propylite noun. ['prɒpɪlʌɪt] M19.
[formed as PROPYLON (with ref. to the opening of the Tertiary volcanic period) + -ITE¹.]
Geology. A greenish rock formed by hydrothermal alteration of an igneous rock, esp. andesite.

■ propylitic [-'lɪtɪk] adjective of or pertaining to propylite L19.

■ propyliti'zation noun the hydrothermal alteration of an igneous rock to propylite, esp. around a body of ore E20.

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