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  2. Norite - Wikipedia

    en.wikipedia.org/wiki/Norite

    The principal difference between norite and gabbro is the type of pyroxene of which it is composed. Norite is predominantly composed of orthopyroxenes, largely high-magnesian enstatite or an iron-bearing hypersthene. The principal pyroxenes in gabbro are clinopyroxenes, generally iron-rich augites. [2] [3]

  3. Gabbro - Wikipedia

    en.wikipedia.org/wiki/Gabbro

    Gabbro is known in the construction industry by the trade name of black granite. [31] However, gabbro is hard and difficult to work, which limits its use. [32] The term "indigo gabbro" is used as a common name for a mineralogically complex rock type often found in mottled tones of black and lilac-grey.

  4. Quartz Vs. Granite: Which Stone Is Right For Your ... - AOL

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  5. Calc-alkaline magma series - Wikipedia

    en.wikipedia.org/wiki/Calc-alkaline_magma_series

    The calc-alkaline magma series is one of two main subdivisions of the subalkaline magma series, the other subalkaline magma series being the tholeiitic series. A magma series is a series of compositions that describes the evolution of a mafic magma, which is high in magnesium and iron and produces basalt or gabbro, as it fractionally crystallizes to become a felsic magma, which is low in ...

  6. Black granite - Wikipedia

    en.wikipedia.org/wiki/Black_granite

    In the construction industry, black rocks that share the hardness and strength of granitic rocks are known as black granite. In geological terms, black granite might be gabbro , diabase , basalt , diorite , norite , or anorthosite .

  7. Quartz gabbro - Wikipedia

    en.wikipedia.org/wiki/Quartz_gabbro

    Quartz gabbro is an intrusive rock with a composition intermediate between gabbro and tonalite.It is defined in the QAPF classification as coarse-grained igneous rock in which quartz makes up 5% to 20% of the QAPF mineral fraction, plagioclase makes up 90% or more of the total feldspar content, and the plagioclase is calcium-rich (%An > 50).

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  9. A-type granite - Wikipedia

    en.wikipedia.org/wiki/A-type_granite

    A-type granite is a particular category of the S-I-A-M or 'alphabet' system which classifies granitoids and granitic rock by their photoliths or source. [1] [2] The 'A' stands for Anorogenic or Anhydrous, as these granites are characterized by low water content and a lack of orogenic or transitional tectonic fabric. [3]

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