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Pyrargyrite Pyrostilpnite & Polybasite

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CLB168218

Pyrargyrite Pyrostilpnite & Polybasite

Classic Locality

Description Tabs

Description
Locality: 
Fresnillo Mine, Fresnillo, Zacatecas, Mexico
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.2 × 3.4 × 2.1 cm
Description

Threre's certainly pyrargyrit on this specimen, little crystals and massive substance (cherry-red fracture faces). Also labeled with 'pyrostilpnite', which is a monoclinic dimorph of pyrargyrite (I'm not so sure about that). However, there are platy, metallic-black crystals in a vug, that look like polybasite to me.
I have no idea about the little brownish crystals.

Mineral Data
What's on the rock

Pyrargyrite

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

Pyrostilpnite

Formula: 
Ag3SbS3
Strunz: 
2.GA.10
Hardness: 
2.0
Type Locality: 
Churprinz Friedrich August Erbstolln Mine (Churprinz Mine; Kurprinz Mine), Großschirma, Freiberg District, Erzgebirge, Saxony, Germany

Polybasite

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

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