Obsidian

Obsidian is a naturally occuring glass which is formed by volcanic material rapidly cooling.

List of Obsidians

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a piece of obsidian

Description:   One edge of the glassy shard is sharp enough to cut an unwary finger. Dim outlines of shapes beyond can be seen through the translucent stone, cast into shadow by the jet black hue.

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a piece of spiderweb obsidian

Description:   Delicate white lines spread over the small piece of volcanic glass in a pattern similar to an orb weaver's graceful web. The pale tendrils are opaque, contrasting with their translucent black background.