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Formula: Ca3(Si10Al6)O32.12H2O
Tectosilicate (framework silicates), phillipsite subgroup,
zeolite group, forms series with
harmotome, phillipsite-Na
and phillipsite-K
Specific gravity: 2.2 measured, 2.2 calculated
Hardness: 4 to 5
Streak: White
Colour: White, colourless, reddish white, light yellow, pink
Luminescence: Not fluorescent under UV
Solubility: Moderately soluble in hydrochloric acid
Environments:
Sedimentary environments
Hydrothermal environments
Basaltic cavities (most commonly)
Phillipsite-Ca is a common zeolite in
basaltic
cavities, ore veins, lithified rhyolitic vitric
tuff, saline lake deposits and ocean floor sediments.
Phillipsite-Ca is a mineral of the zeolite facies
The type locality is the Lower Salt Lake Tuff, Puuloa Road, Oahu Island, Honolulu County, Hawaii, USA.
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