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| '''Pumice''' is a porous type of ]. It is considered a ] 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 ]. It is widely used as an ] for ] purposes. | '''Pumice''' is a porous type of ]. It is considered a ] 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 ]. It is widely used as an ] for ] purposes. | ||
Revision as of 06:50, 20 May 2003
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.