apophyllite

[ uh-pof-uh-lahyt, ap-uh-fil-ahyt ]
/ əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt /

noun

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

Origin of apophyllite

First recorded in 1800–10; apo- + -phyll + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for apophyllite

apophyllite
/ (əˈpɒfɪˌlaɪt, ˌæpəˈfɪlaɪt) /

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

Word Origin for apophyllite

C19: from French, from apo- + Greek phullon leaf + -ite 1; referring to its tendency to exfoliate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012