apophyllite

(-ə līt′)

noun

a semihard, hydrous, tetragonal mineral, KCaSiO(F,OH)·8HO, usually found as variously colored crystals or flat, sheetlike plates

Origin: < apo- + Gr phyllon, a leaf + -ite: so named from its flaking off under the blowpipe

See apophyllite in American Heritage Dictionary 4

noun

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

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