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Formula: (Na,Ca,Mg)2(Si,Al)12O24·15H2O
Hydrated tectosilicate (framework silicate), faujasite subgroup,
zeolite group
Crystal system: Isometric
Specific gravity: 1.92 to 1.93 measured, 2.09 calculated
Hardness: 5
Streak: White
Colour: White, colourless, brown; colourless in thin section
Environments
Volcanic igneous environments
Hydrothermal environments
Faujasite-Na is a rare mineral, occurring in vesicles of
basalts, phonolites
and tuffs. It is formed by
palagonisation or authigenically. Associated minerals include
zeolites, olivine,
augite and nepheline
(HOM).
Localities
The type locality is the Limberg Quarries, Sasbach am Kaiserstuhl, Emmendingen, Freiburg Region, Baden-Württemberg,
Germany.
Faujasite-Na from the Limberg Quarries -
Image
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