubly terminated, with very well defined faces and edges, pseudomorphic after Azurite and with surface silky fibrous recrystallizations.
Tsumeb Mine, Tsumeb, Otjikoto Region  Namibia

Specimen size: 2.7 × 1.8 × 1.6 cm = 1.1” × 0.7” × 0.6”

Main crystal size: 2.7 × 1.2 cm = 1.1” × 0.5”

Former collection of Desmond Sacco




Malachite after Azurite. Front
Front
Malachite after Azurite. Side
Side
Order


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