An igneous rock that contains mostly pyroxene and olivine has ?

Ultrabasic rocks like mafic rocks

Explanation:

Usually, have 45% of silica and mostly are mafic rocks contain mostly minerals like pyroxene and olivines example of peridotite, these minerals make up 90% of the volume of igneous rocks and thus are easy to identify. Being rich in iron and magnesium and thus contain abundant calcium-rich feldspar thus they being dark o black in color.  The presence of this pyroxene and olivine has also found in extraterrestrial rocks like the lunar rocks and often have been seen in a combination with minerals like hornblende.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem