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Formula: (Na3K)[Al4Si8O24].11H2O
Tectosilicate (framework silicate),
chabazite-levyne subgroup,
zeolite group, formerly called herschelite.
Crystal system: Trigonal
Specific gravity: 2.09 measured, 2.035 calculated
Hardness: 4 to 5
Streak: White
Colour: Colourless
Environments
Chabazite-Na occurs in volcanic rocks such as
basalts and andesite;
it is rarer in limestones and
schists; hydrothermally deposited in cavities and joints in ore veins
and in tuff in lake deposits, altered from volcanic glass.
Associated minerals include other zeolites,
nepheline, melilite,
olivine, pyroxenes,
amphiboles, axinite,
epidote, calcite,
tridymite and dolomite
(HOM).
Localities
The type locality is Rupe di Aci Castello, Aci Castello, Metropolitan City of Catania, Sicily, Italy.
Chabazite-Na from Rupe di Aci Castello -
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