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Fluorite Hydroxylherderite & Topaz

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HCH57246

Fluorite Hydroxylherderite & Topaz

Description Tabs

Description
Locality: 
Brabant Farm, Etiro, Erongo Region, Namibia
Size Range: 
Small cabinet (7-10 cm)
Size: 
6.5 × 7 × 4 cm
Largest Crystal: 
0.90cm
Description

A cluster of zonare coloured fluorites (brownish to greenish) up to 9 mm large.

The backside of this specimen is mostly covered by white earthy kaoline and small yellowish grains of illite or muskovite.

Some crystals of lightyellow hydroxylherderite up to 4 mm and white aggregates of topaz can also be seen.

Mineral Data
What's on the rock

Fluorite

Formula: 
CaF2
Strunz: 
3.AB.25
Crystal System: 
Isometric
Hardness: 
4.0
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Hydroxylherderite

Formula: 
CaBe(PO4)(OH,F)
Strunz: 
8.BA.10
Crystal System: 
Monoclinic
Hardness: 
5.0 - 5.5
Streak: 
white

Topaz

Formula: 
Al2(SiO4)(F,OH)2
Strunz: 
9.AF.35
Crystal System: 
Orthorhombic - Dipyramidal
Hardness: 
8.0
Streak: 
White

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