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Bournonite & Chalcopyrite On Siderite

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CLB629094

Bournonite & Chalcopyrite On Siderite

Classic Locality

Description Tabs

Description
Locality: 
Georg Mine, Willroth, Altenkirchen, Rhineland-Palatinate, Germany
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
10 × 7.2 × 3.7 cm
Description

Some towering, shiny golden chalcopyrite crystal groups (polycrystalline-twinned) with lots of dull gray bournonite crystals on siderite. Nice, glossy brown siderite crystals on the back.

Very rich in bournonite. One ding in the middle.

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

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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