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What is "leucite syenite"

The Collaborative International Dictionary
leucite syenite

Syenite \Sy"e*nite\, n. [L. Syenites (sc. lapis), from Syene, Gr. ?.] (Min.)

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

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