Faster access than browser! 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. Actinolite-Tremolite Series. The present work reports chemical and structural data of actinolite asbestos from Aurina Valley, Bolzano (Italy). Actinolite is an amphibole mineral.Tremolite and Actinolite are identical minerals; their chemical formulae are alike, with a combination of iron and magnesium. A calcium magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where iron substitutes in increasing amounts for magnesium. In this series, Actinolite acts as the intermediate member. The old mineral name uralite is at times applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite. Actinolite is an intermediate member in a solid-solution series between tremolite (Mg-rich) and ferro-actinolite (Fe-rich) amphiboles. How does Actinolite asbestos affect the body? Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. 1. Tremolite is a relatively common mineral in some metamorphic rocks. It is an amphibole silicate mineral, which belongs to the series of minerals known as Ferro-actinolite and tremolite. /ak tin l uyt , ak teuh nl /, n. Mineral. Actinolite has a greater presence of iron over magnesium, whereas Tremolite has a greater presence of magnesium over iron. Synonyms Non-Asbestos Mineral Analogue Idealized Chemical Formula Colour Decom-position Tempe-rature (°C) Other Properties Asbestos 1332-21-4* The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. 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. The mineral is named for Cymru, which is the Welsh word for Wales. See more. It occurs from the conversion of dolomite, silica and water into tremolite, calcite and carbon dioxide by way of the following formula: . 92 relations. The iron content in the Actinolite mineral is more than that of magnesium whereas in Tremolite, the magnesium is more than iron. Actinolite is named after Greek word "aktis" - a ray, alluding to its common occurence as radiating needles. The middle member of this series with an intermediate composition is called actinolite (the silky fibrous mineral form is one form of asbestos). Mineral Data, Mineralienatlas Lexikon, Actinolite. Mineralogy The chemical formula of Actinolite asbestos is: Ca2 (Mg,Fe) 5Si 8 O22 (OH)2 . The molecular formula identifies each type of element by its chemical symbol and identifies the number of atoms of each element found in one discrete molecule of the substance. The name actinolite was retained for petrological reasons in the nomenclature (Leake et al., 1997; Hawthorne et al. Actinolite is an amphibole silicate mineral with the chemical formula ☐Ca 2 (Mg 4.5-2.5 Fe 2+ 0.5-2.5)Si 8 O 22 (OH) 2. Etymology. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. 5CaMg(CO3)2 + 8SiO2 + H2O -----> Ca2Mg5Si8O22(OH)2 + 3CaCO3 + 7CO2. Tremolite and Actinolite are two very similar minerals that form a series with each other and essentially share the same chemical formula. Actinolite is an amphibole silicate mineral with the chemical formula Ca(Mg,Fe)SiO(OH). — Actinolite and Tremolite are two very similar minerals that form a series with each other and essentially share the same chemical formula. Like tremolite, asbestiform actinolite is regulated as asbestos. There are six forms of mineral deposits that are referred to as asbestos: chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite. Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks. 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.. Actinolite definition, a variety of amphibole, occurring in greenish bladed crystals or in masses. The name actinolite is derived from the Greek word aktis, meaning “beam” or “ray”, because of the mineral’s fibrous nature. All the series members belong to the monoclinic crystal system.. 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. Actinolite is an amphibole silicate mineral with the chemical formula. Actinolite is an amphibole silicate mineral with the chemical formula. 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]. 2012), since it is entrenched in the literature. Chrysolite is by far the most common, comprising perhaps ninety five percent of the asbestos products found in buildings in the United States today. Download Unionpedia on your Android™ device! As seen from the chemical formula above, Mg and Fe ions can be freely exchanged in the crystal structure. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. Uses. Chemical Formula: {Ca 2}{(Mg,Fe 2+) 5}(Si 8 O 22)(OH) 2 Locality: Common world wide. a variety of amphibole, occurring in greenish bladed crystals or in masses. Jade-Wikipedia. Download. 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. The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. H 2 O. The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. Actinolite. Most people chose this as the best definition of actinolite: A greenish variety of amp... See the dictionary meaning, pronunciation, and sentence examples. Mineralogy. They combine together and form a series of magnesium iron silicate minerals. [1825 35; ACTINO + LITE] * * * Colourless to green amphibole mineral, darkening… Chatoyant, translucent to opaque, green to yellowish green colour stones are cut into cabochons and called Actinolite cat's eye. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2. Chemical formula is Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. 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. 2. Actinolite (CAS # 12172-67-7)⁶, an amphibole asbestos mineral with the chemical formula [Ca 2 (Mg,Fe 2+) 5 Si 8 O 22 (OH) 2] n can occur in both asbestiform (low diameter and high aspect ratio) and non-asbestiform (cleavage fragment) morphologies. Common Mineral Associations: Smaragdite is an emerald green variety of Actinolite. Actinolite is comparatively a common mineral found in of some of the metamorphic rocks. 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 . Communication . 77536-66-4 - Asbestos, actinolite - Searchable synonyms, formulas, resource links, and other chemical information. Name Origin: From the Greek, aktinos, meaning “ray” in allusion to actinolite’s fibrous nature. [2] ( This word is also the origin of the name of the chemical element actinium.). A mineral with monoclinic crystals of the chemical formula Ca 2/sub [sub]5 Si 8 O 22/sub [sub]2, belonging to the amphibole group. 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. 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 a member of the amphibole class of asbestos minerals. (This word is also the origin of the name of the chemical element actinium.) Like all form of asbestos, Actinolite asbestos can exist in tiny particles indiscernible to the human eye. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. Xuannga Mahini, in Encyclopedia of Toxicology (Second Edition), 2005. Ferro-actinolite: Evans B W, Yang H (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature in an alteration of hornblende American Mineralogist 83 458-475: 1998: 0: 293: 0002000: Ferro-actinolite (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 Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. The following formula comparison indicates the position of individual well-known members within the series: (This word is also the origin of the name of the chemical element actinium.) As such, most persons working with the material will never notice that they are inhaling the particles. actinolitic /ak tin l it ik, ak teuh nl /, adj. + 2 definiții traduceri actinolite It also occurs as a product of metamorphism of magnesium-rich limestones . The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature.
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