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Sturmanite With Manganite

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SMS1089071

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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: 
5.6 × 4.3 × 2.1 cm
Weight: 
118.75gr
Description

The specimen has a deposit of amber yellow sturmanite on a shelf of host rock. Disc shaped crystals of sturmanite, partly gemmy with an opaque core cover the matrix. The sturmanite crystals are in association with sphenoidal manganite of crystals up to 0.5cm. Some of the sturmanite are not complete.

Mineral Data
What's on the rock

Sturmanite

Formula: 
Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12·25H2O
Strunz: 
7.DG.15
Crystal System: 
Trigonal
Hardness: 
2.5
Type Locality: 
Black Rock Mine, Black Rock, Kalahari manganese field, Northern Cape Province, South Africa

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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$12
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$16
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$14
United States up to 1 kilogram
$18
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$14
Rest of world up to 1 kilogram
$18
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