Formula: (K,Na,Ca)1-2(Si,Al)8O16.6h2O
Origin of name: for W. Phillips, British mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning: universal on {001}, {021} or {110}, penetration
Unit cell: a = 9.88 Å, b = 14.32 Å, c = 8.69 Å, b = 124.3°
Colour: colourless, white, yellowish, reddish
Diaphaneity:
Luster: vitreous
Habit: crystals penetration twins, in druses or spherulites
Hardness: 4 to 4.5
Specific gravity: 2.20
Cleavage: 2; {010} and {100} distinct
Tenacity: uneven, brittle
Streak: white
Synonyms/varieties:
Comments: member of the zeolite group
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