What makes gabbro a rock and not a mineral

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Explanation:

Gabbro is usually made up of such as pyroxene, plagioclase, amphibole and olivine which makes it an intrusive igneous rock. It is not considered as a mineral since it is composed of an aggregate of minerals or non-minerals and does not have one specific chemical composition.

or

Gabbro is a type of intrusive igneous rock found underneath the surface of the Earth, especially in oceanic crust. Gabbro is a dark rock with large, coarse grains that are typically black or dark green in color. It can often be found with white crystals as well.