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 ?
Note on tremolite zone from the extension of Shkakote-Qila Ultramafic complex in Utmankhel, Mohmand Agency.
Sean Fitzgerald of Scientific Analytical Institute, the scientist who conducted the tests, said he was shocked that he found tremolite asbestos in every single product.
Asbestos (chrysotile, amosite, crocidolite, tremolite, actinolite and anthophyllite).
Most of the metacarbonate rocks are monomineralic (calcite or dolomite) but locally contain talc, muscovite, phlogopite, garnet, and minor tremolite. In the higher metamorphic grade calc-silicate rocks diopside and forsterite are present (Armitage 1989).
Through X-ray diffraction analysis, the mineralogical composition and content of Three Gorges granite are approximately 20 percent biotite, 25 percent quartz, 45 percent feldspar, 5 percent tremolite, and 5 percent others.
Department of Energy and the Tremolite Asbestos Registry in Libby, Montana.
Compared to amphiboles in the tremolite-actinolite-ferroactinolite series (Deer et al., 1997), the overall pale colour, relatively low SG and weak pleochroism corresponded to a member with a low iron content, and therefore suggested tremolite, rather than actinolite, as the identity of this crystal.
Other potential environmental exposures are also undergoing investigations to assess exposures and potential health risks: These include naturally occurring asbestos and other EMP deposits in the United States such as tremolite in El Dorado Hills, California (ATSDR 2015; U.S.
Castellanos and co-workers (personal communication) described in detail the characteristic mineral assemblages from reaction zones recognized in marbles, which include calcite + graphite [+ or -] quartz; calcite + diopside [+ or -] tremolite [+ or -] epidote-group minerals [+ or -] muscovite; calcite + wollastonite + quartz + garnet + diopside; calcite + dolomite + Ti-clinohumite + diopside + forsterite + clinochlore [+ or -] graphite; calcite + forsterite + tremolite; dolomite + calcite + clinochlore.
[21] Exposure to tremolite asbestos or fibrous zeolite (erionite) in Southeast Turkey is well-documented.
These rocks in petrology studies have nemato-plastic texture and have been transformed into Tremolite, Actinolite and Albite schist.
Magnetite, actinolite, tremolite, tourmaline, titanite, and quartz are the major minerals; pyrite and chalcopyrite occur as minor phases in the accompanying layered ore bodies (Figure 6(c)).