SYENITE

Etymology

Noun

syenite (countable and uncountable, plural syenites)

(geology, obsolete) Granite.

(geology) An igneous rock composed of feldspar and hornblende.

Source: Wiktionary

Sy"e*nite, n. Etym: [L. Syenites (sc. lapis), from Syene, Gr. (Min.) (a) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite. (b) A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elæolite) or leucite, and is then called nephelite (elæolite) syenite or leucite syenite.

Source: Webster’s Unabridged Dictionary 1913 Edition