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Arsenopyrite With Chalcopyrite

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QRI851286

Arsenopyrite With Chalcopyrite

Former collection Richard Williams (CH)
Classic Locality

Description Tabs

Description
Locality: 
Panasqueira Mines, Covilhã, Castelo Branco District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
13 × 7.8 × 6.2 cm
Weight: 
1 460.00gr
Description

Significant, fresh cabinet of brassy chalcopyrite crystals hosting over a dozen well-formed silvery arsenopyrite prisms. Both metallic species are very lustrous and fresh. Chalcopyrite peatures a rather stepped habitus with velvety texture, whereas arsenopyrite is textbook. Both species display growth patterns.
Associated, some very thin bladed siderite with the uncommon 'horsetooth' zoning, which is quite pleasant. Also some nice flaky muscovite is associated.

Some peripheral contacts on the chalcopyrite crystals, whereas the other species are mostly in good conditions, as depicted.

A rather old specimen (1988) from Panasqueira, very unusual to spot in this size and quality. It comes from the former collection Williams (UK).

Heavy. Enquire for regular (non-tracked) shipping costs before bidding.

Mineral Data
What's on the rock

Arsenopyrite

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

Chalcopyrite

Formula: 
CuFeS2
Strunz: 
2.CB.10a
Crystal System: 
Tetragonal
Hardness: 
3.5 - 4.0

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