Basalt
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Basalt is a green-gray to black igneous rock. The most common volcanic rock, it makes up most of the ocean floor. Basalt may occur in long columns.
Kavanaugh, Pocket Naturalist
Sources
- Kavanaugh, James. Pocket Naturalist - Geology - An Introduction to familiar Rocks, Minerals, Gemstones & Fossils, Waterford Press: Arizona (2000)