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syenite    
n. 黑花岗石

黑花岗石


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  • Syenite - Wikipedia
    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
  • Syenite : Formation, Composition, Classification, Uses
    Syenite is a coarse-grained, plutonic (intrusive) igneous rock that primarily consists of the minerals feldspar, typically orthoclase feldspar, and often includes smaller amounts of other minerals such as hornblende, mica, or amphibole
  • Syenite | Igneous, Intrusive, Plutonic | Britannica
    Syenite, any of a class of intrusive igneous rocks essentially composed of an alkali feldspar and a ferromagnesian mineral A special group of alkali syenites is characterized by the presence of a feldspathoid mineral such as nepheline, leucite, cancrinite, or sodalite (see nepheline syenite)
  • Syenite Rock: Composition, Differences from Granite Formation - Sandatlas
    Syenite is a durable and aesthetically appealing rock, which makes it suitable for various construction and decorative purposes Although less common than granite, some syenitic rocks – especially those with attractive feldspar crystals – are quarried and used much like granites
  • Syenite: Mineral information, data and localities.
    Its name is derived from Syene, Egypt A G Werner in 1788 applied the name in its present meaning; the Egyptian rock is now classified as a granite, containing much quartz A coarse grained, felsic igneous Rock having an alkali-feldspar plagioclase ratio from 65-90% and felsic minerals contain <5% quartz
  • Syenite: A Coarse-grained Granite-Like Plutonic Rock
    Syenite is a coarse-grained, mostly light-colored intrusive rock with an intermediate to felsic composition It has mainly alkali feldspar, lesser plagioclase, and one or more mafic minerals
  • Syenite: Identification, Pictures, Info for Rockhounds
    Syenite is an intrusive igneous rock composed primarily of alkali feldspar, lesser amounts of of plagioclase feldspar, and under 20% quartz It is coarse-grained with tightly interlocking crystals Syenite is usually off-white, gray, greenish, red, or pink with black spots and no layering or banding
  • Syenite - Rock Identifier
    Syenites are products of alkaline igneous activity, generally formed in thick continental crustal areas, or in Cordilleran subduction zones To produce a syenite, it is necessary to melt a granitic or igneous protolith to a fairly low degree of partial melting
  • Syenite - Geology is the Way
    Syenites are a group of plutonic igneous rocks that consist almost entirely of alkali feldspar with minor amounts of Na-rich plagioclase and that represent the intrusive counterpart of trachytes
  • Syenite - Clark Science Center
    Syenite: "A plutonic rock consisting mainly of alkali feldspar with subordinate sodic plagioclase, biotite, pyroxene, amphibole and occasional fayalite Minor quartz or nepheline may also be present "





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