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Ammonioalunite

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GMN212072

Ammonioalunite

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Description
Locality: 
Pécs-Vasas, Pécs, Mecsek Mountains, Baranya County, Hungary
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.4 × 1.5 × 0.8 cm
Description

Translucent balls, and crystal clusters of rhombs on matrix. Very rich and good crystallized specimen of this extremely rare mineral.

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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