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Tschermigite & Ammonioalunite

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FDW45505

Tschermigite & Ammonioalunite

Description Tabs

Description
Locality: 
Anna Mine, Alsdorf, Cologne, North Rhine - Westphalia, Germany
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 5 × 3 cm
Description

A mineral that does not come on the market often... This specimen consists almost completely of tschermigite, on one part accompanied by ammonioalunite. The tschermigite forms elongated white transparent crystals. Specimens from this find were analysed. Found by seller in 2006.

High resolution mineral images (tiff 75 MB), for use in articles or to print A3 for your wall, will be provided as download on request.

Mineral Data
What's on the rock

Tschermigite

Formula: 
(NH4)Al(SO4)2·12H2O
Strunz: 
7.CC.20
Hardness: 
1.5 - 2.0
Type Locality: 
Cermniky (Tschermig), Kadaň (Kaaden), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic

Ammonioalunite

Formula: 
(NH4)Al3(SO4)2(OH)6
Strunz: 
7.BC.10
Crystal System: 
Trigonal
Hardness: 
2.0 - 3.0
Streak: 
white
Type Locality: 
The Geysers, West Mayacmas District, Mayacmas Mts (Mayacamas Mts), Sonoma Co., California, USA
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