Images
Formula: (K2NaCa0.5)[Al4Si8O24].11H2O
Tectosilicate (framework silicate),
chabazite-levyne subgroup,
zeolite group
Crystal system: Trigonal
Specific gravity: 2.05 to 2.20 measured, 2.035 calculated
Hardness: 4
Streak: White
Colour: Colourless
Environments
Volcanic igneous environments
Sedimentary environments
Metamorphic environments
Hydrothermal environments
Chabazite-K 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 Ercolano, Metropolitan City of Naples, Campania, Italy.
Back to Minerals