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Formula: Fe2+Cr2(SO4)4.22H2O
Hydrated normal sulphate, halotrichite group,
chromium-bearing mineral
Specific gravity: 1.761 measured
Hardness: 2
Streak: White
Colour: White, pink, purple; the purple colour occurs on fractures across the fiber length.
Luminescence: Non-fluorescent
Solubility: Soluble in water
Environments
The IMA characterises redingtonite as questionable.
Localities
At the type locality, the Redington Mine, Knoxville, Knoxville Mining District, Napa county, California, USA,
redingtonite occurs as as oxidation product of pyrite, associated with
magnesiocopiapite and pyrite
(Mindat).
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