leucite syenite

1 definition found

leucite syenite - Collaborative International Dictionary of English v.0.48 :

  Syenite \Sy"e*nite\, n. [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 (elaeolite) or leucite, and is then
         called nephelite (elaeolite) syenite or leucite   syenite
         .
         [1913 Webster]