amphibole

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amphibole

(ăm`fəbōl'), any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements. The amphibole minerals are closely related in crystal structure, but they crystallize in two different systems, orthorhombic and monoclinic; their close structural relationship is reflected in uniform prism angles of about 56° and 124° and in good cleavages parallel to these prisms. They are commonly green to black, but may be colorless, white, yellow, blue, or brown. The amphibole minerals are found both in igneous and metamorphic rocks. The 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.

amphibole

[′am·fə‚bōl]
(mineralogy)
Any of a group of rock-forming, ferromagnesian silicate minerals commonly found in igneous and metamorphic rocks; includes hornblende, anthophyllite, tremolite, and actinolite (asbestos minerals).
References in periodicals archive ?
Since the majority of the homes had VAI insulation containing amphibole asbestos, it is very likely that the insulation was derived from the Libby, Montana, Zonolite Mine.
suggesting that chrysotile asbestos associated with residential commercial products may pose a greater potential exposure risk to home occupants than amphibole asbestos from VAI.
This fiber is not a form of asbestos but is comparable in size to amphibole asbestos and is also biopersistent.
Subjects with asbestosis have higher amphibole asbestos fiber counts than those with pleural plaques or mesothelioma.
Autoantibodies from mice exposed lo Libby amphibole asbestos bind SSA/ Ro52-enriched apoptotic blebs of murine macrophages.
2])] and two types of amphibole asbestos, International Union Against Cancer (UICC) crocidolite and Libby amphibole.
The Chrysotile Institute, a nonprofit organization funded by the Canadian government, maintains that chrysotile is not as toxic as amphibole asbestos.
The vermiculite, mined extensively from the 1920s to 1990, was laced with toxic amphibole asbestos, and the mining operations released asbestos into the air and contaminated the mine, processing sites, and many of the buildings and properties in town.
A vermiculite mine that operated in Libby from 1921 to 1990 exposed workers, their families, and the local environment to dangerous levels of toxic amphibole asbestos.
But the construction that is transforming this once rural area has also dug up a health risk--thin needles of amphibole asbestos, a particularly hazardous form of the mineral.
This finding is extremely important for guiding future public health assessments of exposure to vermiculite from the Libby mine and exposure to amphibole asbestos in general.
Exposure to amphibole asbestos is associated with the development of mesotheliomas, lung cancers, and fibrotic lung diseases (1,2).