General Information:
Chemical Formula:
[ ]Ca2Mg5Si8O22(OH)2
Composition:
(Molecular Weight = 812.37 gm)
Calcium 9.87 % Ca
Magnesium 14.96 % Mg
Silicon 27.66 % Si
Hydrogen 0.25 % H
Oxygen 47.27 % O
Empirical Formula:
Ca2Mg5(Si8O22)(OH)2
Environment:
Contact metamorphism of Ca rich rocks.
IMA Status:
Approved IMA 1978
Locality:
Tremola Valley, Alps.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[110] Perfect, [010] Distinct
Color:
brown, colorless, gray, white, or light green.
Density:
2.9 - 3.2, Average = 3.05
Diaphaniety:
Transparent to translucent
Habits:
Columnar - Forms columns, Massive - Fibrous - Distinctly fibrous fine-grained forms., Massive - Granular - Common texture observed in granite and other igneous rock.
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Fluorescent, Short UV=yellow, Long UV=pink.
Luster:
Vitreous - Pearly
Streak:
white
More details...