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apophyllite
a·poph·yl·lite A0371000 (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] apophyllite
apophyllite[ə′päf·ə‚līt] (mineralogy) A hydrous calcium potassium silicate containing fluorine and occurring as a secondary mineral with zeolites with geodes and other igneous rocks; the composition is variable but approximates KFCa4(Si2O5)4·8H2O. Also known as fish-eye stone. |