General Information:
Chemical Formula:
(Cu,Zn)2(CO3)(OH)2
Composition:
(Molecular Weight = 222.04 gm)
Zinc 14.72 % Zn
Copper 42.93 % Cu
Hydrogen 0.91 % H
Carbon 5.41 % C
Oxygen 36.03 % O
Empirical Formula:
Cu1.5Zn0.5(CO3)(OH)2
Name Origin:
Named after its locality at the Rosas mine, Sulcis, Sardinia.
Physical Properties:
Cleavage:
[010] Perfect, [100] Perfect
Color:
blue green, light blue, or sky blue.
Density:
4 - 4.2, Average = 4.09
Diaphaniety:
Transparent to Translucent
Habits:
Spherical - Spherical, rounded aggregates., Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite)., Encrustations - Forms crust-like aggregates on mat rix.
Hardness:
4 - Fluorite
Luster:
Vitreous - Silky
Streak:
light blue
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