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Bournonite

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BMM741728

Bournonite

Description Tabs

Description
Locality: 
Viboras Mine, Machacamarca, Saavedra Province, Potosi Department, Bolivia
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.3 × 4 × 2.2 cm
Description

Large complex twinned bournonite crystal of 4.3 cm length. The piece consists of an attractive sharp, doubly terminated, striated, tabular, silvery-grey color crystal. The bournonite shows the classic striated outer edge, the result of multiple twinning. No significant damage to report - a small part on the backside was from the 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