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Calcite On Calcite With Manganite

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SMS1084314

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
6 × 8.2 × 3.4 cm
Weight: 
116.11gr
Description

The specimen has micro crystals of manganite mainly on the first generation deposit of calcite and then to a minimal degree on the 2nd and 3rd generation deposits of calcite. The three generations have distinct crystal forms. The oldest are modified trigonal form with the surface planes made up of small rhombic alignments. The 2nd generation calcite are trigonal crystal form with simple smooth surface planes. the 3rd form are elongate needles in tiny bunches that are sometimes aligned to their host 2nd generation crystal but also randomly are deposited onto the 1st generation base level calcite. The matrix is an ore body of ironstone and hematite. There is some contact on one corner.

Mineral Data
What's on the rock

Calcite

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

Manganite

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

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