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Sturmanite Over Charlesite With Hematite

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Sturmanite Over Charlesite With Hematite

Rare Mineral

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Combination
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.3 × 3 × 2 cm
Largest Crystal: 
4.80cm
Weight: 
21.00gr
Description

Sturmanite over charlesite with hematite.  A very fine specimen...

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

Charlesite

Formula: 
Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12·26H2O
Strunz: 
7.DG.15
Hardness: 
2.5
Streak: 
White
Type Locality: 
Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA

Hematite

Formula: 
Fe2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0