Formula: (Cu,Zn)2(CO3)(OH)2
Origin of name: after locality Rosas mine, Sulcis, Sardinia, Italy
Crystal system: monoclinic
Crystal class: 2/m
Twinning: universal about axis perpendicular to {100}
Unit cell: a = 9.37 Å, b = 12.12 Å, c = 3.13 Å, b = 90.1°
Colour: green to blue, sky-blue
Diaphaneity:
Luster:
Habit: microscopic crystals in crusts, botryoidal and mammilary crusts
Hardness: about 4.5
Specific gravity: 4.0 to 4.2
Cleavage: 2; at right angles
Tenacity: brittle
Streak:
Synonyms/varieties:
Comments:
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