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syenite    
n. 黑花岗石

黑花岗石


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  • Syenite - Wikipedia
    Syenites are products of alkaline igneous activity, generally formed in thick continental crustal areas, or in Cordilleran subduction zones The formation of syenites can be theorized to be from the melt of granitic or igneous protolith to a fairly low degree of partial melting
  • Syenite : Formation, Composition, Classification, Uses - Geology Science
    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 Unlike granite, which is another common intrusive igneous rock, syenite contains minimal to no quartz The
  • 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: 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: 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 Also, it may have a small amount of quartz
  • 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 - Meaning, Definitions, Classification, Properties and Uses
    It is an intrusive igneous rock that consists of ferromagnesian mineral alkali feldspar and usually coarse-grained If we talk about its composition, that is generally the same as granite It contains medium quantities of silica large amounts of alkalis and alumina
  • Syenite: Mineral information, data and localities. - mindat. org
    3 photos of Syenite associated with Apatite: Ca 5 (PO 4) 3 (Cl F OH) 2 photos of Syenite associated with Cancrinite (Na,Ca, ) 8 (Al 6 Si 6 O 24)(CO 3,SO 4) 2 · 2H 2 O: 2 photos of Syenite associated with Quartz: SiO 2: 2 photos of Syenite associated with K Feldspar: 1 photo of Syenite associated with Pegmatite: 1 photo of Syenite associated
  • Syenite - Encyclopedia. com
    syenite A saturated, coarse-grained, igneous rock consisting of essential alkali feldspar and ferromagnesian minerals (biotite, hornblende, arfvedsonite, aegirine-augite, and or aegirine) and accessory apatite, zircon, and iron oxides The feldspar constitutes more than 65% of the rock
  • Syenite - an overview | ScienceDirect Topics
    Syenite is a coarsely crystalline plutonic intermediate rock consisting chiefly of alkali feldspar with less than 5% quartz and or feldspathoid Clinopyroxene, hornblende, biotite mica, or olivine may be present in minor proportions





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