apophyllite

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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.

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]

a•poph•yl•lite

(əˈpɒf əˌlaɪt, ˌæp əˈfɪl aɪt)

n.
a hydrous potassium and calcium silicate mineral occurring in transparent crystals.
[1800–10]