General Information:
Chemical Formula:
Th(SiO4)1-x(OH)4x
Composition:
(Molecular Weight = 321.72 gm)
Thorium 72.13 % Th
Silicon 7.86 % Si
Hydrogen 0.13 % H
Oxygen 19.89 % O
Empirical Formula:
Th(SiO4)0.9(OH)0.4
Locality:
Llano Co., texas, USA.
Name Origin:
Named after gummite and the element thorium.
Physical Properties:
Color:
brown, greenish gray, buff, white, or black.
Density:
5.4
Diaphaniety:
Opaque
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
Hardness:
5.5 - Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Dull
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