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Acanthite & Silver

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RBM722304

Acanthite & Silver

Description Tabs

Description
Locality: 
Chañarcillo, Copiapó Province, Atacama Region, Chile
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.5 × 4.5 × 3 cm
Description

Very old sample, dating from more than 100 years ago in which it was collected. The main minerals are acantite, native silver and sphalerite, all on a calcite matrix.
 

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

Silver

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

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