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Acanthite Pyrargyrite & Polybasite

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SCH217522

Acanthite Pyrargyrite & Polybasite

Description Tabs

Description
Locality: 
Guanajuato, Guanajuato Municipality, Guanajuato, Mexico
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.2 × 2.8 × 1.9 cm
Description

Sparkly, sharp, metallic acanthite pseudomorphs after pyrargyrite crystals in vuggy, jackstraw style form a very rich and fine specimen from the famous mines at Guanajuato, Mexico. Many of the pseudos have hoppered terminations.  There are many thin, pseudohexagonal pseudomorphs after polybasite at the back as well. Minor chalcopyrite is present.

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

Pyrargyrite

Formula: 
Ag3SbS3
Strunz: 
2.GA.05
Crystal System: 
Trigonal - Ditrigonal Pyramidal
Hardness: 
2.5

Polybasite

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

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