General Information:
Chemical Formula:
Mg3(SiO4)(F,OH)2
Composition:
(Molecular Weight = 202.00 gm)
Magnesium 36.10 % Mg
Silicon 13.90 % Si
Hydrogen 0.25 % H
Oxygen 35.64 % O
Fluorine 14.11 % F
Empirical Formula:
Mg3(SiO4)F1.5(OH)0.5
Locality:
Ostanmosoa iron mine, Norberg, Vastmanland, Sweden.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[???] Distinct
Color:
white, yellow, brown, or red.
Density:
3.1 - 3.2, Average = 3.15
Diaphaniety:
Transparent to translucent
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Fluorescent.
Luster:
Vitreous - Resinous
Streak:
white
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