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Stephanite On Polybasite

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PJM95743

Stephanite On Polybasite

Description Tabs

Description
Locality: 
Veta Grande Mine, Vetagrande Municipality, Zacatecas, Mexico
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 2.1 × 1.1 cm
Description

A floater group of the rare sulphosalt mineral  polybasite has formed bladed crystals to 2.1cm across. These in turn have been  covered with a veneer of pyrite crystals on to which clusters of metallic gunmetal grey stephanite crystals have been deposited.

Mineral Data
What's on the rock

Stephanite

Formula: 
Ag5SbS4
Strunz: 
2.GB.10
Crystal System: 
Orthorhombic - Pyramidal
Hardness: 
2.0 - 2.5
Type Locality: 
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
Earthstones Australia

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