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Bournonite & Galena With Siderite On Quartz

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CLB159352

Bournonite & Galena With Siderite On Quartz

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Classic Locality

Description Tabs

Description
Locality: 
Georg Mine, Willroth, Altenkirchen, Rhineland-Palatinate, Germany
Size Range: 
Cabinet (10-18 cm)
Size: 
12.2 × 8.1 × 4.2 cm
Description

The bournonite crystals from the Georg mine are among the best worldwide. This specimen hosts several very good ones up to 0.5 cm. The biggest one is model-shaped and really outstanding. Besides about two dozen galena crystals built some very nice groups togeter with platy siderite on a quartz/siderite matrix.

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

Galena

Formula: 
PbS
Strunz: 
2.CD.10
Crystal System: 
Isometric
Hardness: 
2.5
Colour: 
Lead-grey
Streak: 
Lead-grey

Siderite

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

Quartz

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

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