tremolite


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tremolite:

see amphiboleamphibole
, any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements.
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Tremolite

 

(named for the Tremola Valley in the southern Swiss Alps), a monoclinic amphibole, Ca2Mg5[Si4O11](OH,F)2. Admixtures of Na, Fe, Mn, and Cr are regularly distributed in the octahedral positions of the structure, and admixtures of Al and P are located in the tetrahedral positions. The F~ and OH” content is correlated with the temperature of formation; tremo-lite with increased concentrations of F serves as a geologic thermometer for the characteristics of high-temperature geologic processes.

Tremolite forms grayish white acicular crystals and radiating columnar aggregates. Compact cryptocrystalline tremolite deposits are called nephrite, and silky fibrous aggregates form mountain leather or mountain cork. The hardness of tremolite on Mohs’ scale is 6–6.5, and its density is about 3,000 kg/m3.

Tremolite is a typical metamorphic mineral, formed in the early stage of contact metamorphosis of dolomites and lime stones. It is also characteristic of a low degree of regional metamorphism; it occurs less frequently in alpine-type veins and pegmatites. Deposits of mountain leather are located in Italy (Lombardy) and on Corsica.

tremolite

[′trem·ə‚līt]
(mineralogy)
Ca2Mg5Si8O22(OH)2 Magnesium-rich monoclinic calcium amphibole that forms one end member of a group of solid-solution series with iron, sodium, and aluminum; occurs in long blade-shaped or short stout prismatic crystals and also in masses or compound aggregates.
References in periodicals archive ?
Raman analysis taken with 532 nm laser excitation revealed a spectrum that had closest matches to several reference spectra for tremolite in the RRUFF database (www.
EPA 2014c), was the site of a former mine that produced vermiculite contaminated with a mixture of asbestiform amphiboles, including winchite, richterite, and tremolite asbestos (Meeker et al.
Tremolite (1-5%) occurs as colorless crystals of moderate to high relief and first to second order interference colors, which are in contact with calcite (Figures 4c-d).
As early as 1956, the Montana State Board of Health realized the health risks associated with tremolite.
In the most serpentinized samples, olivine is totally replaced by serpentine and minor magnetite, orthopyroxenes are pseudomorphosed with "bastite", clinopyroxenes recrystallized in tremolite and spinels are opacified.
4) The principal varieties of asbestos are chrysotile, a serpentine mineral, and crocidolite, amosite, anthophyllite, tremolite, and actinolite, all of which are amphiboles.
Section 4 of the Asbestos Information Act of 1988 defines asbestos as chrysotile, amosite, or crocidolite, or in fibrous form, tremolite, anthophyllite, or actinolite.
Low-grade metamorphism of komatiites produced mineral assemblages dominated by serpentine-antigorite, chlorite, talc, tremolite, magnesite-dolomite and magnetite.
The six types of asbestos are chrysotile, crocidolite, amosite, anthophyllite, tremolite and actinolite, but only the first three have been mined on a large scale.
The community experienced nearly a fourfold increase in an asbestos-related cancer during the period that Libby was the world's largest supplier of vermiculite, which contains highly toxic tremolite asbestos.
Jon Morgan, the director of the county's environmental management department, thundered to a local television station that the tremolite announcement "may unnecessarily scare the living daylights out of every man, woman, and child in El Dorado County and could possibly devastate the county for years to come.
Asbestos is made up of 6 different fibrous minerals--amosite, chrysotile, crocidolite, actinolite, anthoplylite and fibrous varieties of tremolite.