Formula: MnFe2(PO4)2(OH)2.8H2O
Origin of name: after locality Stewart mine, Pala, California, USA
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: yellow to brownish-yellow to orange-yellow
Diaphaneity:
Luster:
Habit: crystals minute, tufts of fibers
Hardness:
Specific gravity: 2.94
Cleavage: 1; distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with laueite
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