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Bournonite

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CR946968

Bournonite

Description Tabs

Description
Locality: 
Machacamarca Mine, Machacamarca, Saavedra Province, Potosi Department, Bolivia
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.3 × 3.2 × 2.7 cm
Largest Crystal: 
1.40cm
Description

For overall quality, this is a very good Bournonite from Bolivia.

There was a find of this relatively rare lead copper antimony sulfosalt about 6 years ago at Machacamarca, and this piece is one of the better quality pieces found, especially for a crystal this size.

This piece features an attractive, sharp, doubly-terminated, tabular, metallic, silvery-grey color "cogwheel"-shaped crystals on matrix. The  Bournonites are complete on all sides and are simply one of the most attractive specimens of this material that I’ve seen recently.

This material was found in very small quantities from Bolivia in such fine cogwheels.

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