This is an old revision of this page, as edited by Mav (talk | contribs) at 06:44, 23 September 2003 (photo). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 06:44, 23 September 2003 by Mav (talk | contribs) (photo)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)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.