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Bultfonteinite & Olmiite

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WND831578

Bultfonteinite & Olmiite

Rare Mineral - Type Locality
Classic Locality

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.5 × 6.2 × 5.2 cm
Description

A classic and very attractive combination of Olmiite and Bultfonteinite from the N'Chwaning II Mine in South Africa. The prismatic Olmiites reach up to 0,4 cm in length, with very sharp and uniform crystal habits. They are tan to caramel-brown, lustrous,and almost superb terminated. The fibrous Bultfonteinite needles reach up to also 0,4 cm, and their white color and superb pearly luster provide aesthetic and dramatic contrast with both the Olmiites and the chocolate-brown matrix. A superb combination specimen.

Mineral Data
What's on the rock

Bultfonteinite

Formula: 
Ca2(HSiO4)F·H2O
Strunz: 
9.AG.80
Hardness: 
4.5
Streak: 
white
Type Locality: 
Bultfontein, Lejweleputswa District, Free State Province, South Africa

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...
Wendel Minerals

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