propylite

[prop-uh-lahyt]
noun Petrography.
a hydrothermally altered andesite or allied rock containing secondary minerals, as calcite, chlorite, serpentine, or epidote.

Origin:
1867; propyl + -ite1

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propylite (ˈprɒpɪˌlaɪt)
 
n
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]

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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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