General Information:
Chemical Formula:Ca2Al3(SiO4)3(OH) = Ca2AlAl2(SiO4)(Si2O7)O(OH)
Composition:(Molecular Weight = 427.38 gm)Calcium 18.76 %
CaAluminum 12.63 %
AlSilicon 19.71 %
SiHydrogen 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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