Why to igneous rocks have the same minerals different names

Gabbro and basalt are two igneous rocks having the same chemical composition, and the same minerals (plagioclase feldspar + pyroxene), but are of different origins. Gabbros form at depths and cool slowly, whereas basalts are volcanic rocks that crystallize rapidly at the surface of the earth.

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )