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'''Basalt''' is a green-gray to black [[Igneous rock|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)
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