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Brassite

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RGR811340

Brassite

Type Locality

Description Tabs

Description
Locality: 
Svornost Mine, Jáchymov, Krušné Hory, Karlovy Vary Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
11.5 × 5.5 × 4 cm
Description

Specimen from Type locality. Brassite is a very rare hydrated Mg-arsenate and ancient Jachymov is the Type Locality.  A very fine, rich and rare example of the combination cabinet specimen. Very rare white opaque Brassite crystals occurring with slender and long up to 1cm glassy Pharmacolite crystals. At the same time on the sample is a sphere of white needles Picropharmacolite.

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