Libby amphibole tremolite

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August undefined, 2024

WebPreparation and Characterization of “Libby Amphibole” Toxicological Testing Material ... asbestiform tremolite, and asbestiform actinolite. The amphiboles from the Vermiculite … WebThe commonest form is hornblende; other species include anthophyllite, cummingtonite, tremolite, actinolite, riebeckite, and glaucophane. A variety of jade, called nephrite, consists of actinolite in a finely fibrous form. ... subjects exposed to the Libby, MT, amphibole were shown to have elevated frequency and titers of ANA compared to a ...

Mortality in a cohort of vermiculite miners exposed to fibrous ...

WebAlthough many studies showed adverse effects following exposure to Libby amphibole (LA; a mixture of winchite, richterite, and tremolite), little is known regarding the relative … WebBackground: Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos … held his tongue

Tremolite - an overview ScienceDirect Topics

Web04. apr 2024. · Background on/Uses of Asbestos for Part 2 of the Risk Evaluation. For Part 2 of the Risk Evaluation for Asbestos, EPA will consider chrysotile (serpentine), crocidolite (riebeckite), amosite (cummingtonite-grunerite), anthophyllite, tremolite, actinolite, and Libby Amphibole Asbestos (and its tremolite, winchite and richterite constituents). Web25. mar 2024. · The mineral was usually mined in Libby Montana, which was contaminated with the regulated asbestos mineral Tremolite, and the unregulated Libby amphibole minerals. One common commercialized product of vermiculite is known as Zonalite. According to the EPA, between 1919 to 1990 over 70% of the Vermiculite sold in the … Web27. dec 2024. · Tremolite was the only regulated asbestos fiber found in the raw vermiculite ore, 2 but in 2003, Meeker et al. determined that the Libby amphibole (LA) was composed of toxic nonregulated amphibole fibers, including winchite (84%), and richterite (11%), in addition to tremolite (6%). 3 Several occupations in the Libby area have been … held his peace

Morphological and Optical Characterization of Amphiboles from Libby …

Libby Amphibole 2007 09075 - National Toxicology Program

WebAmphibole asbestos, which includes the minerals amosite, crocidolite, tremolite, anthophyllite, and actinolite, form crystalline fibers that are substantially more brittle than serpentine asbestos and is more limited in being fabricated. This group can form a variety of polymeric structures ... Libby Montana (Wylie and Verkouteren 2000). Table ... WebEnter the email address you signed up with and we'll email you a reset link. held hold meaningWebThe presence of the blue sodium-rich amphibole glaucophane defines rocks of ... Though these amphiboles have historically been referred to as tremolite (or soda ... 2003; Meeker, 2003). Microprobe characterization of the material from Libby, MT, indicates the mineral has an average percent composition of 56.8 SiO 2, 1.9 FeO, 4.5 Fe 2 O 3 ... held hostage for money

"WebPowder and Valiant Shower to Shower Talc Products for Amphibole (Tremolite) Asbestos Expert Report. Several aspects are of note. First, the frequencies are low but uniform over a wide range of widths. ... Like Italian fluoro-edenite and Libby winchite-richterite asbestos, the first mode is at 0.33 and the second is at about 0.6 μm. " - Libby amphibole tremolite

Libby amphibole tremolite

Iron topochemistry and surface reactivity of amphibole asbestos ...

WebA small cohort of 194 men with low exposure to fibrous tremolite (mean 0.75 f/ml y) in the mining and milling of vermiculite in South Carolina experienced 51 deaths 15 years or more from first employment. The SMR (all causes) was 1.17 reflecting excess deaths from circulatory disease. There were four deaths from lung cancer and 3.31 expected ... WebBackground: Fibrous tremolite is a widespread amphibole asbestiform mineral, airborne fibres of which constitute an environmental hazard in Libby, Montana, northern …

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Webal. 1997). Previously, the amphibole from Vermiculite Moun-tain had been called soda tremolite (Larsen 1942), richterite (Deer et al. 1963), soda-rich tremolite (Boettcher 1966b), and tremolite asbestos and richterite asbestos (Langer et al. 1991; * E-mail: [email protected] Nolan et al. 1991). Web17. mar 2024. · Between 1925 and 1990, vermiculite was mined near Libby, Montana. This mine accounted for more than 50% of vermiculite production worldwide. However, the mine was contaminated with tremolite asbestos and asbestos-like fibers. Concerns for workers and residents in Libby arose and the EPA became involved with cleanup in the area.

WebTremolite is a noncommercial form of amphibole mineral that is present in some chrysotile, talc, and vermiculite deposits. Inhalation of asbestiform tremolite is suspected to have caused or contributed to an increased incidence of mesothelioma in certain mining settings; however, very little is known about the magnitude of tremolite exposure that occurred at … WebTremolite Asbestos. Tremolite asbestos is known for its heat resistant properties and can also be woven into fabric. Like other asbestos in the amphibole family, tremolite has sharp fibers that can easily be inhaled or ingested. Tremolite is no longer mined and is responsible for many cases of asbestos-related cancer and asbestos diseases.

Web11. avg 2004. · The community of Libby, Montana has recently been the focus of national attention secondary to widespread amphibole contamination associated with vermiculite … WebIn particular, Libby Amphibole Asbestos (“LAA”) is known to be present with a silicate, mica‐like mineral called vermiculite, extracted from an open pit mine near Libby, Montana, until its closure in 1990.21Thus, EPA is proposing to add LAA (and its tremolite, winchite, and richterite constituents) as well as vermiculite to the scope of ...

WebHowever, the vermiculite ore taken from a mining operation in Libby, Montana, was contaminated with asbestos amphibole minerals, including tremolite and actinolite. ...

Web01. apr 2007. · BackgroundVermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of homes in the United States, Canada, and other countries.ObjectiveThis report … held hostage movie downloadWeb22. mar 2024. · Amphibole asbestos has needle-shaped fibers. Studies suggest it takes much less exposure to amphibole asbestos to cause cancer, compared to serpentine asbestos. Amosite and crocidolite are the most commercially valuable types of amphibole asbestos, while anthophyllite, tremolite and actinolite are considered noncommercial forms. held hostage for money crosswordWebLibby Amphibole asbestos is in the tremolite subgroup and historically has been reported as a sodium-rich tremolite (Larsen, 1942; Boettcher, 1966; Leake, 1978). However, a more exact analysis of Libby Amphibole asbestos, characterizing the cation composition of individual fibers to better define the amphiboles present, indicates winchite and ... held him backWeb15. sep 2011. · Over a 70-year period, a mine near Libby, MT supplied nearly 80% of the world’s vermiculite. Raw vermiculite, which was contaminated with naturally occurring amphibole in veins throughout the deposit, was shipped to processing sites throughout the United States for exfoliation. In this pilot study, tree bark samples were collected near … held hostage french dvdripWebTremolite is a member of the amphibole group of silicate minerals with composition: Ca 2 (Mg 5.0-4.5 Fe 2+ 0.0-0.5)Si 8 O 22 (OH) 2.Tremolite forms by metamorphism of sediments rich in dolomite and … held hostage online subtitratWeb01. maj 2010. · The finding of an association between CFE and cardiovascular mortality suggests persons exposed to Libby amphibole should be monitored for this outcome, and a clear exposure-response relationship between C FE and mortality from asbestos-related causes is demonstrated. Objective: To examine the relationship between cumulative … held high meaningWebal. 1997). Previously, the amphibole from Vermiculite Moun-tain had been called soda tremolite (Larsen 1942), richterite (Deer et al. 1963), soda-rich tremolite (Boettcher … held hybrid