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Bournonite

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SCH75970

Bournonite

Description Tabs

Description
Locality: 
Zacatecas, Zacatecas, Mexico
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.3 × 7 × 2.5 cm
Description

Superb plate completely covered with excellent 1 cm bournonite crystals intermixed with a small amount of well-crystallized pyrite. The bournonites have striated faces with a silky to mirror-like metallic luster, and the terminations show the same variation in luster. You can see the development of bournonite’s classic cogwheel habit. This is a superb Mexican bournonite specimen. It is old, fine, and large - with also large crystals for the locale.

 

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

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