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Arsenopyrite Psm Pyrrhotite

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RMM548860

Arsenopyrite Psm Pyrrhotite

Pseudomorph

Description Tabs

Description
Locality: 
Double Rainbow Mine, Deadwood, Lawrence County, South Dakota, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2 × 1.7 cm
Description

Pyrrhotite crystals replaced by pyrite and arsenopyrite.

The core of the pseudomorphs is pyrite and the outside is arsenopyrite in orientated micro-crystals. Associated are black micro-sphalerite crystals.

Mineral Data
What's on the rock

Arsenopyrite

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

Pyrrhotite

Formula: 
Fe1-xS (x = 0 to 0.17)
Strunz: 
2.CC.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

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