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Bornite Pyrite & Quartz

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UVM800785

Bornite Pyrite & Quartz

Classic Locality

Description Tabs

Description
Locality: 
Steward Mine, Butte, Silver Bow County, Montana, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 3.6 × 1.6 cm
Description

Small crystals and crystalline crusts of bornite associated with and overgrowing larger pyrite crystals casting a beautiful iridescence over much of the pyrite.   

From the estate of noted California collector and dealer Charles Trantham.

Mineral Data
What's on the rock

Bornite

Formula: 
Cu5FeS4
Strunz: 
2.BA.15
Crystal System: 
Tetragonal
Hardness: 
3.0
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Pyrite

Formula: 
FeS2
Strunz: 
2.EB.05a
Crystal System: 
Isometric
Hardness: 
6.0 - 6.5

Quartz

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

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