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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