Tremolite

Tremolite

Tremolite is a member of the amphibole group of silicate minerals with composition: Ca2Mg5Si8O22(OH)2. Tremolite forms by metamorphism of sediments rich in dolomite and quartz. Tremolite forms a series with actinolite and ferro-actinolite. Pure magnesium tremolite is creamy white, but the color grades to dark green with increasing iron content. It has a hardness on Mohs' scale of 5 to 6.

A fibrous variety of tremolite is used as asbestos. This material is toxic and inhaling the fibers can lead to asbestosis, lung cancer and mesothelioma. One of the two minerals of the gemstone jade is nephrite, a green variety of tremolite.

Tremolite is an indicator of metamorphic grade since at high temperatures it converts to diopside. Calcite, grossular, talc, and serpentine are common associates of tremolite.

References

* [http://webmineral.com/data/Tremolite.shtml Webmineral]
* [http://www.mindat.org/min-4011.html Mindat]
* [http://mineral.galleries.com/minerals/silicate/tremolit/tremolit.htm Mineral galleries]
* [http://space.newscientist.com/article.ns?id=dn12769&feedId=online-news_rss20 Mineral may unlock secrets of Venus's ancient oceans] , New Scientist, "10 October 2007"

ee also

*Libby, Montana


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  • tremolite — [trem′ə līt΄] n. [after the Tremola valley, in Switzerland, where it was found + ITE1] a hard, white to dark gray, monoclinic amphibole, Ca2Mg5Si8O22 (OH) 2, that is closely related to actinolite and found in either fibrous or crystalline form;… …   English World dictionary

  • tremolite — Amphibole Am phi*bole ([a^]m f[i^]*b[=o]l), n. [Gr. amfi bolos doubtful, equivocal, fr. amfiba llein to throw round, to doubt: cf. F. amphibole. Ha[ u]y so named the genus from the great variety of color and composition assumed by the mineral.]… …   The Collaborative International Dictionary of English

  • tremolite — noun Etymology: French trémolite, from Tremola, valley in Switzerland Date: 1799 a white or gray mineral of the amphibole group that is a silicate of calcium and magnesium • tremolitic adjective …   New Collegiate Dictionary

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  • tremolite-asbestos — tremolito asbestas statusas T sritis chemija apibrėžtis Pluoštinė tremolito atmaina. atitikmenys: angl. tremolite asbestos rus. тремолит асбест …   Chemijos terminų aiškinamasis žodynas

  • tremolite — tremolitic /trem euh lit ik/, adj. /trem euh luyt /, n. Mineral. a white or grayish variety of amphibole, Ca2Mg5Si8O22(OH)2, usually occurring in bladed crystals. [1790 1800; named after Tremola, valley in Switzerland; see ITE1] * * * …   Universalium

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