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Uchucchacuaite Keutschite & Proustite

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BCK737273

Uchucchacuaite Keutschite & Proustite

Frank Keutsch collection
Type Locality

Description Tabs

Description
Locality: 
Uchucchacua Mine, Oyon Province, Lima Department, Peru
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 1.1 × 2.1 cm
Description

You are bidding on a small but exceptional sample from the Dr. Frank Keutsch personal collection. The small matrix hosts exceptional, rich striated black uchucchacuaite crystals on both sides of the matrix with abundant proustite crystals on which have grown tiny golden twinned crystals of extremely rare keutschite. All species analyzed by Dr. Keutsch and the specimen bears his signature green mark where samples were taken for analysis. Extremely rare and falls in best of species for uchucchacuaite! Much more beautiful than my poor photos indicate as well. 

Mineral Data
What's on the rock

Uchucchacuaite

Formula: 
AgMnPb3Sb5S12
Strunz: 
2.JB.40a
Crystal System: 
Orthorhombic
Hardness: 
3.5
Colour: 
Grey
Type Locality: 
Uchucchacua Mine, Oyon Province, Lima Department, Peru

Keutschite

Formula: 
Cu2AgAsS4
Hardness: 
0.0
Type Locality: 
Uchucchacua Mine, Oyon Province, Lima Department, Peru

Proustite

Formula: 
Ag3AsS3
Strunz: 
2.GA.05
Crystal System: 
Trigonal
Hardness: 
2.0 - 2.5

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