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Olmiite Oyelite & Calcite

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MGR784239

Olmiite Oyelite & Calcite

Classic Locality

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.9 × 2.5 × 2 cm
Description

The main-crystal is perched delicately atop a natural pedestal of calcite and oyelite-covered matrix. It is a sharp specimen with amazing geometry to it and the crystal atop is freestanding and highly lustrous. Very aesthetic in various positions, no significant damages to report.

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...

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

Calcite

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