Formula: Ca10Si18O46.18H2O
Phyllosilicate (sheet silicate)
Crystal System: Triclinic
Specific Gravity: 2.28 to 2.33 measured, 2.33 calculated
Hardness: 4½ to 5
Streak: White
Colour: Colourless, white, pale yellow, blue
Common impurities: Al,Fe,Sr,Na,K
Environments:
Carbonatites
Basaltic cavities
Okenite is a secondary mineral derived from the alteration of basalt (Webmin).
It occurs in cavities in
basalt or related eruptive rocks. In
limestone at Crestmore, California, USA, and in carbonatites. It is
often associated with
zeolites,
apophyllite, calcite,
prehnite and quartz
(HOM, Dana).
Localities
The type locality is Qutdligssat, Disko Island, Qeqertalik, Greenland, Denmark.
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