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Cockscomb Marcasite & Calcite

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CLB112521

Cockscomb Marcasite & Calcite

ex coll. Wittig
Classic Locality

Description Tabs

Description
Locality: 
Kuhlenberg Quarry, Silbach, Winterberg, Arnsberg, North Rhine - Westphalia, Germany
Size Range: 
Cabinet (10-18 cm)
Size: 
10.3 × 6 × 5.7 cm
Description

Very fine and rich specimen with dozens of excellent cockscomb crystals of marcasite on matrix. The marcasite crystals are covered with tiny calcite crystals. If you want to see the pure cockscomb shapes, you can carefully dissolve the calcite with thin acetic acid.

Mineral Data
What's on the rock

Marcasite

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

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

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