apophyllite

a·poph·yl·lite

 (ə-pŏf′ə-līt′, ăp′ə-fĭl′īt′)

n.

A white, pale pink, or pale green crystalline mineral, essentially KCa₄Si₈O₂₀(F,OH)·8H₂O.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

apophyllite

(əˈpɒfɪˌlaɪt; ˌæpəˈfɪlaɪt)

n

(Minerals) 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

[C19: from French, from apo- + Greek phullon leaf + -ite¹; referring to its tendency to exfoliate]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

a•poph•yl•lite

(əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt)

n.

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

[1800–10]

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