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black, bluish, mahogany, ...
Glassy, fresh igneous rocks not otherwise classified

Visit for gemological information about Obsidian.

Classification of Obsidian

Mineralogy of Obsidian

Essential minerals - these are minerals that are required within the classification of this rock:
GlassAn amorphous, homogeneous material with a random liquid-like structure generally formed due to rapid cooling.

Physical Properties of Obsidian

Diaphaneity (Transparency):
black, bluish, mahogany, golden, peacock, etc. - the colors due largely to refraction by microscopic bubbles (and microscopic mineral inclusions such as magnetit in "Rainbow Obsidian").

Other Names for Obsidian

Name in Other Languages:
Simplified Chinese:火山玻璃

Internet Links for Obsidian URL:
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