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Polybasite & Acanthite

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CLB149168

Polybasite & Acanthite

Classic Locality

Description Tabs

Description
Locality: 
Valenciana Mine, Guanajuato, Guanajuato Municipality, Guanajuato, Mexico
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 1.8 × 1.8 cm
Description

This litle specimen shouldn't be underestimated. It practically consists to 90% of rather big polybasite crystals, with (possibly) some minor acanthite as base (originally identified as argentite but this is not known from the mine). I just had it prifessionally cleaned.

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

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

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