apophyllite

[ uh-pof-uh-lahyt, ap-uh-fil-ahyt ]

Phonetic (Standard)IPA

noun

apophyllite

/ əˈpɒfɪˌlaɪt; ˌæpəˈfɪlaɪt /

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: KCa 4 (Si 4 O 10 ) 2 (OH 1 F).8H 2 O

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First recorded in 1800–10; apo- + -phyll + -ite ¹

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C19: from French, from apo- + Greek phullon leaf + -ite ¹; referring to its tendency to exfoliate

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Apophyllite always occurs as distinct crystals, which belong to the tetragonal system.

Apophyllite, a species of mineral of a foliated structure and pearly lustre, called also fish-eye stone.

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