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Acanthite With Marcasite & Quartz On Acanthite Psm Polybasite

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PCZ222208

Acanthite With Marcasite & Quartz On Acanthite Psm Polybasite

Description Tabs

Description
Locality: 
San Juan de Rayas Mine, Guanajuato, Guanajuato Municipality, Guerrero, Mexico
Class: 
Crystal Group/Cluster
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.3 × 1.5 cm
Description

For about 15 years now my personal collection has had a main focus on Mexican minerals therefore I can vouch for the fact that this specimen is a very unusual, fascinating and rare combination. A silver sulfide specimen showing acanthite with marcasite on acanthite after polybasite. Small white quartz points add a nice contrast.

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

Marcasite

Formula: 
FeS2
Strunz: 
2.EB.10a
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 6.5

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Polybasite

Formula: 
[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]
Strunz: 
2.GB.15
Crystal System: 
Monoclinic - Prismatic
Hardness: 
2.5 - 3.0
Streak: 
black
Peter Crozier Minerals