Apophyllite
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
noun
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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Anatomy, Botany. an outgrowth; process; projection or protuberance. Architecture, . Historical Examples apophysis, any irregular swelling; the enlargement at the base of the spore-case of the Umbrella-Moss. The Elements of Botany Asa Gray No ctenidium, but a pulmonary cavity; operculum with an apophysis. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 Various The central region […]
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