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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


Kalahari Manganese Fields

Sturmanite with Calcite
Sturmanite with Calcite. Front
Front
Sturmanite with Calcite. Rear
Rear
Sturmanite with Calcite. Top
Top

ME96W7: Crystal comprised of the hexagonal prism, a much flattened pyramid and the pinacoid. The crystal is notable for its intense yellow color. As usual when the identification is uncertain we will provide an analysis to the buyer of the specimen. In this case to prove that it is Sturmanite and not Ettringite.
The sample is with an autographed label from the Desmond Sacco collection that we'll send to the buyer.
N'Chwaning II Mine, Kuruman, Kalahari  South Africa

Specimen size: 2.5 × 1.5 × 1.3 cm = 1.0” × 0.6” × 0.5”

With handwritten label from the Desmond Sacco Collection


Sold
Sturmanite with Calcite

MC47W7: Crystal comprised of the hexagonal prism, a much flattened pyramid and the pinacoid. The crystal, with a small matrix of microcrystalline Calcite, is notable for its intense yellow color. As usual when the identification is uncertain we will provide an analysis to the buyer of the specimen. In this case to prove that it is Sturmanite and not Ettringite.
The sample is with an autographed label from the Desmond Sacco collection that we'll send to the buyer.
N'Chwaning II Mine, Kuruman, Kalahari  South Africa

Specimen size: 3 × 1.9 × 1.5 cm = 1.2” × 0.7” × 0.6”

Main crystal size: 2.9 × 1.3 cm = 1.1” × 0.5”

With handwritten label from the Desmond Sacco Collection


Sturmanite with Calcite. Front
Front
Sturmanite with Calcite. Rear
Rear
Sturmanite with Calcite. Top
Top
Sold
Sturmanite with Calcite
Sturmanite with Calcite. Front
Front
Sturmanite with Calcite. Rear
Rear
Sturmanite with Calcite. Top
Top

MD57W7: Crystal comprised of the hexagonal prism, a much flattened pyramid and the pinacoid. The crystal, with a small matrix of microcrystalline Calcite, is notable for its intense yellow color. As usual when the identification is uncertain we will provide an analysis to the buyer of the specimen. In this case to prove that it is Sturmanite and not Ettringite.
The sample is with an autographed label from the Desmond Sacco collection that we'll send to the buyer.
N'Chwaning II Mine, Kuruman, Kalahari  South Africa (1987)

Specimen size: 3.5 × 1.6 × 1.3 cm = 1.4” × 0.6” × 0.5”

Main crystal size: 3.5 × 1.4 cm = 1.4” × 0.6”

With handwritten label from the Desmond Sacco Collection


Sold
Sturmanite with Calcite

MA77W7: Isolated crystals, some of them doubly terminated, comprised of the hexagonal prism, a much flattened dipyramid and the pinacoid. The crystals, implanted on a matrix coated by microcrystalline Calcite, are notable for their intense and bright yellow color. As usual when the identification is uncertain we will provide an analysis to the buyer of the specimen. In this case to prove that it is Sturmanite and not Ettringite.
The sample is with an autographed label from the Desmond Sacco collection that we'll send to the buyer.
N'Chwaning II Mine, Kuruman, Kalahari  South Africa (1987)

Specimen size: 3.6 × 3 × 2.6 cm = 1.4” × 1.2” × 1.0”

Main crystal size: 1.3 × 0.9 cm = 0.5” × 0.4”

With handwritten label from the Desmond Sacco Collection


Sturmanite with Calcite. Front
Front
Sturmanite with Calcite. Top
Top
Sold
Olmiite with Calcite
Olmiite with Calcite. 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  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

Order
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  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

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

TV98S1: Spheroidal groups and some single doubly terminated crystals of Olmiite, of clear cream color, with excellent luster and on matrix.
N'Chwaning II Mine, Kuruman, Kalahari  South Africa (2005)

Specimen size: 9.1 × 5.8 × 4.6 cm = 3.6” × 2.3” × 1.8”

Main crystal size: 1.2 × 0.5 cm = 0.5” × 0.2”

With handwritten label from the Desmond Sacco Collection

Fluorescence 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  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

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, Kuruman, Kalahari  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

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, Kuruman, Kalahari  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
Hematite with Calcite and Celestine
Hematite with Calcite and Celestine. Front
Front
Hematite with Calcite and Celestine. Rear
Rear

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.
Black Rock Mine, Black Rock, Kalahari  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”


Sold
Hematite with Gaudefroyite

TJ93S1: Floater complex crystal of Hematite with very well defined faces and edges and an extraordinary luster, with very well developed crystals of black Gaudefroyite that have a considerable size for the species and are formed mainly by the prism and terminal pyramids.
Black Rock Mine, Black Rock, Kalahari  South Africa

Specimen size: 3.1 × 2.5 × 2 cm = 1.2” × 1.0” × 0.8”


Hematite with Gaudefroyite. Front
Front
Hematite with Gaudefroyite. Side
Side
Hematite with Gaudefroyite. Rear
Rear
Sold
Rhodochrosite with Gonyerite and Shigaite
Rhodochrosite with Gonyerite and Shigaite.
Rhodochrosite with Gonyerite and Shigaite. 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, Kuruman, Kalahari  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

Sold

Tsumeb

Mimetite

MA47V7: Irregular aggregate, on limonite matrix, of crystals formed by an elongated prism and a very shallow terminal dipyramid. Many of the crystals, which are bright with a very intense yellow color, are doubly terminated. The sample is from the Desmond Sacco collection whose label we’ll send to the buyer.
Tsumeb Mine, Tsumeb  Namibia (1980)

Specimen size: 7.8 × 6.2 × 3 cm = 3.1” × 2.4” × 1.2”

Main crystal size: 1.1 × 0.3 cm = 0.4” × 0.1”

With handwritten label from the Desmond Sacco Collection

Minor fluorescence long & short UV

Mimetite. Mimetite.
Sold
Smithsonite
Smithsonite.

TB13R0: Group of sharp flattened rhombohedral crystals of very uniform pink color on a very small matrix of granular Galena. The sample had been analyzed and we'll send a copy of the analysis to the buyer.
Tsumeb Mine, Tsumeb  Namibia

Specimen size: 2 × 1.8 × 1.7 cm = 0.8” × 0.7” × 0.7”

Main crystal size: 1.2 × 0.7 cm = 0.5” × 0.3”


Sold
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  Namibia

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


Smithsonite. Front
Front
Smithsonite. Rear
Rear
Order
Smithsonite
Smithsonite.

TQ96Q6: Isolated rhombohedral crystal, a very infrequent case in Tsumeb, with very well defined faces and edges, bright, with colored inclusions and very aerial on a metallic matrix coated by the same Smithsonite. We’ll send a copy of the analysis.
Tsumeb Mine, Tsumeb  Namibia

Specimen size: 2.2 × 1.4 × 1.5 cm = 0.9” × 0.6” × 0.6”

Main crystal size: 1.3 × 1.2 cm = 0.5” × 0.5”


Sold
Smithsonite with Cuprite and Malachite

TB66Q5: Group of Cuprite crystals with very well defined faces and edges. The crystals are partially pseudomorphed by Malachite, on a group of clear cream deformed crystals of Smithsonite of spheroidal aspect.
Tsumeb Mine, Tsumeb  Namibia

Specimen size: 5.2 × 3.4 × 2.2 cm = 2.0” × 1.3” × 0.9”

Minor fluorescence long & short UV

Smithsonite with Cuprite and Malachite. Smithsonite with Cuprite and Malachite.
Order
Cobaltoan Smithsonite
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  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

Order
Cobaltoan Smithsonite

MC49V0: Aggregate on matrix of rhombohedral crystals with sharp faces and edges. They are very bright, more transparent than usual, and they have a deep pink color corresponding to the cobaltoan variety of this species.
Tsumeb Mine, Tsumeb  Namibia (1970-1985)

Specimen size: 4.4 × 4 × 2.8 cm = 1.7” × 1.6” × 1.1”

Main crystal size: 1 × 0.9 cm = 0.4” × 0.4”

With handwritten label from the Desmond Sacco Collection


Cobaltoan Smithsonite. 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  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


Sold
Cuprian Smithsonite

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  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


Cuprian Smithsonite. Front
Front
Cuprian Smithsonite. Rear
Rear
Sold
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  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

Sold
Dioptase with Calcite

TC16S1: Group of very bright and translucent crystals of Dioptase, whose deep color especially enhances the lighting effect on the piece. With minor Calcite and on matrix.
Tsumeb Mine, Tsumeb  Namibia (±1985)

Specimen size: 5.9 × 4.4 × 4.4 cm = 2.3” × 1.7” × 1.7”

Main crystal size: 0.9 × 0.5 cm = 0.4” × 0.2”

With handwritten label from the Desmond Sacco Collection


Dioptase with Calcite. Dioptase with Calcite.
Sold
Calcite
Calcite.

MM76V7: Parallel aggregates of well-formed crystals composed of two rhombohedra, one of them clearly dominant. The crystals are bright, yellowish and between transparent and translucent. The sample is from the Desmond Sacco collection whose label we’ll send to the buyer.
Tsumeb Mine, Tsumeb  Namibia (1970-1985)

Specimen size: 3 × 2.9 × 3 cm = 1.2” × 1.1” × 1.2”

Main crystal size: 0.8 × 0.7 cm = 0.3” × 0.3”

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long 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, Kuruman, Kalahari  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


Calcite. Front
Front
Calcite. Top
Top
Order
Calcite with Duftite
Calcite with Duftite. Front
Front
Calcite with Duftite. Rear
Rear

TH26S1: Echeloned group of rhombohedral crystals that, selectively on the edges, are partially coated by small globular growths of green crystals of Duftite.
Tsumeb Mine, Tsumeb  Namibia (±1987)

Specimen size: 5.1 × 2.4 × 1.7 cm = 2.0” × 0.9” × 0.7”

Main crystal size: 1.4 × 1 cm = 0.6” × 0.4”

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long UV

Sold
Calcite

MZ27T7: Group of rhombohedral crystals with a curious nuance on their transparency and luster, very much clearer on the areas near the edges.
With a handwritten Sacco collection label, that we’ll send to the buyer.
Tsumeb Mine, Tsumeb  Namibia (1970-1985)

Specimen size: 7.6 × 6 × 1.8 cm = 3.0” × 2.4” × 0.7”

Main crystal size: 1.8 × 1.6 cm = 0.7” × 0.6”

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long UV

Calcite.
Order
Calcite
Calcite. Calcite.

MF68T7: Druse of polycrystalline rhombohedral crystals having a lenticular shape. They are very bright and have red phantom growths of Hematite inclusions.
With a handwritten Sacco collection label, that we’ll send to the buyer.
Tsumeb Mine, Tsumeb  Namibia (1970-1985)

Specimen size: 12.5 × 7 × 3.6 cm = 4.9” × 2.8” × 1.4”

With handwritten label from the Desmond Sacco Collection


Sold
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  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


Mimetite with Cuprite and Calcite. Mimetite with Cuprite and Calcite.
Order
Mimetite with Cuprite and Calcite
Mimetite with Cuprite and Calcite. 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  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”

Calcite fluorescent long & short UV


Sold
Mimetite with Galena

TD67Q5: Group of crystals of considerable length for the species, some of them doubly terminated, with vivid yellow color, translucent and very bright, formed by an elongated prism and the terminal faces of a pyramid.
Tsumeb Mine, Tsumeb  Namibia

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

Main crystal size: 2.4 × 0.3 cm = 0.9” × 0.1”


Mimetite with Galena.
Sold
Mimetite with Dolomite
Mimetite with Dolomite. Mimetite with Dolomite.

MF97R6: Parallel growths of flattened dipyramidal crystals of Mimetite of very well defined faces and edges, bright and of intense yellow color, on a matrix of small crystals of Dolomite.
Tsumeb Mine, Tsumeb  Namibia

Specimen size: 8.4 × 5.7 × 2.4 cm = 3.3” × 2.2” × 0.9”

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

With handwritten label from the Desmond Sacco Collection

Fluorescence short UV & low fluorescence long UV

Sold
Azurite with Malachite

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  Namibia

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

With handwritten label from the Desmond Sacco Collection


Azurite with Malachite. Front
Front
Azurite with Malachite. Rear
Rear
Sold
Malachite after Azurite
Malachite after Azurite. Front
Front
Malachite after Azurite. Side
Side

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  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”


Order
Malachite with Mimetite

TT16S5: Very well defined globular growths of Malachite that have a very intense grass-green color, with small aggregates of white crystals of Mimetite, a very unusual association, and small milky crystals of Smithsonite.
Tsumeb Mine, Tsumeb  Namibia

Specimen size: 6.3 × 5.2 × 2.9 cm = 2.5” × 2.0” × 1.1”

With handwritten label from the Desmond Sacco Collection

Mimetite minor fluorescence long & short UV

Malachite with Mimetite. Malachite with Mimetite.
Sold
Cerussite
Cerussite. Front
Front
Cerussite. Rear
Rear

TN27S1: Group of crystals forming multiple cyclic twins. They are clear translucent, very bright and on matrix.
Tsumeb Mine, Tsumeb  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

Order
Twinned Cerussite

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  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”

Minor fluorescence short UV


Twinned Cerussite. Front
Front
Twinned Cerussite. Side
Side
Sold
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  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


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