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Revision as of 06:50, 20 May 2003 by Smack (talk | contribs)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)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.