Okenite

minerals

apophyllite

prehnite

zeolite

Formula: Ca10Si18O46.18H2O
Phyllosilicate (sheet silicate)
Specific Gravity: 2.28 to 2.33
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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