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Sturmanite & Braunite

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SLN185898

Sturmanite & Braunite

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Size Range: 
Small miniature (3-4.5 cm)
Size: 
1.3 × 4.4 × 2.4 cm
Description

Beautiful piece of sturmanite in very bright gemmy yellow crystals with the classical hexagonal form on black braunite crystals

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

Braunite

Formula: 
Mn2+Mn3+6(SiO4)O8
Strunz: 
9.AG.05
Hardness: 
6.0 - 6.5
Streak: 
Black
Type Locality: 
Oehrenstock (Öhrenstock), Langewiesen, Ilmenau District, Thuringian Forest, Thuringia, Germany

Seller Information

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