Pumice
Porous Volcanic Rock
Chemistry
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Volatiles
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Links to Other Materials
- Volcanic Ash - Related
- Cache
Miscellaneous
- Family: None
- Region: North America
- Mined At: Unspecified
- Raw Mineral: Yes
- Generic: Yes
Notes
(Richard Willis)
Volcanic rock, which has a molecular composition very similar to granite, yet is closer to the chemistry and behavior of obsidian than basalt. Essentially of rocky porous vitrifications, with (often) embedded sanidine, hornblende, and pyroxene. Coarser-grained rock, with fewer and larger air spaces, is called scoria, and is usually associated with dark-colored igneous rocks of diorite or gabbro composition.
Pumice is a volcanic glass formed by the solidification of lava that is permeated with gas bubbles as associated with richly gaseous volcanic eruptions and is usually found at the surface of a lava flow.
Also called pumice stone, though not to be confused with the stone of the calcareous cemented ash often termed volcanic tuff.
Pumice is easily crushed and milled, and, though pumicite (the ash) is usually preferred, it can be used as simply a silica frit or more precisely as a high-silica feldspar frit.
The finer grained variety of pumice emitted by eruptions in billows as an ash, and usually termed 'volcanic ash', is known as pumicite.
URLs
- Wikipedia definition - http://en.wikipedia.org/wiki/Pumicite
Suppliers
- Univar USA, Inc.
Authors
- Richard Willis (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Pumice" descrip="Porous Volcanic Rock" generic="1" rawmineral="1" searchkey="CINDERSTONE" loi="0.00">
<regions>
<region name="North America"/>
</regions>
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.700" tolerance=""/>
<oxide symbol="K2O" name="Potassium Oxide" status="" percent="7.800" tolerance=""/>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="1.800" tolerance=""/>
<oxide symbol="TiO2" name="Titanium Dioxide, Titania" status="" percent="0.500" tolerance=""/>
<oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="11.500" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="72.700" tolerance=""/>
<oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="1.200" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="3.800" tolerance=""/>
</volatiles>
<references>
<reference name="seealso" reason=""/>
</references>
<suppliers>
<supplier name="Univar USA, Inc." country="US" url="http://www.univarusa.com/" label=""/>
</suppliers>
<notes>
<note>Volcanic rock, which has a molecular composition very similar to granite, yet is closer to the chemistry and behavior of obsidian than basalt. Essentially of rocky porous vitrifications, with (often) embedded sanidine, hornblende, and pyroxene. Coarser-grained rock, with fewer and larger air spaces, is called scoria, and is usually associated with dark-colored igneous rocks of diorite or gabbro composition.
Pumice is a volcanic glass formed by the solidification of lava that is permeated with gas bubbles as associated with richly gaseous volcanic eruptions and is usually found at the surface of a lava flow.
Also called pumice stone, though not to be confused with the stone of the calcareous cemented ash often termed volcanic tuff.
Pumice is easily crushed and milled, and, though pumicite (the ash) is usually preferred, it can be used as simply a silica frit or more precisely as a high-silica feldspar frit.
The finer grained variety of pumice emitted by eruptions in billows as an ash, and usually termed \'volcanic ash\', is known as pumicite.
</note>
</notes>
</material>
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