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Bournonite Arsenopyrite & Quartz

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SCH548856

Bournonite Arsenopyrite & Quartz

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Description
Locality: 
Milpo Mine, Cerro de Pasco, Pasco Department, Peru
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 3.3 × 2.8 cm
Description

Very lustrous bournonite crystals with gunmetal luster associated with slender lustrous arsenopyrite crystals. Quartz is present as adding contrast.

The brightness of the crystal was not captured in the photos. In wonderful condition, the front is pristine, the back shows a bright cogwheel and a damage crystal.

Quite exceptional for this deposit.

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

Arsenopyrite

Formula: 
FeAsS
Strunz: 
2.EB.20
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White
schani

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