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Bournonite Tetrahedrite & Chalcopyrite On Siderite

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CLB557997

Bournonite Tetrahedrite & Chalcopyrite On Siderite

ex collection Alex Franz
Classic Locality

Description Tabs

Description
Locality: 
Georg Mine, Willroth, Altenkirchen, Rhineland-Palatinate, Germany
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 4.5 × 3.8 cm
Description

Glossy black metallic bournonite and tetrahedrite crystals with golden chalcopyrite on brown, massy siderite and quartz.

Is labeled 'Pfannenberg, Siegerland' with a question mark. I'm pretty sure about Georg mine (99.9%).

Mineral Data
What's on the rock

Bournonite

Formula: 
PbCuSbS3
Strunz: 
2.GA.50
Hardness: 
2.5 - 3.0
Type Locality: 
Wheal Boys (Trewetha Mine; Old Trewetha Mine), Port Isaac, St Endellion, Wadebridge District, Cornwall, England, UK

Tetrahedrite

Formula: 
Cu6[Cu4(Fe,Zn)2]Sb4S13
Strunz: 
2.GB.05
Hardness: 
3.5 - 4.0

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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