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Manganoan Calcite On Hausmannite

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Manganoan Calcite On Hausmannite

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.6 × 3.5 × 3.1 cm
Weight: 
17.33gr
Description

The specimen has an intergrown formation of botryoidal manganoan calcite as well as small scalene crystals of calcite on black metallic hausmannite. Very light pink rounded forms of calcite have formed a continuous growth across the matrix surface. The hausmannite have a very simple metallic black lustrous pyramid forms.

Mineral Data
What's on the rock

Manganoan Calcite

Variety Of: 

Calcite

Formula: 
CaCO3
Strunz: 
5.AB.05
Hardness: 
3.0
Formula: 
(Ca,Mn)CO3
Hardness: 
0.0

Hausmannite

Formula: 
Mn2+Mn3+2O4
Strunz: 
4.BB.10
Hardness: 
5.5
Type Locality: 
Oehrenstock (Öhrenstock), Langewiesen, Ilmenau District, Thuringian Forest, Thuringia, Germany

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