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| <div style="float:right;margin-left:0.5em;text-align:center"> | |||
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| <small>''Top stone is ], below that is pumice<br> and in lower right hand color is ] (light color)''</small><br> | |||
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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. | |||
Revision as of 16:36, 8 October 2003
File:Different rocks at Panum Crater-300px.jpg
Top stone is obsidian, below that is pumice
and in lower right hand color is rhyolite (light color)
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.