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apophyllite

[uh-pof-uh-lahyt, ap-uh-fil-ahyt] /əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt/
noun
1.
a hydrous potassium and calcium silicate mineral occurring in white crystals.
Origin of apophyllite
1800-1810
1800-10; apo- + -phyll + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for apophyllite

apophyllite

/əˈpɒfɪˌlaɪt; ˌæpəˈfɪlaɪt/
noun
1.
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
Word Origin
C19: from French, from apo- + Greek phullon leaf + -ite1; referring to its tendency to exfoliate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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