Common Mineral Associations: Smaragdite is an emerald green variety of Actinolite. They combine together and form a series of magnesium iron silicate minerals. The name actinolite was retained for petrological reasons in the nomenclature (Leake et al., 1997; Hawthorne et al. The name actinolite is derived from the Greek word aktis, meaning âbeamâ or ârayâ, because of the mineralâs fibrous nature. H 2 O. The mineral is named for Cymru, which is the Welsh word for Wales. Ferro-actinolite is the ferrous iron-rich endmember of the actinolite-tremolite continuous solid solution series of the double chain calcareous amphibole group of inosilicate minerals. Note: Tremolite is defined as having an Mg/(Mg+Fe 2+) ratio ⥠0.9; actinolite has a ratio of 0.5â0.9 and ferro-actinolite has a ratio of less than 0.5. /ak tin l uyt , ak teuh nl /, n. Mineral. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. 220 Table 1.1 Common names, CAS numbers, synonyms, non-asbestos mineral analogues, idealized chemical formulae, selected physical and chemical properties of asbestos minerals Common Name CAS No. A calcium magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where iron substitutes in increasing amounts for magnesium. Actinolite - Ca 2 (Mg,Fe 2+) 5 [Si 8 O 22](OH,F) 2 Named in 1794 by Richard Kirwan from the Greek "aktina" for "ray" and "lithos" for "stone" in allusion to the fibrous nature of the original specimens. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. Actinolite-Tremolite Series. 1. Actinolite. (This word is also the origin of the name of the chemical element actinium.) Actinolite definition, a variety of amphibole, occurring in greenish bladed crystals or in masses. Actinolite is named after Greek word "aktis" - a ray, alluding to its common occurence as radiating needles. Chrysolite is by far the most common, comprising perhaps ninety five percent of the asbestos products found in buildings in the United States today. The name actinolite is derived from the Greek word aktis (á¼ÎºÏίÏ), meaning "beam" or "ray", because of the mineral's fibrous nature. 77536-66-4 - Asbestos, actinolite - Searchable synonyms, formulas, resource links, and other chemical information. Most people chose this as the best definition of actinolite: A greenish variety of amp... See the dictionary meaning, pronunciation, and sentence examples. Actinolite is a mineral that is part of a so-called solid-solution series, which means that you get different but related minerals depending on the amounts of (in this case) iron and magnesium that are present.The magnesium-rich end member is tremolite; the iron-rich end member is ferro-actinolite; and what lies between is actinolite.. The present work reports chemical and structural data of actinolite asbestos from Aurina Valley, Bolzano (Italy). As such, most persons working with the material will never notice that they are inhaling the particles. Actinolite has a greater presence of iron over magnesium, whereas Tremolite has a greater presence of magnesium over iron. Like tremolite, asbestiform actinolite is regulated as asbestos. Like all form of asbestos, Actinolite asbestos can exist in tiny particles indiscernible to the human eye. The compositional range from about 0.9 Mg 7 Si 8 O 22 (OH) 2 to about Fe 2 Mg 5 Si 8 O 22 (OH) 2 is represented by the orthorhombic amphibole known as anthophyllite . Asbestos is a generic name that refers to a group of six naturally occurring fibrous silicate minerals (actinolite, amosite, anthophylite, chrysotile, crocidolite, and tremolite).Asbestos minerals are characterized by fibers or bundles of fine single crystal fibrils. Faster access than browser! All the series members belong to the monoclinic crystal system.. a variety of amphibole, occurring in greenish bladed crystals or in masses. Chemical Formula: {Ca 2}{(Mg,Fe 2+) 5}(Si 8 O 22)(OH) 2 Locality: Common world wide. Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks. See more. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. Amphiboles break apart into small, straight, needle-like fibers that are easily airborne and pose a greater risk of inhalation and disease than the serpentine asbestos chrysotile. Actinolite is an amphibole silicate mineral with the chemical formula. It also occurs as a product of metamorphism of magnesium-rich limestones . (This word is also the origin of the name of the chemical element actinium.) Tremolite is a relatively common mineral in some metamorphic rocks. Actinolite is an intermediate member in a solid-solution series between tremolite (Mg-rich) and ferro-actinolite (Fe-rich) amphiboles. Name Origin: From the Greek, aktinos, meaning ârayâ in allusion to actinoliteâs fibrous nature. Mineral Data, Mineralienatlas Lexikon, Actinolite. The name actinolite is derived from the Greek word aktis (á¼ÎºÏίÏ), meaning "beam" or "ray", because of the mineral's fibrous nature. The name actinolite is derived from the Greek word aktis (á¼ÎºÏίÏ), meaning "beam" or "ray", because of the mineral's fibrous nature. Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. It occurs from the conversion of dolomite, silica and water into tremolite, calcite and carbon dioxide by way of the following formula: . 2012), since it is entrenched in the literature. The name actinolite is derived from the Greek word aktis (á¼ÎºÏίÏ), meaning "beam" or "ray", because of the mineral's fibrous nature. Mineralogy. [1825 35; ACTINO + LITE] * * * Colourless to green amphibole mineral, darkening… The following formula comparison indicates the position of individual well-known members within the series: As seen from the chemical formula above, Mg and Fe ions can be freely exchanged in the crystal structure. The iron content in the Actinolite mineral is more than that of magnesium whereas in Tremolite, the magnesium is more than iron. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. There are six forms of mineral deposits that are referred to as asbestos: chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite. The chemical formula of Actinolite asbestos is: Ca2 (Mg,Fe) 5Si 8 O22 (OH)2 . Actinolite is the intermediate member of the tremolite-ferro-actinolite series. + 2 definiÈii traduceri actinolite Chemical formula is Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. actinolite (countable and uncountable, plural actinolites) ( mineralogy ) A mineral with monoclinic crystals of the chemical formula Ca 2 ( Mg , Fe ) 5 Si 8 O 22 (O H ) 2 , belonging to the amphibole group. (en) Das Mineral Aktinolith (Strahlstein) ist ein sehr häufig vorkommendes und bekanntes, gesteinsbildendes Kettensilikat aus der Gruppe der Calcium-Amphibole. Actinolite is an amphibole silicate mineral with the chemical formula Ca(Mg,Fe)SiO(OH). Actinolite is an amphibole mineral.Tremolite and Actinolite are identical minerals; their chemical formulae are alike, with a combination of iron and magnesium. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. [2] ( This word is also the origin of the name of the chemical element actinium.). How does Actinolite asbestos affect the body? Actinolite is an amphibole silicate mineral with the chemical formula. In this series, Actinolite acts as the intermediate member. Chatoyant, translucent to opaque, green to yellowish green colour stones are cut into cabochons and called Actinolite cat's eye. Xuannga Mahini, in Encyclopedia of Toxicology (Second Edition), 2005. The old mineral name uralite is at times applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite. 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