Images
Faujasite comprises three mineral species:
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
They are tectosilicates (framework silicates), zeolite group
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).
Back to Minerals