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Stephanite & Polybasite

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JYJ212910

Stephanite & Polybasite

Description Tabs

Description
Locality: 
St Andreasberg, Harz Mountains, Lower Saxony, Germany
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.8 × 1.5 cm
Description

Black metallic stephanite and platy polybasite on native arsenic.

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
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