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Brassite & Rösslerite

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CAM105928

Brassite & Rösslerite

Description Tabs

Description
Locality: 
Jáchymov, Krušné Hory, Karlovy Vary Region, Czech Republic
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2 × 1.2 cm
Description

White brassite crystals and clear rösslerite crystals richly covering the matrix.
A very good and well-crystallized example of these uncommon magnesium-arsenates.

Mineral Data
What's on the rock

Brassite

Formula: 
Mg(HAsO4)·4H2O
Strunz: 
8.CE.15
Crystal System: 
Orthorhombic
Hardness: 
0.0
Colour: 
White
Streak: 
White
Type Locality: 
Jáchymov (St Joachimsthal), Jáchymov District (St Joachimsthal), Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic

Rösslerite

Formula: 
Mg(HAsO4)·7H2O
Strunz: 
8.CE.20
Crystal System: 
Monoclinic Fibrous crusts
Hardness: 
2.0 - 3.0
Streak: 
White
Type Locality: 
"Im Lochborn" Copper mine, Bieber, Gelnhausen, Spessart, Hesse, Germany...
Cartils Minerals

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