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Although vermiculite is not toxic, there are some concerns about breathing in fine particles of dust. Much of vermiculite toxicity is associated with asbestos. Accessed May 24, 2010. Clean, sterile, non-toxic, and odorless; Vermiculite and Square Foot Gardening. Calcium silicate boards: exfoliated vermiculite is added to a calcium silicate slurry. If your home was built before 1990, you might have vermiculite insulation in your walls or attic. If you think your pet has eaten something potentially toxic, call Pet Poison Helpline or … Modern spray applied fireproofing today is made with various light weight aggregates that does not contain asbestos and is carefully monitored at all stages of mining and production to ensure this is the case. Asbestos is harmful and can cause lung cancer and other diseases if inhaled. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. It will not absorb moisture from the inside of stored tubers, but it does take up free water from the outside, preventing storage rot. In hydroponics, vermiculite is commonly used in a 50/50 mix with perlite. Although not all vermiculite contains asbestos, some products were made with vermiculite that contained asbestos until the early 1990s. The former vermiculite mine in Libby, Montana, did have tremolite asbestos as well as winchite and richterite (both fibrous amphiboles)—in fact, it was formed underground through essentially the same geologic processes as the contaminants. vermiculite is a rock. Vermiculite was mined in Libby, Montana, from the 1920s until the mine closed in 1990. By itself, From 1925 to 1990, vermiculite ore mined near Libby, Mont., accounted for more than half of the global production and supply. In 2014, South Africa, Brazil, the US, and China were the top producers of mined, concentrated and unexfoliated vermiculite, with about 90% world share. For more information, contact The Vermiculite Association at 717-238-9902 or via email to [email protected]. [16] The United States government is also pursuing criminal charges against several former executives and managers of the mine for allegedly disregarding and covering up health risks to employees. Most vermiculite products use the exfoliated mineral and fall into one of three categories: lightweight aggregates, insulation, and horticultural and agricultural products. Mining operations at the Libby site stopped in 1990 in response to asbestos contamination. • Use other soil additives such as peat, sawdust, perlite, or bark. Sizes of vermiculite products range from very fine particles to large (coarse) pieces nearly an inch long. Mel Bartholomew, author of Square Foot Gardening, describes vermiculite this way, “As you probably know it holds water yet drains when it’s filled, just like a sponge does. Vermiculite has been used in building insulation, potting soil and fertilizer. Vermiculite is a non-toxic mineral that will not deteriorate in your soil, so its effects last for a long time. It’s said that 75% of vermiculite supplies came from Montana and are contaminated with toxic amphibole asbestos. Up to 85 percent of all vermiculite insulation in the U.S. came from a mine in Libby, Montana, sold under the name Zonolite. Also, because vermiculite has excellent ion-exchange properties, it absorbs excess nutrients and slowly releases them to a plant's root hairs. For example, palabora vermuculite. Root vegetables like carrot, radish, potatoes, beets, onion and garlic will all need the additional drainage. While in operation, the Libby mine may have produced 80% of the world's supply of vermiculite.[9]. With new seed growth, vermiculite's aeration properties along with its absorbent nature makes it an ideal medium for seed germination. Came home to see my dog had eaten horticulture vermiculite from one of the dog-safe plants. Cites Emergency in Asbestos-Poisoned Town, General Chemistry II Laboratory: Some Examples of Chemical Equilibria: Le Châtelier's Principle, Petition for writ of certiorari to U.S. Supreme Court (April 27, 2006), https://en.wikipedia.org/w/index.php?title=Vermiculite&oldid=1021406568, Short description is different from Wikidata, Articles needing additional references from March 2015, All articles needing additional references, Wikipedia articles needing clarification from December 2012, Creative Commons Attribution-ShareAlike License, Colorless, white, yellow, green, brown, black, As large crystalline plates to clay-sized particles; lamellar to scaley, Greasy or vitreous (pearly at cleavage planes). The article stated that there had been a cover-up by W. R. Grace and Company and others regarding the health risks associated with vermiculite and that several sites in the Salt Lake Valley had been remediated by the EPA when they were shown to be contaminated with asbestos. The content of this page is not veterinary advice. A number of factors (amount of substance ingested, size of the animal, allergies, etc.) The veins of this toxic and extremely friable form of asbestos-contaminated most, if not all, of the vermiculite taken from the Libby mine. These dispersions can be used to make vermiculite 'paper' sheets by pouring them onto a piece of smooth, low surface-energy plastic, and allowing to dry. Is Vermiculite Safe to Use? It can also lead to lung cancer, recurrent pneumonia and an asbestos-related cancer known as malignant mesothelioma. Exfoliation occurs when the mineral is heated sufficiently, and commercial furnaces can routinely produce this effect. This mineral compound is formed by the weathering and transformation of the minerals biotite and phlogopite. Exposure to asbestos is the main cause of mesothelioma, an aggressive and deadly cancer. Avoid washing vermiculite-covered clothing with the family wash. AP Feature on Libby, MT: "For asbestos-ravaged town, questions persist." In the past, vermiculite from the W. R. Grace mines in Libby, Montana, have been associated with asbestos. Because there is no firm “cut-off” date for asbestos-contaminated vermiculite insulation, treat all vermiculite insulation as if it contains asbestos. An article published in The Salt Lake Tribune on December 3, 2006, reported that vermiculite and Zonolite had been found to contain asbestos, which had led to cancers such as those found in asbestos-related cases. It also occurs in carbonatites and metamorphosed magnesium-rich limestone. The resulting sheet can then be peeled off the plastic. 27, 1981 - 81.10(o). Its unique shape traps water … When working with vermiculite, it’s always best to use a protective face mask. but any vermiculite on a store shelf these days should not contain asbestos. The United States decided to ban the sale of this insulation in 1978. South Africa's production is decreasing, while Brazil's is significantly increasing. Some vermiculite exfoliators blend with lower-cost perlite also. According to the Centers For Disease Control, prolonged exposure to asbestos can lead to asbestosis, an inflammation of the chest cavity also known as pleurisy. Gardening With Vermiculite - Vermiculite Uses And Information Vermiculite was first described in 1824 for an occurrence in Millbury, Massachusetts. [15] In October 2006, W. R. Grace and Company tried to appeal the fines ($54.5 million) levied on them from the EPA, but the Supreme Court rejected the appeal. Vermiculite mined near Libby, Montana, which accounted for more than half the worldwide production of vermiculite from 1925 to 1990, was … Vermiculite itself is not toxic and is safe to use. And so vermiculite was said to be dangerous. [11] Numerous people were knowingly[12] exposed to the harmful dust of vermiculite that contained asbestos. This dust is known as silica. There are still vermiculite deposits in Texas, Colorado, Nevada, North Carolina and Wyoming. Large commercial vermiculite mines currently exist in the United States of America, Russia, South Africa, China, and Brazil. vermiculite from one particular mine was found to contain asbestos years ago. Vermiculite is a naturally occurring mineral that is perfectly safe when pure. Pure vermiculite does not contain asbestos and is non-toxic. By itself, vermiculite is not considered toxic, but the mineral does produce a dust that can cause asthma and allergies. Associated mineral phases include: corundum, apatite, serpentine, and talc. Made sure the plant was safe, but did not think the dog would eat the mineral in the potting soil. Nevertheless, homes or structures containing vermiculite or vermiculite insulation dating from before the mid-1990s—and especially those known to contain the "Zonolite" brand—may contain asbestos, and therefore may be a health concern. While some end processors and exfoliators of vermiculite specialize, with proprietary products sold in a wide variety of industries, some have more varied end products, with less stringent technical requirements. During the mining process, asbestos and asbestos fibers were mined and mixed with vermiculite. Vermiculite is a naturally occurring mineral whose thin, shiny layers and appearance resembles mica. If you'd rather not use vermiculite, consider clay pebbles, a renewal medium, which improves water retention and nutrient circulation in soil. White or yellowish, translucent, shiny, light-brown or greenish in color, in some cases. ----- Vermiculite is a natural substance The product used in popcorn ceilings is called vermiculite and is actually a natural substance found in environments where asbestos is also sourced. Once dry, the clean-up task to remove excess vermiculite begins. W. R. Grace and Company has vigorously denied these charges. Molded shapes: this process involves mixing exfoliated vermiculite with inorganic bonding agents such as. Vermiculite is a 2:1 clay, meaning it has two tetrahedral sheets for every one octahedral sheet. In the United States, imported vermiculite comes primarily from two countries--South Africa and China. Its name is from Latin vermiculare, "to breed worms", for the manner in which it exfoliates when heated. Vermiculite is a naturally occurring mineral whose thin, shiny layers and appearance resembles mica. [14][15] The EPA has spent $120 million in Superfund money on cleanup. Vermiculite can be a health hazard if not handled properly. This is then dewatered by pressing or by using one of the Fourdriner/Magnani/Hatschek processes to form a flat board which is then heat cured under pressure (typically 10–15 bar) for periods of up to 24 hours. Centers For Disease Control: What is Vermiculite? The ingestion of larger amounts might lead to iron-related toxicity … Top of Page. Bush, in Encyclopedia of Materials: Science and Technology, 2001 2.2 Vermiculite. In its post-heated form, vermiculite is light weight, absorbent and versatile. Inhaling perlite dust could trigger asthma in sensitive individuals (including dogs), and if … Because of its potential contamination with asbestos, it can be dangerous if inhaled. Yet, knowing the human health risks, the mining company still continued to operate there until 1990. While in operation, the mine in Libby produced most of the world’s supply of vermiculite. Plan the perfect garden with our interactive tool →. I couldn’t find any information on Vermiculite at the Pet Poison Helpline site but Wikipedia states that “Pure vermiculite does not contain asbestos and is non-toxic.” [17] Jury selection was to have been completed in February 2009. Vermiculite doesn’t deteriorate or rot, its mold-resistant, odorless, sterile, and non-toxic. Used in in-ground swimming pools to provide a smooth pool base: Finer grades of exfoliated vermiculite plus Portland cement may be combined either on-site or in a factory premix to provide a base for swimming pool vinyl liners. Consequently, many of the former miners and residents of Libby have been affected and continue to suffer health problems. Less amounts come from Russia, Australia, Zimbabwe, Brazil and Japan. Since it does not break down, it is not useful as a source of nutrients. The average time frame for asbestos-related lung conditions to occur is 20 to 40 years after the first exposure. [2] Much of vermiculite toxicity is associated with asbestos. [4][2], It typically occurs as an alteration product at the contact between felsic and mafic or ultramafic rocks such as pyroxenites and dunites. Vermiculite poses health problems if you BREATHE the dust from it; it (and all other silica and / or silica type dusts) can cause chronic silicosis after extended periods of inhalation, which is so similar to lung cancer that many folks are lobbying to have these substances listed as … As a gardening supplement, vermiculite in compost creates a light, open compost that holds more water and allows more time between watering. Vermiculite has a long history of use in gardening, commercial horticultural uses, and construction. Another mineral compound, perlite has a highly porous quality that balances well with vermiculite's absorbent, yet light features. [20] On June 17, 2009, the EPA issued a public health emergency in and near Libby, thereby allowing federal agencies to provide funding for health care, and for removal of contaminated insulation from affected homes. Some Vermiculite Is Safe Title: Microsoft Word - FAQ-FINAL VERSION - August 2015 According to the Centers For Disease Control, prolonged exposure to asbestos can lead to asbestosis, an inflammation of the chest cavity also known as pleurisy. All plants need good drainage, but certain vegetables will do better with really loose and aerated soil. The largest and oldest vermiculite mine in the United States was started in the 1920s, at Libby, Montana, and the vermiculite was sold under the commercial name Zonolite. The vermiculite we use in the garden undergoes a heat treatment process that expands the material into pellets made of layers of thin plates. If you're handling vermiculite alone, use protective hand and face barriers. Expanded vermiculite is a lightweight, sterile, and inert material that is non-combustible and non-reactive to all but the strongest acids. Fertilizer consumption can lead to serious gastrointestinal problems for a pet. Unfortunately, the mine had been operating since the 1920s, and environmental and industrial controls were virtually non-existent until the mine was purchased by the W. R. Grace and Company in 1963.

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