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Coloradoite & Sylvanite

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ESM1155370

Description Tabs

Description
Locality: 
Mayflower Prospect, Whitehall, Madison County, Montana, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1 × 1 cm
Description

Grey metallic coloradoite with silvery sylvanite on matrix

Mineral Data
What's on the rock

Coloradoite

Formula: 
HgTe
Strunz: 
2.CB.05a
Hardness: 
2.5 - 0.0
Type Locality: 
Keystone Mine, Magnolia District, Boulder Co., Colorado, USA

Sylvanite

Formula: 
(Au,Ag)2Te4
Strunz: 
2.EA.05
Crystal System: 
Monoclinic
Hardness: 
1.5 - 2.0
Type Locality: 
Baia de Arieş (Offenbánya), Alba Co., Romania