PUMICE

pŭmˈĭs, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth. The viscosity of the lava, the quantity of water vapor and gas, and the rate of cooling together determine the fineness of the vesicular substance. Large amounts of gas result in a finer-grained variety known as pumicite. The chemical composition is that of granite. Coarser-grained rock, with fewer and larger air spaces, is called scoria; it is usually associated with dark-colored igneous rocks of diorite or gabbro composition. Pumice is used chiefly as an abrasive and is included in many scouring preparations. Ground pumice is also used in finishing furniture. Deposits are found in volcanic areas throughout the world. Because of its air chambers, pumice has a very low density and has been observed blowing off volcanic islands in strong winds. It usually floats and can be carried great distances by ocean currents.

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The Columbia Encyclopedia, Sixth Edition Copyright© 2004, Columbia University Press. Licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

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Questia Books and Articles on: Pumice
We found: 1483 results
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books on: Pumice  - 939 results

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1.
Lothagam: The Dawn of Humanity in Eastern Africa
Book by Meave G. Leakey, John M. Harris; Columbia University Press, 2003
Subjects: Animals, Fossil--Kenya--Lothagam Site, Lothagam Site (Kenya), Paleontology--Miocene, Vertebrates, Fossil--Kenya--Lothagam Site
...as 11 crystals were measured from each pumice clast, and the results will be discussed...representative example. Eleven feldspars from pumice K91-4710(B) yielded a nearly concordant...Ten feldspar crystals measured from pumice 93- 1020(A) form an essentially concordant...
2.
The Origins of the First New Zealanders
Book by Douglas G. Sutton; Auckland University Press, 1994
Subjects: Maori (New Zealand People)--History, Maori (New Zealand People)--Migration, Maori (New Zealand People)--Origin, Maori Language--History, Navigation, Prehistoric--Polynesia
...stratigraphy Sea-rafted pumices The sea-rafted pumice layers have proved most...important sea-rafted pumices are Taupo Pumice Healy et al. 1964...in the hand. Loisels Pumice is similar to two older pumices. Both are grey with...
3.
Thera in the Bronze Age
Book by Phyllis Young Forsyth; Peter Lang, 1997
Subjects: Akroterion (Greece)--Antiquities, Bronze age--Greece--Thera, Thera Island (Greece)--Antiquities, Volcanoes--Greece--Thera Island
...Thera possessed a valuable commodity of its own: pumice. The usefulness of pumice in antiquity is well known: as P. Faure pointed out at the First International Congress, pumice was commonly employed as an all-purpose abrasive...
4.
Volcanoes: An Introduction
Book by Alwyn Scarth; UCL Press, 1994
Subjects: Volcanoes
...the most important developed the Lower Pumice caldera about 100000 years ago. Flooded...high, that almost enclosed the Lower Pumice caldera. Thus, the southern part of...distributed hot, coarse rose rhyodacitic pumice that reaches 6m in thickness. The second...
5.
Living Religions of the World
Book by Frederic Spiegelberg; Prentice-Hall, 1956
Subjects: Religion--Philosophy, Religions
of Being permeates all things as moisture permeates pumice. It does not change the nature of pumice, it is not in itself in any way connected with the nature of pumice, and the pumice retains it only as it passes through. Yet it...
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journal articles on: Pumice  - 109 results

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1.
Clinker, Pumice, Scoria, or Paralava? Vesicular Artifacts of the Lower Missouri Basin
Journal article by Mark B. Estes, Lauren W. Ritterbush, Kirsten Nicolaysen; Plains Anthropologist, Vol. 55, 2010
Subjects: Colleges & universities, Comparative analysis, Data collection, Historic documents, Missouri River, Rivers, Stone
Clinker, Pumice, Scoria, or Paralava? Vesicular Artifacts...archaeological site reports as clinker, pumice, scoria, pseudoscoria, and floatstone...region Table I) have been referred to as "pumice" (Hill and Wedel 1936:47), suggesting...
2.
Plant Succession on Pumice at Mount St. Helens, Washington
Journal article by Roger Del Moral; The American Midland Naturalist, Vol. 141, 1999
Subjects: Botany, Flowers & plants, Lava, Mount St Helens, Volcanoes, Washington
Plant Succession on Pumice at Mount St. Helens, Washington by...1982). This eruption formed deep pumice deposits on the north slope that entrained...are characterized by fine decomposing pumice. Nearby, a smooth barren pumice plain...
3.
Precise ^sup 40^ar/^sup 39^ar Geochronology for the Upper Koobi Fora Formation, Turkana Basin, Northern Kenya
Journal article by Ian McDougall, Francis H. Brown; Journal of the Geological Society, Vol. 163, 2006
Subjects: Basins, Geological time, Geology, Kenya, Rocks, Sediments, Turkana Basin, Volcanoes
...52.16E. 93-1062A, B; Pumice clasts, Middle Nariokotome...53.10E. 98-336A, B: Pumice clasts, Lower Nariokotome...south of Nariokotome Laga. Pumices at base of tuff dipping about...39E. 93-1060, 93-1061: Pumice clasts, Lower Nariokotome...
4.
Geochronology of the Pre-kbs Tuff Sequence, Omo Group, Turkana Basin
Journal article by Ian McDougall, Francis H. Brown; Journal of the Geological Society, Vol. 165, 2008
Subjects: Geology, Sediments, Single crystals, Standard deviation, Stratigraphy
...from four of these pumices and from a pumice in the correlative...composite of 14 small pumices. 00-301A, B (K00-6149). Pumice clasts up to c...separated from four pumices for each sample analysed...B; 02-014. Pumice clasts c. 5 cm across...
5.
Numerical Age Control for the Miocene-pliocene Succession at Lothagam, a Hominoid-bearing Sequence in the Northern Kenya Rift
Journal article by Ian McDougall, Craig S. Feibel; Journal of the Geological Society, Vol. 156, 1999
Subjects: Geological time, Geology, Kenya, Plate tectonics
...the surface of the pumices, they were individually...Feldspars from each pumice were maintained as...feldspars from each pumice, and this average...results from other pumices from the same stratigraphic...data for individual pumices or stratigraphic...results from each pumice have been plotted...
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magazine articles on: Pumice  - 129 results

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1.
Mining the Sacred Mountains
Magazine article by Gary Ghioto; E, Vol. 11, January 2000
Subjects: Arizona Tufflite of Glendale--Management, Mountains--Religious aspects, Sacred space--Arizona, Tunneling--Planning, White Vulcan Pumice Mine, Arizona--Management
...Peaks are also home to the White Vulcan Pumice Mine, a U.S. Forest Service-permitted...jeans, which are processed with white pumice stone extracted there. The mine owners...and then using bulldozers to remove the pumice deposits. The companys operations have...
2.
Chicken Little Was Right - Sometimes the Sky Does Fall
Magazine article by Katharine Cashman; Phi Kappa Phi Forum, Vol. 86, Winter 2006
Subjects: Geological time, Geology, Mountains, Volcanoes
...Cascade peaks, barren lava flows, and pumice deposits dominate the scenery. It is...a high eruption column that deposited pumice and ash to the east. Explosive activity...then followed, its high column spreading pumice and ash over much of the western United...
3.
How to Find the Right Potting Mix
Magazine article by Lauren Bonar Swezey; Sunset, Vol. 196, June 1996
Subjects: Flowers & plants, Gardens & gardening, Soils
...forest products," sand, perlite, pumice, dolomite limestone, and a wetting agent...why mixes should also contain perlite or pumice. The best bark for potting mixes is composted...potentially harmful to sensitive plants. PUMICE, PERLITE, AND SAND These ingredients...
4.
The Sacred and the Stonewashed
Magazine article by Marilyn Berlin Snell; Sierra, Vol. 85, November 2000
Subjects: Flagstaff, Arizona--Environmental aspects, James, Sammy M.--Conduct of life, Navajos--Conduct of life, Preston, Bucky--Conduct of life
...additional 30 acres to tack onto its 90-acre pumice-mining operation along the eastern flank...special, distinct value." The main use of pumice is for stone-washing denim. Native...global craze for the lived-in look made pumice a hot commodity for the fashion industry...
5.
The Pines of Chemult
Magazine article by Herb McLean; American Forests, Vol. 104, Spring 1998
Subjects: Chemult Oregon, Deserts, Forestry, Trees
...mountains, even the roads. "Its volcanic pumice and the red comes from high iron content...stalwart ponderosas grow brazenly out of the pumice less than five miles to the northeast...With 30 to 60 feet of nearly sterile pumice below those pines, "daytime ground temperatures...
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newspaper articles on: Pumice  - 294 results

       More newspaper Results: 1-10 11-20 21-30 31-40 41-50 >>  
 
1.
Has the Real Atlantis Finally Been Found ... under a Modern Holiday Paradise? Archaeologists Unearth Tantalising Evidence of a Lavish Ancient Civilisation Destroyed in a Few Terrifying Days
Newspaper article; The Daily Mail (London, England), June 9, 2010
Subjects: Archaeology
...centre of the island comes a plume of pumice and ash, a staggering 35km high. One...buried under 30metres of solid ash and pumice -- what many have described as a Bronze...buried deep under up to 100meters of pumice and ash as the sea boiled and rushed into...
2.
Has the Real Atlantis Finally Been Found. under a Modern Holiday Paradise? Archaeologists Unearth Tantalising Evidence of a Lavish Ancient Civilisation Destroyed in a Few Terrifying Days
Newspaper article; The Daily Mail (London, England), May 31, 2010
Subjects: Archaeology
...centre of the island comes a plume of pumice and ash, a staggering 35 kilometres high...buried under 30 metres of solid ash and pumice -- what many have described as a Bronze...buried deep under up to 100 meters of pumice and ash as the sea boiled and rushed into...
3.
Greasy Stains on Your Ugg Boots? Ants in the Kitchen? Try Aggie's VERY Unlikely Natural Solutions
Newspaper article; The Daily Mail (London, England), June 10, 2010
...chemicals to keep our homes spick and span? PUMICE to remove marks from porcelain and enamel DAMPEN a bog-standard pumice stone, the type you buy in a chemist...and it disappears before your eyes. pumice is the perfect hardness, so it breaks...
4.
Greasy Stains on Your Ugg Boots? Ants in the Kitchen? Try Aggie's VERY Unlikely Natural Cleaning Solutions
Newspaper article; The Daily Mail (London, England), June 10, 2010
...chemicals to keep our homes spick and span? PUMICE to remove marks from porcelain and enamel DAMPEN a bog-standard pumice stone, the type you buy in a chemist...and it disappears before your eyes. Pumice is the perfect hardness, so it breaks...
5.
Spending a Night atop a Volcano: Climbing Stromboli
Newspaper article; Daily Herald (Arlington Heights, IL), June 25, 2006
...were foot-high curved walls of stacked pumice stone - some just a wind-blocking curl...carrying with it microscopic particles of pumice, forcing the hard dust into my ears...scrubbing in the hotel room sink could get the pumice out of our jeans. We left them stuffed...
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encyclopedia articles on: Pumice  - 12 results

       More encyclopedia Results: 1-10 11-12 >>  
 
1.
Pumice
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
PUMICE pum is, volcanic glass formed by the solidification...rocks of diorite or gabbro composition. Pumice is used chiefly as an abrasive and is included in many scouring preparations. Ground pumice is also used in finishing furniture. Deposits...
2.
Lava
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...flow if bubbles solidify before the gas can escape. Light-colored, glassy froth is pumice ; dark, cindery or slaggy froth, of a coarser texture than pumice, forms what is known as scoriae. Lava flows which solidify as a mass of blocks and...
3.
Italy
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...minerals produced are petroleum (especially in Sicily), lignite, mercury, zinc, potash, marble, barite, asbestos, and pumice. There are also large deposits of natural gas (methane), and much hydroelectricity is generated. Italy, however, is still...
4.
Parchment
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...in water, treated with lime to loosen the hair, scraped, washed, stretched, and dried, and then rubbed with chalk and pumice stone. A fine grade prepared from the skin of the calf or kid became known as vellum, a name applied during the Middle Ages...
5.
Oilcloth
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
...or burlap, sized with glue, and coated with a thick oil paint, several coats being used and successively rubbed down with pumice stone. It was machine printed, dried in a drying room, varnished, and rolled. Linoleum and various kinds of vinyl products...
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