It sounds like you may be looking for Peridotite, which is a type of ultramafic igneous rock that contain olivine as their main mineral in combination with pyroxenes and amphiboles. I hope this helps!
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.
