- a hydrous potassium and calcium silicate mineral occurring in white crystals.
Origin of apophyllite
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Examples from the Web for apophyllite
Apophyllite, a species of mineral of a foliated structure and pearly lustre, called also fish-eye stone.
Apophyllite always occurs as distinct crystals, which belong to the tetragonal system.
- 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: KCa 4 (Si 4 O 10) 2 (OH 1 F).8H 2 O
C19: from French, from apo- + Greek phullon leaf + -ite 1; referring to its tendency to exfoliate
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