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Manganite With Dolomite

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QRI845124

Manganite With Dolomite

Former collection Christian Mavris
Classic Locality

Description Tabs

Description
Locality: 
Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
11.2 × 6.5 × 3 cm
Weight: 
101.00gr
Description

This is not a specimen you see everyday...

Hundreds of jet black, lustrous manganite crystals populate both sides of this rather thin creamy dolomite slice. One side is literally fully covered with manganite crystals epimorphed by fine sugary dolomite crystals. The other side is given by cauliform, saddle-shaped dolomite curves which nest manganite in the concave areas. Picking the front and back side of this specimen is pretty hard!

Honestly, this is the first time I see this kind of specimen, and I liked it immediately. The specimen is in my collection since a few years and it comes with a former Kristalle/Crystal Classics label.

Mineral Data
What's on the rock

Manganite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.15
Hardness: 
4.0
Type Locality: 
Manganese deposit, Ilfeld, Nordhausen, Harz, Thuringia, Germany

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

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