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Calcite & Hisingerite

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GND96832

Calcite & Hisingerite

Classic Locality

Description Tabs

Description
Locality: 
North Mine, Broken Hill, Yancowinna County, New South Wales, Australia
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 5.2 × 2.2 cm
Description

A very unusual calcite specimen that seems to be coloured a smoky brown by some type of manganese inclusions as well as being associated with the manganese mineral hisingerite ( also known as sturtite). The calcite seems to have also been partially etched and a secondary regrowth has then occured. No damage.

Mineral Data
What's on the rock

Calcite

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

Hisingerite

Formula: 
Fe3+2(Si2O5)(OH)4·2H2O
Strunz: 
9.ED.10
Crystal System: 
Monoclinic
Hardness: 
2.5 - 3.0
Type Locality: 
Riddarhyttan, Skinnskatteberg, Västmanland, Sweden
Gondwana Minerals