The vesicles are actually gas bubbles that were trapped in the rock during the rapid cooling of a gas-rich frothy magma. The material cools so quickly that atoms in the melt are not able to arrange themselves into a crystalline structure. Thus, pumice is an amorphous volcanic glass known as a mineraloid.
Background: Pumice is a type of extrusive volcanic rock, produced when lava with a very high content of water and gases (together these are called volatiles) is extruded (or thrown out of) a volcano. As the gas bubbles escape from the lava, it becomes frothy. Pumice and obsidian are often found together. In commerce, pumice is the term applied to larger pumice stones, while pumicite consists of fine grains or ash. Pozzolan is a fine-grained pumicious material (both natural and man-made), which combines with lime to make a smooth, plaster-like cement. 6. You can remove body hair with a pumice stone. Soak a pumice stone in warm water for about 5 minutes. Lather skin with soap. Gently rub the pumice stone on skin in small circular motions for 1-2 minutes. Rinse off the soap and dry skin. Be sure to use lotion after hair removal. Hair Removal. You can remove body hair with a pumice stone. Soak a pumice stone in warm water for about 5 minutes. Lather skin with soap. Gently rub the pumice stone on skin in small circular motions for 1-2 minutes. Rinse off the soap and dry skin. Allow it to completely dry out. Set the pumice stone in a dry place so that it doesn't stay damp in between uses. Some pumice stones come with a string attached that allows you to hang the stone to dry. If you let the stone stay wet, bacteria could grow in the pores, making it unsafe to use. 1 Since the pumice stone will wear down slightly while you use it, you may need to turn it over to get a fresh surface you can use to exfoliate your skin. 2  Rinse the pumice stone often to keep its surface clean and effective. Pumice is a light-colored, extremely porous igneous rock that forms during explosive volcanic eruptions. It is used as aggregate in lightweight concrete, as landscaping aggregate, and as an abrasive in a variety of industrial and consumer products. Pumice is produced in two forms: rock pumice and pumicite. Pumicite is a name given to very fine grained pumice (less than 4 millimeters in diameter down to submillimeter sizes). Pumice stone is a light porous acid volcanic rock having the composition of rhyolite, used for scouring &, in powdered form, as an abrasive & for polishing. report this answer. Updated on Monday, February 06 2012 at 08:30AM EST. Source: dictionary.reference.com/...  Pumice /ˈpʌmɨs/ , called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesicle walls and being dark colored and denser. Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization. It is commonly, but not exclusively of silicic or felsic to intermediate in composition (e.g., rhyolitic, dacitic, andesite, pantellerite, phonolite, trachyte), but basaltic and other compositions are known. Pumice is commonly pale in color, ranging from white, cream, blue or grey, to green-brown or black. Use it to remove hair. The ancient Greeks used pumice to remove body hair, and some still use it for this purpose. Pumice makes a gentle natural hair remover. Soak your skin in the bath or in a shower until it's warm and soft. Wet the pumice stone, then rub your skin using a gentle circular motion. 1 Since the pumice stone will wear down slightly while you use it, you may need to turn it over to get a fresh surface you can use to exfoliate your skin. 2  Rinse the pumice stone often to keep its surface clean and effective. The vesicles are actually gas bubbles that were trapped in the rock during the rapid cooling of a gas-rich frothy magma. The material cools so quickly that atoms in the melt are not able to arrange themselves into a crystalline structure. Thus, pumice is an amorphous volcanic glass known as a  mineraloid . Pumice is produced in two forms: rock pumice and pumicite. Pumicite is a name given to very fine grained pumice (less than 4 millimeters in diameter down to submillimeter sizes).
http://www.mineralseducationcoalition.org/minerals/pumice http://www.onegoodthingbyjillee.com/2015/05/10-handy-household-uses-for-a-pumice-stone.html http://www.wikihow.com/Use-a-Pumice-Stone http://geology.com/rocks/pumice.shtml http://www.kgbanswers.com/where-do-pumice-stones-come-from/20681071 https://en.wikipedia.org/wiki/Pumice http://www.wikihow.com/Use-a-Pumice-Stone http://geology.com/rocks/pumice.shtml
where do pumice stones originate