noun Petrography.
a hydrothermally altered andesite or allied rock containing secondary minerals, as calcite, chlorite, serpentine, or epidote.

1867; propyl + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
propylite (ˈprɒpɪˌlaɪt)
geology an altered andesite or similar rock containing calcite, chlorite, etc, produced by the action of hot water
[C20: from propylon (see propylaeum) + -ite1; so named because it is associated with the start of the Tertiary volcanic era]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Silica alteration usually occurs adjacent to deposit minerals, and successive outward are are sericite and propylite alterations.
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