We strive for accurate content and locality information. Tremolite 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 is a relatively common mineral in some metamorphic rocks. Tremolite is not the common form of asbestos found in most of the asbestos products that were so popular during the twentieth century. [5] It is otherwise found as a contaminant. Tremolite in Thin Section Chemical Formula: Ca2(Mg,Fe++)5Si8O22(OH)2 : Composition: Molecular Weight = 853.16 gm Sodium 0.59 % Na 0.80 % Na 2 O Calcium 8.60 % Ca 12.03 % CaO Magnesium 9.71 % Mg 16.11 % MgO Titanium 0.11 % Ti 0.19 % TiO 2 Manganese 0.13 % Mn 0.17 % MnO Aluminum 1.39 % Al 2.63 % Al 2 O 3 Note: Tremolite is defined as having an Mg/ (Mg+Fe 2+) ratio ≥ 0.9; Actinolite has a ratio of 0.5–0.9 and Ferro-Actinolite has a ratio of less than 0.5. © Copyright 1997 - 2020 Hershel Friedman and Minerals.net, all rights reserved. It occurs from the conversion of dolomite, silica and water into tremolite, calcite and carbon dioxide by way of the following formula: 5CaMg (CO 3) 2 + 8SiO 2 + H 2 O ------> Ca 2 Mg 5 Si 8 O 22 (OH) 2 + 3CaCO 3 + 7CO 2 Tremolite is an indicator of metamorphic grade since at high temperatures it converts to diopside. Mg and Fe ions can be freely exchanged in the crystal structure. Nephrite, one of the two minerals of the gemstone jade, is a green variety of tremolite. Tremolite - Ca2(Mg,Fe2+)5[Si8O22] (OH,F)2 Named in 1789 by Johann Georg Albrecht Höpfner for the Tremola Valley (Val Tremola), Central St Gotthard Massif, Tessin, Switzerland. Tremolite and Actinolite are two very similar minerals that form a series with each other and essentially share the same chemical formula.Tremolite has a greater presence of magnesium over iron, whereas Actinolite has a greater presence of iron over magnesium. (mineralogy) A pale grey/green amphibole mineral that is a mixed calcium and magnesium silicate, with the chemical formula Ca 2 Mg 5 Si 8 O 22 (OH) 2; sometimes used in place of asbestos. Asbestos minerals fall into two groups or classes, serpentine asbestos and … Tremolite forms by metamorphism of sediments rich in dolomite and quartz. If you are requesting a locality be added, please only include. Tremolite forms a series with actinolite and ferro-actinolite. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. Tremolite in Hand Sample. Amphibole, double chain inosilicate mineral, Mineral may unlock secrets of Venus's ancient oceans, https://en.wikipedia.org/w/index.php?title=Tremolite&oldid=912423149, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, White, gray, lavender to pink, light green, light yellow, Elongated prismatic, or flattened crystals; also as fibrous, granular or columnar aggregates, Simple or multiple, common parallel to {100}; rarely parallel to {001}, Perfect on {110} at 56° and 124°; partings on {010} and {100}, This page was last edited on 25 August 2019, at 13:42. Tremolite occurs as grey, green or lavender to pink stout elongated crystals, which form fibrous, granular or columnar aggregates. There are six forms of mineral deposits that are referred to as asbestos: chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite. Start studying Chemical formulas. Complete substitution extends from tremolite [Ca 2 Mg 5 Si 8 O 22 (OH) 2] to ferro-actinolite [Ca 2 Fe 5 Si 8 O 22 (OH) 2].Actinolite is the intermediate member of the tremolite-ferro-actinolite series. Actinolite and Tremolite are two very similar minerals that form a series with each other and essentially share the same chemical formula.Actinolite has a greater presence of iron over magnesium, whereas Tremolite has a greater presence of magnesium over iron. [2], Tremolite was first described in 1789 for an occurrence in Campolungo, Piumogna Valley, Leventina, Ticino (Tessin), Switzerland.[1]. Tremolite occurs as a result of contact metamorphism of calcium and magnesium rich siliceous sedimentary rocks and in greenschist facies metamorphic rocks derived from ultramafic or magnesium carbonate bearing rocks. Therefore, involvement of local iron overload is plausible in tremolite-induced carcinogenesis as well. Tremolite and Actinolite are two very similar minerals that form a series with each other and essentially share the same chemical formula.Tremolite has a greater presence of magnesium over iron, whereas Actinolite has a greater presence of iron over magnesium. Tremolite forms a series with actinolite and ferro-actinolite. They are known as fine needle-like inclusions in quartz or emerald. A calcium magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where iron substitutes in increasing amounts for magnesium. Tremolite Properties. Tremolite forms a series with actinolite and ferro-actinolite. Tremolite is a member of the amphibole group of silicate minerals with composition: Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. L. Rushton, in Reference Module in Biomedical Sciences, 2014. Describe how the tetrahedra are linked to form the chain. Tremolite and Actinolite share several recognized varieties.Mountain Leather Pure magnesium tremolite is creamy white, but the color grades to dark green with increasing iron content. We suspect that calcium within the chemical formula for tremolite ([Ca 2 Mg 5 Si 8 O 22 (OH) 2] n) might have blocked the access of NTA 28) to iron. One of the six recognized types of asbestos. Tremolite may weather to talc, and both tremolite and actinolite may alter to chlorite or Fibrous tremolite is sometimes found as a contaminant in vermiculite, chrysotile (itself a type of asbestos) and talc. Documentation of the TLVs and BEIs with Other World Wide Occupational Exposure Values. Deriving its name from a locality in the Swiss Alps, tremolite is a member of the amphibole group, a complex series of silicate minerals. Tremolite forms by metamorphism of sediments rich in dolomite and quartz. It has a hardness on Mohs scale of 5 to 6. It has a hardness on Mohs scale of 5 to 6. See more » Magnesium. Mineral Information. White, light to dark gray, black, light yellow, light to dark green, emerald green, pink to purple. Tourmaline is a complex boron silicate mineral with a generalized chemical composition of: XY 3 Z 6 (T 6 O 18)(BO 3) 3 V 3 W. Letters in the formula above represent positions in the atomic structure of tourmaline that can be occupied by ions listed below. Classification of Ferro-actinolite Hide 4. Locate the two linked chains of Si tetrahedra. Our Recommended Book Selection at Amazon.com, Financial Donations and Collection Acquisitions. Tremolite has a high magnesium and iron content that makes it far less flexible than other types of asbestos. Actinolite, an amphibole mineral in the tremolite-actinolite series of calcium, magnesium, and iron silicates. American Conference of Governmental Industrial Hygienists. The W position may contain (OH), F or Cl. Origin: Notably Merelani Hills, Tanzania Mineral Species: Tremolite Mineral Group: Silicates Chemical Formula: {Ca 2}{Mg 5}(Si 8 O 22)(OH) 2 Hardness: 5-6 Crystal System: Monoclinic Colour: Colourless, white, brown, grey, light yellow, violet, but rarely and desirably as pale to mid-green. Approximately 40,200 tons of tremolite asbestos is mined annually in India. : Like tremolite, asbestiform actinolite is regulated as asbestos. Find the "bridging oxygens" which connect the two chains. Complete substitution extends from tremolite [Ca 2 Mg 5 Si 8 O 22 (OH) 2] to ferro-actinolite [Ca 2 Fe 5 Si 8 O 22 (OH) 2]. Magnesium is a chemical element with symbol Mg and atomic number 12. The fibrous form of tremolite is one of the six recognised types of asbestos. Rarely colorless. Tremolite and Actinolite share several recognized varieties. Tremolite is named after its discovery locality, in Val Tremola, near St. Gotthard, Switzerland. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number] Tremolite ☐Ca 2 (Mg 5.0-4.5 Fe 2+ 0.0-0.5 )Si 8 O 22 (OH) 2 CHEMICAL AND PHYSICAL INFORMATION 4.1 CHEMICAL IDENTITY Asbestos is a generic term for a group of six naturally-occurring, fibrous silicate minerals that have been widely used in commercial products. Translations The minerals in this series are abundant in regionally metamorphosed rocks, such as schists. Tremolite is termed a double chain silicate because pairs of chains of silica tetrahedra linked together extend infinitely in one direction within the crystal. 0-4.5Fe2+0.0-0.5) Si8O22 (OH) 2. Nephrite, one of the two minerals of the gemstone jade, is a green variety of tremolite. Tremolite forms by metamorphism of Sediments that are rich in dolomite and quartz form the mineral Tremolite, which uses ferro-actinolite and actinolite in the process. Named in 1946 by Nils Sundius for its relationship to Actinolite. The compositional range … Tremolite is a member of the amphibole group of silicate minerals with composition: Ca2(Mg5.0-4.5Fe 0.0-0.5)Si8O22(OH)2. In amphibole: Chemical composition. Chemical formula is Ca2 (Mg5.0-4.5Fe2+0.0-0.5)Si8O22 (OH)2. Tremolite definition is - a white or gray mineral of the amphibole group that is a silicate of calcium and magnesium. There are two limitations in this study. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. However, tremolite can occur naturally in other products with commercial use such as vermiculite and the mineral talc. Tremolite Acicular tremolite in quartzite Scanning electron micrograph of tremolite. This material is toxic, and inhaling the fibers can lead to asbestosis, lung cancer and both pleural and peritoneal mesothelioma. It forms in thin, parallel fibers, sometimes producing a distinct cat's eye effect when cut in cabochons. Actinolite is an intermediate member in a solid-solution series between magnesium-rich tremolite, Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2, and iron-rich ferro-actinolite, ☐Ca2(Mg2.5-0.0Fe2+2.5-5.0)Si8O22(OH)2. Tremolite and actinolite are two very similar minerals that form a series with each … Kinds of asbestos: this article describes the principal types of asbestos and explains the differences among Amphibole, Chrysotile, Crocidolite, Amosite, Anthophyllite & Tremolite Asbestos. Typical Appearance: Prismatic bladed crystals, fibrous, granular or columnar aggregates. The Mineral Tremolite Tremolite, a silicate mineral member belongs to the group amphibole with a composition: ☐Ca2 (Mg5. 7th Ed. New!! Asbestos describes any mineral that is extremely, Europe contains some very good localities for Tremolite, specifically Campolungo in Ticino, Switzerland; Saint-Marcel, in the Val D'Aosta, Italy; Alvito, Beja District, Portugal; and Storakersvatn, Rana, Norway (where it occurs as a. Hammers, Chisels, Loupes, Cotton-filled boxes, etc. 14567-73-8 - Tremolite asbestos - Searchable synonyms, formulas, resource links, and other chemical information. Tremolite forms by metamorphism of sediments rich in dolomite and quartz. Tremolite is an amphibole that is found as a comtaminant in chrysotile and talc deposits. Pure magnesium tremolite is creamy white, but the color grades to dark green with increasing iron content. Associated minerals include calcite, dolomite, grossular, wollastonite, talc, diopside, forsterite, cummingtonite, riebeckite and winchite. tremolite (countable and uncountable, plural tremolites) A pale grey/green amphibole mineral, a type of asbestos, that is a mixed calcium and magnesium silicate, with the chemical formula Ca 2 Mg 5 Si 8 O 22 (OH) 2; sometimes used in place of common asbestos. This quality made it unusable for industrial manufacturing or processing by itself. Formula: ◻ {Ca2} {Mg5} (Si8O22) (OH)2 The tremolite-actinolite series are defined as calcium amphiboles with A (Na+K+ 2Ca)<0.5 apfu and with C (Al+Fe3++2Ti)<0.5 apfu. Tremolite is a silicate mineral and member of the amphibole group. Variety of tremolite is an indicator of metamorphic grade since at high temperatures it converts to diopside BEIs other..., terms, and inhaling the fibers can lead to asbestosis, lung cancer and pleural! 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Green variety of tremolite quartzite Scanning electron micrograph of tremolite asbestos is mined annually in India are requesting a be!