Formula: (Fe,Mg,Ni)(Cr,Al)2(SO4)4.22H2O
Origin of name: after locality Redington mine, Napa County, California, USA
Crystal system: monoclinic
Crystal class: 2
Twinning:
Unit cell:
Colour: pale purple
Diaphaneity:
Luster: silky
Habit: massive, fine parallel-fibrous
Hardness:
Specific gravity: 1.76
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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