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Calcite

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PDM671730

Calcite

Description Tabs

Description
Locality: 
Marquise, Pas-de-Calais, Hauts-de-France, France
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 1.8 × 1.6 cm
Description

Two calcite crystals, related by a contact twin on {021}, forming a "closed twin", known as "Pope's mitre". It has a red colour due to thin stains of iron hydroxides.

Ex. Michel Croichez specimen.

Mineral Data
What's on the rock

Calcite

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

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