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Acanthite & Chalcopyrite

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ESM766953

Acanthite & Chalcopyrite

Description Tabs

Description
Locality: 
Zacatecas, Zacatecas Municipality, Zacatecas, Mexico
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.5 × 1.2 cm
Description

A cluster of rounded acanthite crystals coated  with golden chalcopyrite (ex. Mildred "Midge" Leahy coll.)

Mineral Data
What's on the rock

Acanthite

Formula: 
Ag2S
Strunz: 
2.BA.35
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.0 - 2.5
Streak: 
lead grey
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0