Obsidian
© 2003 by the Center For Social Research, Parkland College
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TEXTURE:
The texture in purer expressions is very fine.
LUSTER:
Luster is glassy.
COLOR:
While swirls of brown, red, green, and semi-translucency occur, black is the classic color.
FOSSILS:
There are no fossils in obsidian.
STRUCTURAL CHARACTERISTICS:
Obsidian is a form of volcanic glass that has no crystals or crystalline structure.
HEAT TREATMENT:
Obsidian is not heat treated.
SOURCE:
The illustrated specimen was recovered from the base of the Obsidian Cliff Locality, Yellowstone National Park, Wyoming.
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