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Formula: (NH4)3H(SO4)2
Anhydrous acid sulphate
Specific gravity: 1.83 measured, 1.82 calculated
Hardness: 1 to 2
Streak: White
Colour: Colourless, white; colourless in transmitted light
Solubility: Readily soluble in water, volatile
Environments
Hot spring deposits
Coal-seam fires
Localities
At the type locality, Vísky, Blansko District, South Moravian Region, Czech Republic, rare letovicite is
formed as corroded tabular crystals on burning coal mine waste heaps, associated with
sulphur
(Mindat, HOM).
At The Geysers, West Mayacmas Mining District, Sonoma county, California, USA, letovicite is deposited from
hot springs and associated with mascagnite and
boussingaultite
(HOM).
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