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Acanthite On Chalcopyrite Psm Acanthite

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PDM871166

Acanthite On Chalcopyrite Psm Acanthite

Description Tabs

Description
Locality: 
San Juan de Rayas Mine, Guanajuato, Guanajuato Municipality, Guerrero, Mexico
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.8 × 2.3 × 1.3 cm
Description

Beautiful arborescent cluster of flattened, elongate acanthite crystals with hoppered faces, that are partially replaced at the surface by lustrous microcrystalline chalcopyrite. The aggregate is overgrown by secondary, very bright, dark grey pseudo-cubic crystals of acanthite that are aerially exposed off this gorgeous arborescent formation. In perfect condition, it is almost a floater specimen.

I sent this for analyses because it was labelled as acanthite & polybasite, but no polybasite has been found. Classic Mexican locality.

Ex René Virlet collection.

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

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