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Ammonioalunite

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SKY797238

Ammonioalunite

Classic Locality

Description Tabs

Description
Locality: 
Kladno District, Central Bohemian Region, Czech Republic
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.8 × 0.4 cm
Description

Pale brown crystal aggregates of the rare mineral ammonioalunite from Kladno.

Mineral Data
What's on the rock

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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