n. [ L. Syenites (sc. lapis), from Syene, Gr. &unr_;. ] (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 ]
n. [ After Jena, in Germany. ] (Min.) A silicate of iron and lime occurring in black prismatic crystals; -- also called ilvaite. [ Spelt also jenite. ] [ 1913 Webster ]
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