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The faujasite subgroup includes:
Faujasite-Ca:
(Ca,Na,Mg)2(Si,Al)12O24.15H2O
Faujasite-Mg:
(Mg,Na,K,Ca)2(Si,Al)12O24.15H2O
Faujasite-Na:
(Na,Ca,Mg)2(Si,Al)12O24.15H2O
The faujasite subgroup is a member of the zeolite group
The faujasites are tectosilicates (framework silicates)
Specific gravity: 1.92 to 1.93
Hardness: 4½ to 5
Streak: White
Colour: Colourless, white, pale brown
Environments:
Sedimentary environments
Basaltic cavities
Faujasite usually occurs in cavities in basaltic volcanics, and
also as an
alteration product of volcanic
tuff
(Dana). Associated minerals include other zeolites,
olivine, augite and
nepheline
(HOM).
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