Formula: FeFe5(PO4)4(OH)5 . 4H2O
Origin of name: After locality; Beraun (now Beroun), Czech Republic
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: On {100}, penetration
Unit cell: a = 20.80 Ǻ, b = 5.16 Ǻ, c = 19.22 Ǻ, β = 90.3°
Colour: Reddish-brown to dark red, grayish green to dark greenish brown
Diaphaeity:
Habit: Crystals tabular and somewhat elongated, striated parallel to elongation; foliated crusts, radial fibrous aggregates
Hardness: 3.5 to 4
Specific gravity: 3.01
Cleavage: 1; {100} good
Streak: Yellow to greenish brown
Synonyms/varieties:
Comments:
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