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Rare Tsumeb Mineral Specimens I

Wednesday, 31 July 2013 03:00 PM

Welcome to our Special Edition "Tsumeb I". Tsumeb II, will be announced later this year. Tsumeb is the most diverse mineral locality on Earth. An underground mine located in Namibia, Tsumeb was not only a great ore body but by the late 1960's captivated the mineral collecting world. Spectacular cabinet specimens of Azurite, Cerussite, Mimetite, Bayldonite, Adamite, and Wulfenite were found at Tsumeb. Extremely rare minerals also occur at Tsumeb. This includes 70 type locality species from a list of over 280 valid IMA minerals.

Adamite

(cuprian) - #PD36467
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Zn2AsO4(OH) 
Availability
Sold
Size
5 x 4 x 2 cm - Miniature 
Tagged
arsenate  

Deep emerald green crystals to 1mm sprinkled evenly across a dark green carpet of finely acicular Olivenite.


Adamite

Formula
Zn2AsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Druse, Encrustations 
Cleavage
One Good 
Luster
Vitreous - Resinous 
Color
yellow, green, violet, pink, yellowish green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Phillips Collection
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Adamite

(cuprian) - #PD36489
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Zn2AsO4(OH) 
Availability
Sold
Size
3 x 3 x 1.5 cm - Thumbnail 
Tagged
arsenate  

Deep green "cuproadamite" crystals most likely fro the 30 level of the second oxidation zone. Adamite from this level, like this specimen, contains the highes copper content. These Adamites are considered some of the finest from Tsumeb and are increasingly harder and harder to obtain. This specimen has 4-5mm crystals and is an excellent piece.


Adamite

Formula
Zn2AsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Druse, Encrustations 
Cleavage
One Good 
Luster
Vitreous - Resinous 
Color
yellow, green, violet, pink, yellowish green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Phillips Collection
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Agardite-(Ce)

#35151
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu2+6Ce(AsO4)3(OH)6·3H2
Availability
Sold
Size
Chip < 1cm 
Tagged
arsenate , copper  

A small, but rare, specimen of green cerium Agardite in divergent acicular sprays to about 1mm. Formed in the thrird oxidation zone. Gebhard label, originally labeled as "GS16". Undoubtedly Gebhard's study material.


Agardite-(Ce)

Formula
Cu2+6Ce(AsO4)3(OH)6·3H2
Crystal System
Hexagonal 
Crystal Habit
Acicular 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
yellow green 
Streak
greenish white 
Class
Hexagonal - Dipyramidal 
Fracture
Conchoidal 
Hardness

Anglesite

#PD36481
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbSO4 
Availability
Sold
Size
5 x 5 x 4 cm - Miniature 

Wedge shaped crystals of Anglesite to 2cm with a white crust and clear centers.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Phillips Collection
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Aragonite

var. nicholsonite - #PD36480
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CaCO3 
Availability
Sold
Size
5.5 x 4 x 2.5 cm - Sm Cabinet 
Tagged
carbonate  

A miniature size specimen of "nicholsinite", the zinc-bearing variety of Aragonite with characteristic pseudohexagonal dipyramidal crystals with short prism faces and pinacoids. The crystals average 7-8mm and the largest is 1cm. The matrix looks to be a combination of Calcite and Siderite or Dolomite.


Aragonite

Formula
CaCO3 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Columnar, Fibrous 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, gray, yellowish white, reddish white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness
3.5-4 
Collection
Phillips Collection
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Azurite

Beudantite and Malachite - #PD34834
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu3(CO3)2(OH)2 
Availability
Sold
Size
6 x 3.5 x 1 cm - Sm Cabinet 
Tagged
carbonate , copper  

A spectacular combination specimen of Thick tabular Azurite partially pseudomorphed by Malachite. The blue color of the Azurite is stunning, especially in person. Along the edges the blue color takes on a certain vividness and seems to penetrate from the subsurface. This must be the same "internal blue reflections of electric blue color" that Georg Gebhard described in his book "Tsumeb II" on page 304.  Although the crystal looks partial it is actually a floater and rehealed with Calcite and coated with excellent pseudoctahedral light brown Beudantite crystals to 1mm.


Azurite

Formula
Cu3(CO3)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Prismatic, Stalactitic 
Cleavage
Perfect, Fair, None 
Luster
Vitreous (Glassy) 
Color
azure blue, blue, light blue, dark blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Phillips Collection
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