apophyllite /əˈpɒfɪlʌɪt/

a

I. noun [ mass noun]

1. a mineral occurring typically as white glassy prisms, usually as a secondary mineral in volcanic rocks. It is a hydrated silicate and fluoride of calcium and potassium.
– origin early 19th cent.: from apo- + Greek phullon ‘leaf’ + -ite1.

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