what mineral would you expect to find in the greatest abundance in a rock that is classified as mafic?

Mafic rock, in geology, igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour.

ANSWER: Mafic rock, in geology, igneous rock that is dominant by the silicates pyroxene, amphibole, olivine, and mica. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark color.

I hope this helps.

What exactly do you mean 

2. x2 + 8x + 12 = 0 to prove: x = -6 or x = -2