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Defernite On Hausmannite

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KGM1060495

Defernite On Hausmannite

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Description
Locality: 
Kombat Mine, Grootfontein, Otjozondjupa Region, Namibia
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.8 × 4.7 × 4.1 cm
Description

A wonderful combination specimen of Defernite on Hausmannite from Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region in Namibia. The specimen consists of numerous, opaque Defernite blades displaying a waxy luster and a rose-brown coloration, that are suspended in a matrix of microcrystalline Hausmannite with a shiny, metallic luster and a silver-black coloration. Defernite is found only in two localities in the world, so it’s a very rare mineral.

The specimen is in excellent condition.

Mineral Data
What's on the rock

Defernite

Formula: 
Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
Strunz: 
5.BA.25
Crystal System: 
Orthorhombic
Hardness: 
3.0
Type Locality: 
Güneyce-Ikizdere, Rize Province, Black Sea Region, Turkey

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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