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Olmiite Calcite & Oyelite

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SCH36516

Olmiite Calcite & Oyelite

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Description
Locality: 
NChwaning II Mine, Kuruman, North Cape Province, South Africa
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 2.3 × 2.3 cm
Description

A superb miniature with a sharp lustrous blocky olmiite crystal set on a well-trimmed matrix covered by tiny gemmy colorless calcite crystals and white acicular oyelite. The olmiite has an exceptional definition and a singular elegance!

Mineral Data
What's on the rock

Olmiite

Formula: 
CaMn2+[SiO3(OH)](OH)
Strunz: 
9.AF.90
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa...

Calcite

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

Oyelite

Formula: 
Ca10Si8B2O29·12.5H2O
Strunz: 
9.HA.80
Hardness: 
5.0
Type Locality: 
Fuka mine, Fuka, Bicchu-cho (Bitchu-cho), Takahashi City, Okayama Prefecture, Chugoku Region, Honshu Island, Japan

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$125
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