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Tennantite Chalcocite & Bornite

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GF3421

Description Tabs

Description
Locality: 
Wheal Jewel, Gwennap, Cornwall, United Kingdom
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 4.7 × 4 cm
Description

Highly iridescent massive bornite matrix with cavities to one end lined with lustrous tiny metallic grey crystals of tennantite.

Some of these have clustered into spherical growths.

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

Chalcocite

Formula: 
Cu2S
Strunz: 
2.BA.05
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0

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
Provenance

George Fletcher Collection

Tue, 2015-09-29 15:51 -- admin
Some History
Name: 
George Fletcher
Dates: 
d.2023
Type: 
Collector/Collection
Specialisms: 
Derbyshire/Midlands, Weardale, United Kingdom
About

George Fletcher lived, worked and collected a lot in the Derbyshire, Peak distrct however as a prolific collector travelled all over the...

Seller Information

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