Basalt Basalt is one of the most common types of rock on planetary surfaces. It is a dark-colored, igneous rock that usually contains the minerals olivine, pyroxene, and feldspar. This basalt came from Mauna Loa, Hawaii. To learn much more about this rock, visit the Imperial College Rock Library. Imperial College Rock Library

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates