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Ilvaite Arsenopyrite Magnetite & Pyrrhotite

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RFJ1032930

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Description
Locality: 
Kitabira mine, Mine City, Yamaguchi Prefecture, Honshu Island, Japan
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.1 × 5.8 × 4.7 cm
Description

This is a rarly seen combination of Arsenopyrite crystals, Ilvaite and tiny Magnetite crystals on a matrix of Pyrrhotite and Magnetite interesting combination, the Ilvaite crystals are not well defined - still an interesting specimen. The mine was in the 1950s famous for secondary minerals, it is not well known that the mine produced very interesting primary minerals.

Mineral Data
What's on the rock

Ilvaite

Formula: 
CaFe2+2Fe3+(Si2O7)O(OH)
Strunz: 
9.BE.07
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0
Type Locality: 
Torre di Rio - Santa Filomena area (Monte della Torre), Rio Marina, Elba Island, Livorno Province, Tuscany, Italy

Arsenopyrite

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

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black

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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