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Formula: Al4(SO4)(OH)10.4H2O
Hydrated sulphate containing hydroxyl
Crystal System: Hexagonal
Specific gravity: 2.33 measured, 2.20 calculated
Hardness: 1½
Colour: Colourless, yellow, white; colourless in transmitted light
Environments
Felsőbányaite is found in the oxide zone of marcasitic ores; it may
originate as a dehydration product of hydrobasaluminite
(Mindat).
Localities
At the type locality, the Baia Sprie mine, Baia Sprie, Maramureș County, Romania, felsőbányaite is a rare product
of oxidation of marcasite ores. Associated minerals include
marcasite, stibnite,
baryte and quartz
(HOM).
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