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Bournonite

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WND783065

Bournonite

Classic Locality

Description Tabs

Description
Locality: 
Quiruvilca Mine, Quiruvilca District, Santiago de Chuco Province, Libertad Department, Peru
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.2 × 4.2 × 4.9 cm
Largest Crystal: 
1.50cm
Description

This is a superb specimen, featuring many mirror bright and excellent defined crystals of  lead-sulfosalt bournonite as typical "cogwheels"  They are multifaced as well and they are showing a slightly iridescence on some prism faces. Most of the central crystals are untouched,  but not all are perfect. Regarding the brittleness of bournonite, the specimen is top.

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
Wendel Minerals

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