General Information:
Chemical Formula:
Th(Ca,Na)2K1-xSi8O20
IMA Status:
Approved IMA 1981
Physical Properties:
Cleavage:
None
Color:
brown or yellow green.
Density:
2.95
Diaphaniety:
Translucent
Hardness:
5 - Apatite
Luster:
Vitreous - Dull
Streak:
white
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