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What makes gabbro a rock and not a mineral?

A Gabbro is made out of several minerals

B Gabbro has a consistant chemical composition

C Gabbro has a distinct lattice structure

D Gabbro is a naturally occuring inorganic structure

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Kalahira
I believe the correct answer is A. gabbro is made out of several minerals.
Given that its composition is not simple, because it consists of several various minerals, it cannot be called a mineral, but rather a rock. It consists of minerals such as feldspars, pyroxene, and olivine. 

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