- a hydrothermally altered andesite or allied rock containing secondary minerals, as calcite, chlorite, serpentine, or epidote.
Origin of propylite
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Examples from the Web for propylite
These consisted of rocks moderately rich in silica, and are grouped under the heads of propylite and andesite.Volcanoes: Past and Present
- geology an altered andesite or similar rock containing calcite, chlorite, etc, produced by the action of hot water
C20: from propylon (see propylaeum) + -ite 1; so named because it is associated with the start of the Tertiary volcanic era