General Information:
Chemical Formula:(K2,Ca)5Al10Si26O72·30(H2O)
Environment:Alteration of basalt with the addition of potash.
IMA Status:Approved IMA 1962
Locality:Mont Simiouse, near Montbrison, Loire, France.
Physical Properties: Cleavage:[0001] Distinct
Color:colorless or white.
Density:2.13
Diaphaniety:Transparent to Translucent
Hardness:4-4.5 - Between Fluorite and Apatite
Luster:Vitreous (Glassy)
Streak:white
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