Formula: Fe2(AsO4)(SO4)(OH).5H2O
Origin of name: for D. Sarmiento, Argentine statesman
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: pale yellow-orange
Diaphaneity:
Luster:
Habit: crystals prismatic, elongated on c-axis, microscopic, nodular masses
Hardness:
Specific gravity: 2.58
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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