propylite
/ˈprɒpɪlʌɪt/Geology
noun
A hydrothermally altered andesite or dacite resembling greenstone, typically containing calcite, chlorite, and quartz.
Origin
Mid 19th century. From ancient Greek πρόπυλον propylon + -ite; so named by F. von Richthofen as opening the Tertiary period.