Syenite

[saiәnait]

Definition

(n.) Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at Syene, in Upper Egypt, and now called granite.

(n.) A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elaeolite) or leucite, and is then called nephelite (elaeolite) syenite or leucite syenite.

Edited by Bradley

Definition

n. a rock composed of feldspar and hornblende.—adj. Syenit′ic relating to Syene in Egypt: pertaining to syenite.

Edited by Ervin