Difference between revisions of "Obsidian"
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| − | '''Obsidian''' is a black, glass-like [[ | + | '''Obsidian''' is a black, glass-like [[Igneous_Rock|igneous]] [[rock]] that forms when [[lava]] cools quickly. Broken rocks have sharp edges. Ancients used it for blades in [[knives]] and [[tools]]. |
Kavanaugh, Pocket Naturalist | Kavanaugh, Pocket Naturalist | ||
Revision as of 02:33, May 2, 2007
Obsidian is a black, glass-like igneous 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)