a hydrous potassium and calcium silicate mineral occurring in white crystals.
Historical Examples

apophyllite, a species of mineral of a foliated structure and pearly lustre, called also fish-eye stone.
The New Gresham Encyclopedia. Vol. 1 Part 2 Various

apophyllite always occurs as distinct crystals, which belong to the tetragonal system.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3 Various

a white, colourless, pink, or green mineral consisting of a hydrated silicate of calcium, potassium, and fluorine in tetragonal crystalline form. It occurs in cracks in volcanic rocks. Formula: KCa4(Si4O10)2(OH1F).8H2O


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