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Cadmian Smithsonite On Native Copper

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KMF559731

Cadmian Smithsonite On Native Copper

Classic Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 3 × 2.5 cm
Description

I assume this to be a once off specimen after a long investigation and numerous discussions with tsumeb specialists. The build-up of this specimen is astonishing since the yellow cadmium rich smithsonite is present as one simple rhomb  positioned in isolation in the foreground on the face of the left hand stalactite- then a twin is set on the adjacent stalactite face in the center of the specimen.  

Behind the stalactites the smithsonite have intergrown and become a mass of yellow crystal faces all positioned one on top of the next revealing terminations stacked on top of each other wedged in between the pinnacles that allows the smithsonite no other option but to pack themselves vertically nestled within the group of stalactites. The upper end reveals smithsonite terminations that measure up to 1cm obviously given room to broaden out freely.

The stalactites are coated with white dolomite and native copper crystals and the smithsonite on the left front face are included with thin copper veinlets visible within the transparent yellow crystals.

The only imperfection that I can find is that some stalactite terminations are cleaved cleanly off- this specimen is otherwise damage free.

 

 

Mineral Data
What's on the rock

Cadmian Smithsonite

Variety Of: 

Smithsonite

Formula: 
ZnCO3
Strunz: 
5.AB.05
Hardness: 
4.0 - 4.5

Copper

Formula: 
Cu
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0

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