General Information:
Chemical Formula:
(Na,K,Ca)7-8(Si,Al)12O24(SO4,Cl)1-2
IMA Status:
Approved IMA 1981
Physical Properties:
Cleavage:
None
Color:
light violet blue.
Density:
2.35
Diaphaniety:
Transparent to Translucent
Hardness:
5-6 - Between Apatite and Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
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