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Difference between revisions of "Obsidian"
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[[File:Obsidian.jpg|300px|thumb|Piece of obsidian]] | [[File:Obsidian.jpg|300px|thumb|Piece of obsidian]] | ||
'''Obsidian''' is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. | '''Obsidian''' is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal [[crystal]] growth. It is an igneous rock. | ||
Obsidian is mineral-like, but not a true mineral because, as a glass, it is not crystalline; in addition, its composition is too variable to be classified as a mineral. It is sometimes classified as a mineraloid. | Obsidian is mineral-like, but not a true mineral because, as a glass, it is not crystalline; in addition, its composition is too variable to be classified as a mineral. It is sometimes classified as a mineraloid. | ||