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Chalcocite & Calcite

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TJM524386

Chalcocite & Calcite

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Description
Locality: 
White Pine Mine, White Pine, Ontonagon County, Michigan, United States of America
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 2.3 × 1 cm
Largest Crystal: 
1.50cm
Description

Calcocite crystals and massive chalcocite are the main feature of this pretty specimen. Also present are baryte, calcite, and malachite. It sits up nicely for display.

The larger striated calcocite "toe" measures 1.5 cm and a clear, chisel-point barite crystal rests on top. The calcocite "rear" is a plate of smaller crystals. Also present are numerous scalenohedral calcite crystals. Most calcite crystals are clear, some are stained malachite green, and the largest measures 1.5 cm. 

Mineral Data
What's on the rock

Chalcocite

Formula: 
Cu2S
Strunz: 
2.BA.05
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0

Calcite

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

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