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Skutterudite With Arsenopyrite

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PDM876259

Skutterudite With Arsenopyrite

Analysed

Description Tabs

Description
Locality: 
Bouismas Mine, Zagora Province, Drâa-Tafilalet Region, Morocco
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
9.1 × 6.3 × 5.3 cm
Weight: 
580.00gr
Description

Heavy specimen, of more than 0.5 Kg, featuring highly lustrous, silver-grey and well-formed skutterudite crystals where the octahedron {111} is dominant over the cube {100}. Smaller faces of rhombic dodecahedron {101} truncate the cuboctahedron. The crystals are very aerial and the paragenesis is completed with extremely bright, silver white arsenopyrite (analysed) that form a thin crust on the skutterudite.

The specimen does also show the classical effect of tectonic pressure on these arsenides from the Bou Azer district. Pressure opened fractures in the skutterudite but not in the silicate-rich matrix, that react more ductile.

It is from the famous finds of July-August 2009.

Mineral Data
What's on the rock

Skutterudite

Formula: 
CoAs3-x
Strunz: 
2.EC.05
Hardness: 
5.5 - 6.0
Streak: 
Black
Type Locality: 
Skuterud Mines (Skutterud Mines; Modum Cobalt Mines), Modum, Buskerud, Norway

Arsenopyrite

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

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