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Bultfonteinite & Poldervaartite

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CR630564

Bultfonteinite & Poldervaartite

Rare Mineral

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.8 × 4.2 × 4 cm
Largest Crystal: 
0.40cm
Description

A combination piece of the rare bultfonteinite, complemented by the pale brown poldervaartite crystals beneath them.  

The bultfonteinite is in its classic habit of sharp, delicate sprays with very high luster.  

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

Poldervaartite

Formula: 
CaCa[SiO3(OH)](OH)
Strunz: 
9.AF.90
Crystal System: 
Orthorhombic
Hardness: 
5.0
Streak: 
white
Type Locality: 
Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese field, Northern Cape Province, South Africa...