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Formula: (NH4)2Fe3+3(SO4)4(OH)3.3H2O
Hydrated sulphate
Crystal System: Triclinic
Specific gravity: 2.31 measured, 2.32 calculated
Colour: Orange-yellow
Solubility: Very slowly soluble in water
Environments
Localities
At the type locality, the Lone Creek Falls cave, Lone Creek Falls, Sabie, Thaba Chweu Local Municipality,
Ehlanzeni District Municipality, Mpumalanga, South Africa, clairite occurs as a rare
secondary mineral formed on the ceiling of the cave by
alteration of pyrite to ferric sulphate, and reaction, at pH ∼2 (strongly
acid), with ammonia produced as the result of decay of organic matter. Associated minerals include
lonecreekite, sabieite
and tschermigite
(HOM).
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