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'''Obsidian''' is a black, glass-like [[rock]] that forms when [[lava]] cools quickly. Broken rocks have sharp edges. Ancients used it for blades in [[knives]] and [[tools]].
Kavanaugh, Pocket Naturalist
=Sources=
*Kavanaugh, James. ''Pocket Naturalist - Geology - An Introduction to familiar Rocks, Minerals, Gemstones & Fossils'', Waterford Press: Arizona (2000)
Kavanaugh, Pocket Naturalist
=Sources=
*Kavanaugh, James. ''Pocket Naturalist - Geology - An Introduction to familiar Rocks, Minerals, Gemstones & Fossils'', Waterford Press: Arizona (2000)