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Tennantite & Bornite

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Tennantite & Bornite

Description Tabs

Description
Locality: 
Tincroft Mine, Pool, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 6.5 × 3.5 cm
Description

Old time specimen which on one side is completely covered with bright steel grey tennantite crystals to 1 mm.The reverse side displays partly crystallized bornite with a few small altered chalcocite crystals.

Good display specimen.

Mineral Data
What's on the rock

Tennantite

Formula: 
Cu6[Cu4(Fe,Zn)2]As4S13
Strunz: 
2.GB.05
Crystal System: 
Isometric
Hardness: 
3.0 - 4.5
Type Locality: 
Cornwall, England, UK

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