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Millerite & Dolomite

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PDM574520

Millerite & Dolomite

Description Tabs

Description
Locality: 
Kladno District, Central Bohemian Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 4.8 × 2.3 cm
Description

Lustrous brassy coloured needle-like millerite crystals distributed as three divergent radial aggregates scattered on white rhombohedral dolomite crystals. Tiny golden yellow and very lustrous chalcopyrite crystals are also present on the dolomite.

Uncommon material from the Johan Muizebelt collection, who bought a box with 14 specimens in 1993, but they were extracted between 1982-85.

Mineral Data
What's on the rock

Millerite

Formula: 
NiS
Strunz: 
2.CC.20
Crystal System: 
Trigonal
Hardness: 
3.0 - 3.5
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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