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Pumice

Top stone is obsidian, below that is pumice
and in lower right hand color is rhyolite (light color)
larger version

Pumice is a porous type of igneous rock. It is considered a glass because it has no crystal structure. Pumice varies in density according to the thickness of the solid material between the pores; some samples float in water. It is widely used as an abrasive for cosmetic purposes.

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