Formula: CaSb4O4(OH)2(SO4)2.2H2O
Origin of name: after locality Pereta mine, Tuscany, Italy
Crystal system: monoclinic
Crystal class: 2/m
Twinning: universal on {100}
Unit cell: a = 24.64 Å, b = 5.60 Å, c = 10.18 Å, b = 96.0°
Colour: colourless
Diaphaneity:
Luster: vitreous
Habit: crystals tabular, usually twinned, to 5 mm, in aggregates
Hardness: 3.5
Specific gravity: 4.0
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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