Formula: Fe16O16(OH)9.6(SO4)3.2.10H2O
Origin of name: for Udo Schwertmann, German soil scientist
Crystal system: tetragonal
Crystal class: 4/m
Twinning:
Unit cell:
Colour: yellowish brown
Diaphaneity: opaque
Luster: earthy
Habit: needles 2 to 4 nm by 60 to 90 nm in spherical to ellipsoidal aggregates 200 to 500 nm across, ocherous
Hardness:
Specific gravity: 3.77 to 3.99
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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