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

(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