The phillipsite group is a group of tectosilicates (framework silicates) and a sub-group of the
zeolite group, comprising:
Phillipsite forms a series with harmotome
Specific gravity: 2.2
Hardness: 4 to 5
Solubility: Moderately soluble in hydrochloric acid
Basaltic cavities (most commonly)
Phillipsite is a common zeolite in basaltic cavities, ore veins, lithified rhyolitic vitric
(consolidated pyroclastic rock),
saline lake deposits, and ocean floor sediments.
It forms in Iceland in geothermal wells at 60 to 85oC
Phillipsite is a mineral of the zeolite facies
In the basaltic rocks near Kladno, Czechoslovakia, phillipsite is associated with thomsonite, mesolite, chabazite and natrolite, and it is always the first of these minerals to have been formed.
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