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Qu'est-ce (qui) est syenite - définition

DEEP IGNEOUS ROCKS MADE OF ALKALI FELDSPAR AND ACIDIC / INTERMEDIATE PLAGIOCLASE, THE MOST COMMON MINOR CONSTITUENTS ARE HORNBLENDE, BIOTITE, MUSCOVITE AND ACCESSORY ARE ZIRCON, APATITE, SFEN; VOLCANIC EQUIVALENT: TRACHYTE.

Episyenite; Sienite; Yooperlite

Syenite

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

II. Syenite ·noun 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.

syenite

['s???n??t]

¦ noun Geology a coarse-grained grey igneous rock composed typically of alkali feldspar and hornblende.

Derivatives

syenitic adjective

Origin

C18: from Fr. syenite, from L. Syenites (lapis) '(stone) of Syene', Greek name of Aswan in Egypt.

Nepheline syenite

HOLOCRYSTALLINE PLUTONIC ROCK

Nephelite-syenite; Nephelinesyenite; Nepheline-syenite; Nepheline-Syenite; Nephelite syenite

Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known.

https://en.wikipedia.org/wiki/Nepheline_syenite

Wikipédia

Syenite

Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in relatively small concentrations (< 5%). It is considered a granitoid. Some syenites contain larger proportions of mafic components and smaller amounts of felsic material than most granites; those are classed as being of intermediate composition.

The extrusive equivalent of syenite is trachyte.

https://en.wikipedia.org/wiki/Syenite