a·poph·yl·lite ( -p f -l t ,  p-f lt)n. A white, pale pink, or pale green crystalline mineral, essentially KCa4Si8O20(F,OH)·8H2O. |
apophyllite [əˈpɒfɪˌlaɪt ˌæpəˈfɪlaɪt]
n
(Earth Sciences / 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
[from French, from apo- + Greek phullon leaf + -ite1; referring to its tendency to exfoliate]
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