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Calcite With Marcasite

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QRI750997

Calcite With Marcasite

Classic Locality

Description Tabs

Description
Locality: 
Háje, Příbram, Central Bohemian Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.7 × 3 × 2.2 cm
Largest Crystal: 
2.00cm
Weight: 
25.00gr
Description

Dark scalenohedral crystals of calcite up to 2 cm each, with some faces hoppered and partly filled with a dusting of sulphide crystals (presumibly pyrite). Sulphides are rather fresh, with a slight iridescence, and calcite has a mid lustre on the smooth, non-hoppered faces, which add a certain aesthetic touch to this miniature.
Uncommonly spotted on the market, I recently acquired this specimen from an Italian collector. 

Previous labels supplied (not photographed)
Mineral Data
What's on the rock

Calcite

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

Marcasite

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

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