General Information:
Chemical Formula:
Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Composition:
(Molecular Weight = 427.38 gm)
Calcium 18.76 % Ca
Aluminum 12.63 % Al
Silicon 19.71 % Si
Hydrogen 0.24 % H
Oxygen 48.67 % O
Empirical Formula:
Ca2Al2Si3O12(OH)
Environment:
Metamorphic and pegmatite rocks.
Locality:
Rauris and Saualpe, Austria.
Name Origin:
Named after the Austrian natural scientist, S. Zois (1747-1819).
Physical Properties:
Cleavage:
[001] Perfect
Color:
gray, apple green, brown, blue, or rose red.
Density:
3.3
Diaphaniety:
Transparent to subtranslucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Striated - Parallel lines on crystal surface or cleavage face., Columnar - Forms columns
Hardness:
6.5 - Pyrite
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
white
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