syenite - traducción al francés
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syenite - traducción al francés

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
  • Concord]], North Carolina, c. 1910.
  • [[QAPF diagram]] that shows the [[quartz]] (Q), [[alkali feldspar]] (A), and [[plagioclase]] (P) composition of syenite
  • Syenite from Corsica

syenite      
n. syenite (Geology)

Definición

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.

Wikipedia

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.