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Bournonite On Siderite

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CLB612757

Bournonite On Siderite

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Description
Locality: 
Machacamarca Mine, Machacamarca, Saavedra Province, Potosi Department, Bolivia
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 3.7 × 2.5 cm
Largest Crystal: 
1.20cm
Description

A 1.2 cm big, lead-gray bournonite crystal on very good greenish brown, flaky siderite crystals.

A bit of old, healed damage under the bourn onite crystals. Otherwise in very good condition and still a beauty.

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

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

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