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Bournonite On Quartz

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MMM34819

Bournonite On Quartz

Description Tabs

Description
Locality: 
Herodsfoot Mine, Lanreath, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
3.5 × 5 × 2 cm
Description

A small but perfect 7 mm cogwheel crystal of bournonite nestling amongst siderite crystals which are covered in crystalline pyrite. There is also a 2 cm pseudo of quartz after barite.

Matrix is crystalline quartz with minor galena.

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

Quartz

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