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Millerite Sphalerite & Calcite

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CLB173839

Millerite Sphalerite & Calcite

Classic Locality

Description Tabs

Description
Locality: 
Cessford Quarry, Biggsville, Henderson County, Illinois, United States of America
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2 × 1.2 cm
Description

A ball of acicular millerite crystals on calcite with two shiny black sphalerite crystals.

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

Sphalerite

Formula: 
ZnS
Strunz: 
2.CB.05a
Crystal System: 
Isometric
Hardness: 
3.5 - 4.0

Calcite

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

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