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Marcasite

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PDM652979

Marcasite

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Description
Locality: 
Cap Blanc-Nez, Pas-de-Calais, Hauts-de-France, France
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.7 × 4.5 × 4 cm
Description

A rounded group of marcasite richly covered with two types of crystal combinations: the core is formed by dull green-grey marcasite with net contact twins on {101}. They are overgrown by a second generation of marcasite crystals of intense metallic lustre and good developed fourling twins on {101}. This two combinations are uncommon in the locality.

Found 1986 by Alain Maret.

Mineral Data
What's on the rock

Marcasite

Formula: 
FeS2
Strunz: 
2.EB.10a
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 6.5

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