Formula: Fe2(PO4)(SO4)(OH) . 5H2O
Origin of name: From Greek for successor
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 9.475 Å, b = 9.60 Å, c = 7.328 Å, a = 98.7°, b = 107.8°, γ = 64.8°
Colour: Yellow to brown, reddish brown, greenish yellow, pale
Diaphaneity:
Luster: Resinous, waxy, dull
Habit: Amorphous, gel-like; microcrystalline masses or hexagonal plates; crusts, masses, botryoidal, stalactitic
Hardness: 3 to 4
Specific gravity: 2.0 to 2.4
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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