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Epitaxial Calcite On Calcite With Hausmannite

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SMS1084254

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 6.5 × 1.1 cm
Weight: 
24.82gr
Description

A thin sedimentary layer of iron stone matrix with tiny manganite crystals underneath and hausmannite crystals on top. The hausmannite is deposited of two generations of calcite. Calcite rhombic crystals are overgrown by small epitaxial scalene crystals of white calcite. The white on black is a very attractive colour combination.

Mineral Data
What's on the rock

Calcite

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

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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Start 23 Nov 18:00
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Shipping Information

Postage Area Price
Europe up to 500 grams
$12
Europe up to 1 kilogram
$16
United States up to 500 grams
$14
United States up to 1 kilogram
$18
Rest of world up to 500 grams
$14
Rest of world up to 1 kilogram
$18

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