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0 item @ $0.00  

Tsumeb Rare Mineral Specimens III

Friday, 27 November 2015 08:00 AM

A fresh load of rarities from Tsumeb!

SOLD
Germanite - PD43274
Germanite - PD43274

Germanite

#PD43274
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu13Fe2Ge2S16 
Availability
Sold
Size
2 x 2 x 1.5 cm - Thumbnail 
Special Info
EDS Confirmed 

Analyzed mass of metallic purplish Germanite (EDS). Silvery fresh.


Germanite

Formula
Cu13Fe2Ge2S16 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
brown, red gray 
Streak
dark gray 
Class
Isometric - Hextetrahedral 
Fracture
Brittle 
Hardness
Collection
Phillips Collection
Special Info
EDS Confirmed
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Mimetite

with Copper - #DS43249
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Pb5(AsO4)3Cl 
Availability
Sold
Size
5.5 x 4 x 3.5 cm - Sm Cabinet 
Tagged
arsenate  

A simple specimen with honey colored, hexagonal, prismatic crystals of Mimetite to about 3mm in clusters with tiny, less than 1mm copper crystals displaying both cubic and cubo-octahedral forms.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Shultz Collection
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Molybdofornacite

with Dioptase - #DS43251
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CuPb2MoO4AsO4(OH) 
Availability
Sold
Size
3.5 x 2.5 x 2 cm - Miniature 
Tagged
arsenate , copper  

Several 3-4mm pockets lined with vivid, neon green, long bladed crytsals of Molybdofornacite to about 0.4mm with a few micro Dioptase crystals. formerly of the John Innes collection 1978, as documented on the Pinch label. It is from the 30 level of the Tsumeb mine.


Molybdofornacite

Formula
CuPb2MoO4AsO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Pistolitic, Lath 
Cleavage
None, None, None 
Luster
Adamantine 
Color
light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2-3 
Collection
Shultz Collection

Mottramite

#DS43069
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbCuVO4(OH) 
Availability
Sold
Size
8.5 x 6.5 x 2.5 cm - Sm Cabinet 
Tagged
copper , vanadium  

Dark green plumose Mottramite. 


Mottramite

Formula
PbCuVO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Plumose, Radial, Encrustations 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
brown, brown red, brownish black, green, dark green 
Streak
light brownish green 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Shultz Collection

Olivenite

with Cornwallite(?) - #PD43267
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu2AsO4(OH) 
Availability
Sold
Size
5.5 x 5 x 3 cm - Sm Cabinet 
Tagged
arsenate , copper  

Outstanding specimen of Olivenite with deep green bladed crystals to 2mm with abundant spherules of what looks to be Cornwallite. Cornwallite is typically associated with Olivenite at other localities, but rare and unverified at Tsumeb. So, this would have to be tested out. Nonetheless it is a head banging specimen under the scope. But don't hurt yourself.


Olivenite

Formula
Cu2AsO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Acicular to Prismatic, Radial, Fibrous 
Cleavage
Indistinct, Indistinct, Indistinct 
Luster
Vitreous - Greasy 
Color
olive green, yellowish brown, dirty white, blackish green, liver brown 
Streak
yellowish green 
Geological Setting
In oxidized zone of copper and arsenate rich deposits.  
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
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Otavite

#PD43270
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CdCO3 
Availability
Sold
Size
0.4 x 0.3 x 0.1 cm - Thumbnail 
Tagged
carbonate  
Special Info
Type Locality 
Special Info
EDS Confirmed 

A small 4x3x1mm specimen with tested (EDS) pearly white, rhombic crystals and crusts of Otavite.


Otavite

Formula
CdCO3 
Crystal System
Trigonal 
Crystal Habit
Encrustations, Euhedral Crystals 
Cleavage
Perfect, Perfect, Perfect 
Luster
Adamantine - Pearly 
Color
yellow brown, white, reddish, reddish white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Special Info
Type Locality
Special Info
EDS Confirmed
Mineralpedia
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