6,484
edits
Difference between revisions of "Obsidian"
no edit summary
Occultwiki (talk | contribs) |
Occultwiki (talk | contribs) |
||
| Line 1: | Line 1: | ||
[[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. | ||