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Formula: Ca3(Si12Al6)O36.18H2O
Tectosilicate (framework silicate), zeolite
Crystal System: Trigonal
Specific gravity: 2.09 to 2.16 measured, 2.17 calculated
Hardness: 4 to 4½
Streak: White
Colour: Colourless, white, grey, yellow, red
Environments:
Lévyne-(Ca) occurs most commonly in cavities in low silica volcanic rocks such as
olivine
basalt, and rarely in
andesite, often associated with other
zeolites, especially
offretite and
erionite
(Dana).
Localities
The type locality is Dalsnipa, Dalur, Húsavík Municipality, Sandoy, Faroe Islands.
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