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Mineral Specimens - page 20
The Desmond Sacco Collection

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Text: Carles Curto (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


Calcite
Calcite. Front
Front
Calcite. Top
Top

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




Order
Ilvaite with Calcite and Pyrite

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”

With handwritten label from the Desmond Sacco Collection

Calcite fluorescent long & short UV




Ilvaite with Calcite and Pyrite. Front
Front
Ilvaite with Calcite and Pyrite. Top
Top
Order
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
Quartz (variety prase) with Andradite

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




Quartz (variety prase) with Andradite. Front
Front
Quartz (variety prase) with Andradite. Rear
Rear
Order
Schorl with Quartz
Schorl with Quartz. 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




Order

Tsumeb

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”

With handwritten label from the Desmond Sacco Collection

Minor fluorescence short UV



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”

With handwritten label from the Desmond Sacco Collection

Minor fluorescence short UV



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
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.
Order
Dioptase with Calcite
Dioptase with Calcite. 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”

With handwritten label from the Desmond Sacco Collection

Fluorescent short UV




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”

Former collection of Desmond Sacco

Fluorescent short UV




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”

Former collection of Desmond Sacco

Calcite fluorescent long & short UV




Order
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

Kalahari Manganese Fields

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, upper levels, Kuruman, Kalahari manganese fields, Northern Cape  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.
Order
Calcite
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”

With handwritten label from the Desmond Sacco Collection

Fluorescent long & short UV



Order
Calcite

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”

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long UV



Calcite. Front
Front
Calcite. Side
Side
Order
Calcite with Hematite
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




Order


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