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Tsumeb Rare Mineral Specimens III

Friday, 27 November 2015 08:00 AM

A fresh load of rarities from Tsumeb!

Philipsbornite

with Arsentsumebite & Zincgartrellite - #41253
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbAl3(AsO4)(AsO3OH)(OH)6 
Availability
Sold
Size
2 x 1.5 x 1 cm - Thumbnail 
Tagged
arsenate  
Special Info
Type Locality 

Colorless crystals of pseudocubic Philipsbornite all over matrix with green Arsentsumebite (bright green) & light green Zincgartrellite.


Philipsbornite

Formula
PbAl3(AsO4)(AsO3OH)(OH)6 
Crystal System
Trigonal 
Crystal Habit
Massive, Earthy 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray green 
Class
Trigonal 
Fracture
Conchoidal 
Hardness
4.5 
Special Info
Type Locality

Pyromorphite

#41002
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Pb5(PO4)3Cl 
Availability
Sold
Size
8 x 5 x 6 cm - Sm Cabinet 
Tagged
phosphate  
Special Info
XRD Confirmed 

Tiny 1mm and less almost colorless with a ting of yellow/green Pyromorphite crystals. These were analyzed by XRD. 


Pyromorphite

Formula
Pb5(PO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Crystals short to long prismatic, acicular, often hoppered terminations, rarely tabular to equant; radiating to branching groups, tapering to a point. Commonly rounded, globular, reniform, botryoidal. 
Cleavage
On {1011}, interrupted 
Luster
Resinous to subadamantine 
Color
Dark grass-green, green, yellow, yellow-orange, reddish orange, yellow-brown, brown, tan, grayish, may be colorless 
Streak
White 
Geological Setting
A secondary mineral in the oxidized zone of lead deposits 
Class
Hexagonal, 6/m - Dipyramidal 
Fracture
Uneven to subconchoidal 
Hardness
3.5–4 
Special Info
XRD Confirmed

Renierite

#PD43272
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Availability
Sold
Size
2 x 2 x 2 cm - Thumbnail 
Tagged
copper  

Metallic mass of purplish bronzy Renierite (EDS).


Renierite

Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Twinning Common 
Cleavage
None, None, None 
Luster
Metallic 
Color
bronze yellow, pinkish brown 
Streak
blackish gray 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection
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Renierite

#43275
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Availability
Sold
Size
4.5 x 2 x 2 cm - Miniature 
Tagged
copper  
Special Info
EDS Confirmed 

Larger chunk of almost pure metallic purplish-bronze Renierite. EDS


Renierite

Formula
(Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Twinning Common 
Cleavage
None, None, None 
Luster
Metallic 
Color
bronze yellow, pinkish brown 
Streak
blackish gray 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
4-5 
Collection
Phillips Collection
Special Info
EDS Confirmed
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Rosasite

with Duftite - #DS43258
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CuZnCO3(OH)2 
Availability
Sold
Size
6 x 3.5 x 3 cm - Sm Cabinet 
Tagged
carbonate , copper  

Rich coverage of tiny, less than 1mm, spherulitic bluish green Rosasite clusters contrasted nicely on a reddish limonitic matrix. On the backside are hundreds of lime green, lustrous Duftite crystals.


Rosasite

Formula
CuZnCO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Spherical, Mammillary, Encrustations 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Silky 
Color
blue green, light blue, sky blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
Collection
Shultz Collection
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Rosasite

with Duftite - #BM43268
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CuZnCO3(OH)2 
Availability
Sold
Size
4.5 x 3 x 2.5 cm - Miniature 
Tagged
carbonate , copper  

A colorful specimen with bluish green Rosasite clusters with green, lustrous Duftite with Cerussite and white rhombic crystals of Calcite. Willemite may also be present. 


Rosasite

Formula
CuZnCO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Spherical, Mammillary, Encrustations 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Silky 
Color
blue green, light blue, sky blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
Collection
McConlogue Collection
Mineralpedia
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