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Topic: Vermiculite


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In the News (Mon 21 Dec 09)

  
  Vermiculite
Vermiculite is a natural mineral which expands with the application of heat.
Expanded Vermiculite is used as a soil conditioner[?], as loose-fill insulating and packing material, as an insulating filler for plaster[?] and concrete compounds, and as a carrier for dry handling and slow release of agricultural chemicals.
Vermiculite is often used together with Perlite as a growing medium for hydroponics.
www.ebroadcast.com.au /lookup/encyclopedia/ve/Vermiculite.html   (120 words)

  
 Vermiculite Mineral,Vermiculite Information,Vermiculite Properties,Vermiculite Suppliers
Vermiculite plaster is widely used for better acoustics and reduction of noise in auditoriums, wireless studios, theatres, hospitals etc. Vermiculite mixed with three parts of gypsum is used as plaster for sound-absorbing purposes.
The upper portion of altered pyroxenite is vermiculite and the lower portion of altered pyroxenite is vermiculite and the lower portion is biotite.
Vermiculite is mined in the Urals where it is found in association with dunite and pyroxenite intrusions which are widely known as a source of platinum.
www.mineralszone.com /minerals/vermiculite.html   (1545 words)

  
 About Vermiculite
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-ironsilicate which resembles mica in appearance.
Vermiculite mines are surface operations where ore is separated from other minerals, and then screened or classified into several basic particle sizes.
The bulk density of crude vermiculite or vermiculite concentrate is in the range of 640-1120 kg/m³ (40-70 lb/ft³) and exfoliated or expanded vermiculite is in the range of 64-160 kg/m³ (4-10 lb/ft³).
www.vermiculite.org /aboutvermiculite.htm   (219 words)

  
 Vermiculite   (Site not responding. Last check: 2007-10-08)
Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminium-iron silicate which resembles mica in appearance.
Vermiculite mines are surface operations where ore is separated from other material, then screened or classified into several basic particle sizes.
The bulk density of crude vermiculite or vermiculite concentrate is in the range of 640-1120 kg/cubic metre.
www.vermiculite.com.au   (241 words)

  
 Vermiculite Attic Insulation from Pillar to Post
If you have Vermiculite insulation, there is no way to know if it came from the Libby mine but there is a very good chance that it did since most of the worlds supply came from that mine.
Vermiculite is a mineral that exists in the earth.
Vermiculite is shaped like little nuggets and may be silver, gold or brown in color.
tradewindsrealty.com /nsblog/B755003278/C1469921293/E20060416113524   (1141 words)

  
 Human Health Hazards -- Asbestos in Vermiculite Insulation
Vermiculite is still mined and distributed for a number of uses, including insulation.
Vermiculite mined today for use in insulation is from a source considered to be free of asbestos contamination.
Vermiculite is ideal for attic insulation because of it’s properties as a lightweight, fire-resistant, absorbent and odorless material.
www.dhfs.state.wi.us /eh/HlthHaz/fs/Vermiculite.htm   (1019 words)

  
 Vermiculite Insulation
Vermiculite from Grace's mine at Libby, Mont., was sold for use in garden products, fireproofing, cement mixtures and more than a dozen other consumer products.
Vermiculite insulation is easily distinguished from the much more common types of loose fill insulations - cellulose, fiberglass and rock wool.
In contrast vermiculite is in the form of brownish-pink or brownish-silver accordion-shaped chips.
www.dspinspections.com /vermiculite_insulation.htm   (648 words)

  
 ATSDR - Vermiculite Consumer Products Fact Sheet
Vermiculite is a naturally occurring mineral compound composed of shiny flakes, resembling mica.
Vermiculite was also used in fireproofing materials, gypsum wallboard, and as a lightweight aggregate in construction materials.
Expanded vermiculite is shaped like a small nugget and varies in color from silver-gold to gray-brown.
www.atsdr.cdc.gov /NEWS/vermiculite051603.html   (1141 words)

  
 TVA - The Vermiculite Association - International vermiculite trade association
Vermiculite is one of the safest, most unique minerals in the entire world.
Vermiculite is used in thousands of applications from potting soils, light weight concrete, fire protection construction materials, intumescent applications, as a UN approved packaging material for the safe shipment of hazardous liquids, texturizers in paints and coatings, and most recently as nanocomposites for films, coatings and barrier applications.
Vermiculite is a GRAS (generally recognized as safe) mineral, and is approved by the United States Food and Drug Administration for use as a carrier of animal feed supplements and nutrients.
www.vermiculite.org   (470 words)

  
 EPA/OPPT/Asbestos - Vermiculite
All vermiculite ores contain a range of other minerals that were formed along with the vermiculite in the rock.
Vermiculite ores from some sources have been found to contain asbestos minerals but asbestos is not intrinsic to vermiculite and only a few ore bodies have been found to contain more than tiny trace amounts.
The study was designed to: (1) obtain a rough estimate of the amount of asbestos in attics with vermiculite attic insulation; and (2) obtain a rough estimate of a person’s exposure to asbestos while performing common household activities.
www.epa.gov /asbestos/pubs/verm.html   (689 words)

  
 Vermiculite - Background, History, Raw Materials, The Manufacturing Process, Health Aspects
The resulting expanded vermiculite granules are usually a gold-brown color with a bulk density of about 4-10 lb/cu ft (64-160 kg/cu m), depending on the size of the granules.
The vermiculite is separated from the surrounding rocks and dirt using various wet or dry techniques depending on the particular mining operation and local environmental regulations.
If the particular vermiculite being mined tends to form a high percentage of large flakes, the flakes may be slightly crushed to delaminate them and reduce their size.
www.madehow.com /Volume-6/Vermiculite.html   (1876 words)

  
 Mineral Information Institute - VERMICULITE   (Site not responding. Last check: 2007-10-08)
Vermiculite is a mineral that belongs to a group of minerals called the mica minerals.
Vermiculite is formed by the alteration and/or weathering of the minerals biotite and phlogopite.
Vermiculite is imported into the United States primarily from two countries: The majority of the imported vermiculite comes from South Africa; with a smaller amount coming from China.
www.mii.org /Minerals/photoverm.html   (388 words)

  
 Vermiculite Asbestos   (Site not responding. Last check: 2007-10-08)
Some of the vermiculite originated at a mine in Libby Montana, and is likely to be contaminated with asbestos.
Vermiculite is easy to spot; it’s a gold/brown loose material, with nuggets clearly showing a layered texture.
Some vermiculite is contaminated with microscopic fibers, invisible even under a magnifying glass.
www.radonpro.com /Vermiculite.htm   (2380 words)

  
 Therm-O-Rock Home of Perlite and Vermiculite
Already mixed with vermiculite as a fertilizer and soil conditioner, this is packed especially for commercial growers.
The soil is a mixture of vermiculite, peat moss, and compost.
This processed vermiculite is made for plaster mixings or for roof deck materials.
www.thermorock.com /vermic.asp   (202 words)

  
 VERMICULITE (Hydrated Magnesium Iron Aluminum Silicate Hydroxide)
Vermiculite is an important member of the Montmorillonite/Smectite Group, members of which also belong to the larger general group known as the Clays.
Vermiculite is also sometimes placed in the Mica Group, although recent analysis has excluded it from this group.
Vermiculite can be used to soak up such toxic liquids as fertilizers, herbicides and insecticides.
mineral.galleries.com /minerals/silicate/vermicul/vermicul.htm   (359 words)

  
 CBC.CA - The National
Vermiculite is a volcanic material compound that expands when it is heated and has the unusual property of expanding into worm-like or accordion-like pieces.
From a third to a half of the vermiculite from this mine was sold as attic insulation from the 1940s until 1984, when its sale by the company was discontinued.
But vermiculite is extremely friable and can release a very high number of asbestos fibres in the air when disturbed even if the concentration of asbestos is considered very low.
www.cbc.ca /national/news/deadly_dust   (2424 words)

  
 Stark County Health Department - VERMICULITE & ASBESTOS
Vermiculite was mined in Libby, Montana, from the 1920's until 1990.
Vermiculite is used in some potting soil for plant growth, and it appears as bright gold or silver flakes.
Vermiculite should not be confused with the white plastic substance also found in many potting soils.
www.starkhealth.org /archives/vermiculite.htm   (637 words)

  
 Vermiculite Insulation and Asbestos - Information for Manitobans | OCMOH | Manitoba Health
Vermiculite is a mineral used in a number of consumer products, including home insulation.
Some vermiculite produced at Libby Mine in Montana from the 1920s until 1990, sold primarily under the brand name Zonolite®, has been found to contain asbestos.
While not all vermiculite produced before 1990 contains asbestos fibres, it is reasonable to assume that if a building has older vermiculite-based insulation, it may contain some asbestos.
www.gov.mb.ca /health/publichealth/cmoh/vermiculite.html   (1063 words)

  
 Vermiculite
Vermiculite, itself, is a mineral, similar to mica, that, after being mined, is milled into ore of various sizes and grades.
The vermiculite, after being expanded, is shaped like small accordion-like pellets, usually gold-brown or metallic in color.
Vermiculite insulation be left undisturbed in your attic.
homepage.mac.com /scottgroup/Vermiculite.htm   (179 words)

  
 Asbestos Vermiculite Plants in Various States
Vermiculite is an ore that can be “popped” or expanded into a lightweight substance used in fertilizers, insulation, and potting soil.
Below is a brief summary of the vermiculite and asbestos situation in some of the states.
Vermiculite is not the only ore that may be contaminated with asbestos.
www.braytonlaw.com /news/mednews/122305_asbestos_michigan.htm   (1789 words)

  
 Vermiculite
Vermiculite is a member of the phyllosilicate group of minerals, resembling mica in appearance.
Palabora vermiculite is basically a hydrated phlogopite mica which has the remarkable ability to expand to many times its original volume when heated, a property known as exfoliation.
Due to its inherent stability, vermiculite is being used increasingly in applications where health and safety are of prime importance.
www.amverco.com /vermicul.htm   (189 words)

  
 Vermiculite
Vermiculite is the geologic name given to a group of hydrated laminar minerals that is aluminum-iron-magnesium silicate and resembles mica in appearance.
Vermiculite has a monoclinic crystalline structure and is relatively soft with a hardness of 2-3 on Mohs scale.
When heated vermiculite becomes exfoliated (expanded) and possesses absorptive, insulating, and ion exchange properties that serve many uses in industries such as, agricultural, ready-mix plaster and cement premixes, and insulation and lightweight concrete aggregate.
www.arrmaz.com /industrialminerals-vermiculite.htm   (290 words)

  
 VITAL STATISTICS: Vermiculite   (Site not responding. Last check: 2007-10-08)
Vermiculite is a volcanic material compound that expands when it is heated and has the unusual property of expanding into worm-like pieces.
Vermiculite a member of the phylosilicate mineral group and is a sheet silicate mineral that is found as flaky crystals.
A vermiculite mine in Montana, USA has been linked to the death of nearly 192 people, and doctors and townsfolk say at least 375 more have been diagnosed with ailments that were likely caused by tremolite asbestos, a rare and extremely toxic form of asbestos released by mining for vermiculite.
www.moles.org /ProjectUnderground/drillbits/5_07/vs.html   (600 words)

  
 It's Your Health - Vermiculite Insulation Containing Amphibole Asbestos
Vermiculite is a mica-like mineral mined around the world and used in a variety of commercial and consumer products because it is fire-resistant and has good insulation qualities.
Of concern is vermiculite ore produced by the Libby Mine in Montana from the 1920's to 1990.
Products made from vermiculite ore produced by the Libby Mine were not widely used after the mid-1980's and have not been on the market in Canada since 1990.
www.hc-sc.gc.ca /iyh-vsv/prod/insulation-isolant_e.html   (1064 words)

  
 Horticultural Perlite and Vermiculite at Home Harvest Garden Supply   (Site not responding. Last check: 2007-10-08)
It's vermiculite is basically a hydrated phlogopite mica which has the remarkable ability to expand to many times its original volume when heated---a property known as exfoliation.
The pH of vermiculite is essentially neutral (7.0-9.5) but owing to the presence of associated carbonate compounds, the reaction is normally alkaline.
Because vermiculite is very light and easy to handle, it easily mixes with soil, peat, composted pine bark and other composted organic materials, fertilizers, pesticides and herbicides.
homeharvest.com /soilamendmentsperlitevermiculite.htm   (927 words)

  
 Vermiculite
The expanded material is used as a lightweight aggregate and insulation in the construction industry, a carrier for fertilizers and a soil conditioner in agriculture, a fragrance carrier, and a filler and texturizer for plastics and rubber.
Vermiculite were observed during mining of iron ore in the 1940’s and 1950’s at Magnet Cove, Hot Spring County.
Residual flake vermiculite originated from the iron-rich mineral biotite in igneous rock, then processes of alteration and weathering created vermiculite.
www.state.ar.us /agc/vermicul.htm   (185 words)

  
 Vermiculite Manufacturers,Friction Dust,Vermiculite Suppliers,Friction Dust Manufacturers,India   (Site not responding. Last check: 2007-10-08)
The presence of vermiculite particles in compost aids aeration, improves moisture retention and promotes the steady release of added fertilizers while the vermiculite itself contributes potassium magnesium and a number of minor elements.
Vermiculite is now extensively used in the friction lining industry as a safe alternative to asbestos.
Vermiculite plasters have several advantages over conventional type of plasters as they are light weight and provide improved coverage, workability, resistance to cracking and shrinkage, reduced thermal conductivity, excellent fire resistance and improved adhesion to a wide range of back grounds.
www.indiamart.com /kumaraswamychemicals   (1155 words)

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