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2 January, 00:08

Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?

(1) granite

(2) rhyolite

(3) gabbro

(4) basalt

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Answers (1)
  1. 2 January, 00:20
    0
    (3) Gabbro

    Explanation:

    Gabbro is a dark-colored, coarse-grained and intrusive igneous rock. Generally, this type of rock is having dark green or black color. The main composition of this type of rock is augite and plagioclase minerals.

    The approximate composition of Gabbro rock given as

    1.25% plagioclase feldspar

    2.5% amphibole

    3.10% olivine

    5460% pyroxene

    Therefore the answer will be (3).

    (3) Gabbro
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