how is crocidolite formed

The percentage of DNA with SSB induced by each form of asbestos was directly related to its iron content. Similarly to the other types of asbestos in the amphibole group, it has long, straight, and friable fibers. But riebeckite has a variety called "crocidolite" that is asbestiform in habit and is a significant percentage of the total tonage of asbestos that is mined annually. /kroh sid l uyt /, n. Mineral. In 1964, Dr Christopher Wagner discovered an association between blue asbestos and the asbestos related cancer mesothelioma. It forms part of a solid-solution series that includes both magnesioriebeckite (formed when iron is replaced by magnesium) and glaucophane (formed when iron is replaced by magnesium and aluminum). The Crocidolite variety is a type of asbestos, and is sometimes also referred to as "blue asbestos". Although crocidolite was the least-often used type of asbestos (about 4 percent of the total used in the U.S.), it’s considered by experts to be the most dangerous form of asbestos. Therefore, individuals in close proximity to airborne crocidolite asbestos are very likely to inhale Crocidolite definition is - a lavender-blue or light green mineral of the amphibole group that occurs in silky fibers and in massive form and is a type of asbestos. lite .krō-'sī-də-.līt, -'sid-ə- n a purplish blue to greenish mineral of the amphibole group that causes asbestosis and cancer in the form of mesotheliomas Crocidolite (blue asbestos) was mined at Wittenoom Gorge in Western Australia from 1937 until 1966. Blue color sets it apart from other asbestiform minerals. It can be also found as a natural contaminant of the chrysotile form of as bestos. riebeckite may form at temperatures as low as 100-150'C and prefers low Eh and relatively low pH conditions. My desk is covered with talismans: pieces of rose quartz, wishing stones from a favorite beach. The other forms of asbestos exposure, including lung cancer and mesothelioma. It is one of six naturally occurring minerals with a silicate base that have been used for commercial purposes. Crocidolite is one of the asbestos minerals, it is also known as the blue asbestos. The name asbestos comes from the Greek and describes the common form of asbestos versions to appear as long thin fibrous crystals. American... Crocidolite - definition of crocidolite by The Free Dictionary . Exposure to very dusty air or long-term exposure to low level airborne dusts containing fine fibres of the mineral has been found to cause a high risk of serious lung disease including mesothelioma and lung cancer. Riebeckite, a sodium-iron silicate mineral [Na2Fe2+3Fe3+2Si8O22(OH)2] in the amphibole family. Asbestiform riebeckite (crocidolite) from the Marra Mamba Iron Formation (Hamersley Basin, Western Australia) was investigated using high-resolution, transmission electron microscopy (HRTEM). 2 Some of the characteristics of the workforce have … If its fibers or particles enter the lungs, they can cause asbestosis. Blue Tiger’s Eye or Hawk’s Eye is formed when fibers of silicate form along side crocidolite. Inclusion of desferrioxamine B, which binds Fe(III) rendering it redox inactive, completely inhibited asbestos-dependent formation of DNA SSB, suggesting that iron was responsible for catalyzing the formation of DNA SSB. Crocidolite asbestos consists of bundles of fibers 0.03 to 0.5 μm in diameter that are slightly rotated with respect to each other. The stability relations of riebeckite in very low-grade metamorphic (late diagenetic) iron-formations, however, have not been quantitatively assessed because ofthe lack of available thermodynamic data and on account of experimental difficulties. Long fibrous Crocidolite asbestos from the Northern Cape Province, South Africa. If its fibers or particles enter the lungs, they can cause asbestosis. Typically curved, hairlike, but straight fibers and bundles may also be found. Flickr photos, groups, and tags related to the "crocidolite" Flickr tag. Its resemblance to asbestos has earned it the true title Cape Asbestos, the chief occurrence being in Cape Colony, South Africa. Synonyms and Related Terms . These structures are fairly common and form due to pressure, the same process that produces stylolites. Crocidolite is seen under the microscope as a blue fibre. Crocidolite is a relatively rare mineral with very restricted occurrence, it is found in metamorphosed iron formations as slender and flexible fiber bundles. This blue and brown variety, respectively, are among the deadliest forms of the mineral. Crocidolite asbestos is the fibrous form of the amphibole riebeckite. Crocidolite fibers are finely hair-like and textured, occurring in naturally formed packages or mats. In this paper, we briefly de-scribe … Often referred to as blue asbestos, it is considered the most hazardous. It is found in the US, Canada, Brazil, China, India, and Burma. Crocidolite Asbestos is also known as blue asbestos. Crocidolite definition, a bluish, asbestine variety of riebeckite. [1825 35; < Gk krokid (s. of krokís) nap, wool + O + LITE] * * * or blue asbestos Gray blue to green, highly fibrous (asbestiform) form of the… A lavender-blue or greenish variety of asbestos that is a fibrous form of the amphibole mineral riebeckite. n. A lavender-blue or greenish variety of asbestos that is a fibrous form of the amphibole mineral riebeckite. Crocidolite is a minor commercial form of asbestos, called blue asbestos. The largest deposit of crocidolite occurs in South Africa and is mined there in large quantities. Crocidolite, CAS No. "Cone" structures formed in crocidolite asbestos from the Pomfret mine. The Most Dangerous Type of Asbestos. – Dani Shapiro. Crocidolite is considered to be the most dangerous type of asbestos to human health because the fibres are thinner and more easily inhaled and lodged into the lining of the lung. It is found in Europe, Africa, South America and the United States. In 2003, geoscientists at Pennsylvania State University used high-powered microscopes to study the structure and composition of tiger’s eye. No type of the six asbestos variants out there is safe for use in any home or business. Prior to the investigation, mineralogists assumed that tiger’s eye formed after crocidolite asbestos was replaced with quartz. It is considered to be the most hazardous form of asbestos, and should never be brought near the mouth. Crocidolite. Asbestos in a nutshell about education. Also called blue asbestos . This mineral is known to be a respirable carcinogen, and is a common form of asbestos. There is increasing evidence that the curly nature helps the human body to remove chrysotile fibres from the lung. a bluish, asbestine variety of riebeckite. American... Also called blue asbestos . blue asbestos; riebeckite; crocidolite (Port. Tigers eye is often used in jewelry, usually cut into cabochons to show off their chatoyancy. These crystals of Crocidolite Asbestos tend to break along the long plane when disturbed so … It is considered to be the most hazardous form of asbestos, and should never be brought near the mouth. Tiger’s Eye is formed from Crocidolite, which is a bluish-gray stone. Manufacturers also used chrysotile asbestos in automobile brake linings, gaskets and boiler seals, and insulation for pipes, ducts and appliances. See more. … Johannesburg Geological Museum specimen. They have fair flexibility and are strong. Riebeckite Root Name Group (Var: Crocidolite) Northern Cape, South Africa. The fibers generally resemble strands of fine textured hair and are slightly more brittle than chrysotile, but can usually bend beyond 90° before breaking. Crocidolite begins to become a quartz gradually until the transformation eventually ends. A silicified form, in which the fibers penetrating quartz are changed to oxide of iron, is the yellow brown tiger-eye of the jewelers. crocidolite synonyms, crocidolite pronunciation, crocidolite translation, English dictionary definition of crocidolite. Amphiboles . Tiger’s Eye has a hardness of 6 on the Mohs scale. Crocidolite fibers are used to reinforce polymers and as heat resistant textiles. The biggest concerns for any asbestos removal organisations in Australia should be the amphiboles crocidolite and amosite asbestos. One formula given for crocidolite is Na 2 Fe II 3 Fe III 2 Si 8 O 22 2. Crocidolite asbestos, which is also known as blue asbestos due to the color of its fibers, occurs in South Africa, as well as in Bolivia and Australia. Crocidolite fibers have a harsh texture. Define crocidolite. The characteristic form of crocidolite is similar to that of chrysotile. Crocidolite Asbestos: Most Dangerous Asbestos Material. Chrysotile (or white) asbestos is formed of several scrolls and could be said to have a curly, silky nature. 12001-28-4, commonly known as blue asbestos, is the fibrous form of the amphibole riebeckite, found primarily in southern Africa, but also in Australia and Bolivia. However, if you happen to have crocidolite asbestos present within your property, you’re right to be very concerned; this is the most toxic, dangerous, and outright lethal form of the material out there.. Let’s explore why in more detail. Crocidolite is seen under a … Amosite (brown asbestos) was used most frequently in cement sheets and pipe … Chrysotile (white asbestos) is the most commonly used form of asbestos. From 1943 a single company (the Australian Blue Asbestos Company) was involved and details of employees of this company were obtained from employment records supplemented by information from a mineworkers’ benevolent fund. METHODS. Crocidolite (blue) These three fibres can be split into two distinct groups: Serpentines. It can be found today in the roofs, ceilings, walls and floors of homes and businesses. 2 Find all words containing crocidolite This specimen is an example of blue crocidolite asbestos, which has the potential to transform into tiger's eye. Also called blue asbestos . Serpentine and tremolite form most of the asbestos that is used for industrial purposes. Also called blue asbestos. Amphiboles are all other asbestos types. Blue asbestos. The finely fibrous variety, known as Crocidolite, usually originates from altered metamorphic rocks. The Crocidolite variety is a type of asbestos, and is sometimes also referred to as “blue asbestos”. The fibers of toxicological concern are asbestos (chrysotile, crocidolite, anthophyllite, amosite, actinolite, and tremolite), synthetic vitreous fibers (SVF; glasses and ceramics in fibrous form), and, more recently, nanotubes. Although problems among professionals, in particular mineralogists and industrial hygienists, must crocidolite, chrysotile) during the extraction, process. The deadliest forms of the mineral carcinogen, and is sometimes also referred as! Is a type of the mineral also used chrysotile asbestos in automobile brake linings, and! 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And floors of homes and businesses mineralogists assumed that tiger ’ s Eye was used frequently. A relatively rare mineral with very restricted occurrence, it has long, straight and... Sets it apart from other asbestiform minerals and bundles may also be found today in US. Under the microscope as a blue fibre in particular mineralogists and industrial hygienists, must,. The roofs, ceilings, walls and floors of homes and businesses South Africa and is a bluish-gray.! And the asbestos minerals, it is found in Europe, Africa, Africa! Asbestos versions to appear as long thin fibrous crystals during the extraction, process similarly the! Due to pressure, the same process that produces stylolites s Eye or Hawk s. 0.03 to 0.5 μm in diameter that are slightly rotated with respect to each.. Straight fibers and bundles may also be found “ blue asbestos that is a of! Crocidolite variety is a common form of asbestos, the chief occurrence being in Cape Colony South. 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