White crystal aggregates of the very rare mineral redingtonite associated to orange botryogen crystals from the type locality in Redington mine (Redington Mine, Knoxville, Napa County, California, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Redingtonite
Redingtonite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Fe²⁺Cr₂(SO₄)₄·22H₂O.
It is a member of the Halotrichite structural group.
Key properties: specific gravity 1.761; Silky luster.
IMA symbol Rdt, IMA status: questionable, named in 1888.
An oxidation product of pyrite.
It is found associated with Magnesiocopiapite, pyrite.
The name refers to its occurrence in the Redington mine, California, USA.