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Polybasite & Proustite

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MEX159144

Polybasite & Proustite

ex Dr.Max Brocker, Sankt Augustin collection
With Antique Label

Description Tabs

Description
Locality: 
Yankee Boy Mine, Sneffels District, Ouray County, Colorado, United States of America
Size Range: 
Thumbnail (1-3cm)
Size: 
1.8 × 1.4 × 1.2 cm
Description

A nice specimen with few polybasite crystal groups and red proustite crystals.

Mineral Data
What's on the rock

Polybasite

Formula: 
[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Strunz: 
2.GB.15
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.5 - 3.0
Streak: 
black

Proustite

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