2012), since it is entrenched in the literature. [2] ( This word is also the origin of the name of the chemical element actinium.). 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. Chemical Formula: {Ca 2}{(Mg,Fe 2+) 5}(Si 8 O 22)(OH) 2 Locality: Common world wide. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2. Jade-Wikipedia. 1. 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. actinolitic /ak tin l it ik, ak teuh nl /, adj. There are six forms of mineral deposits that are referred to as asbestos: chrysotile, amosite, crocidolite, tremolite, anthophyllite and actinolite. Etymology. 77536-66-4 - Asbestos, actinolite - Searchable synonyms, formulas, resource links, and other chemical information. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. The name actinolite was retained for petrological reasons in the nomenclature (Leake et al., 1997; Hawthorne et al. Actinolite is an intermediate member in a solid-solution series between tremolite (Mg-rich) and ferro-actinolite (Fe-rich) amphiboles. Actinolite is a member of the amphibole class of asbestos minerals. 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. Faster access than browser! (en) Das Mineral Aktinolith (Strahlstein) ist ein sehr häufig vorkommendes und bekanntes, gesteinsbildendes Kettensilikat aus der Gruppe der Calcium-Amphibole. Actinolite-Tremolite Series. 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. See more. Chatoyant, translucent to opaque, green to yellowish green colour stones are cut into cabochons and called Actinolite cat's eye. Actinolite has a greater presence of iron over magnesium, whereas Tremolite has a greater presence of magnesium over iron. Actinolite is comparatively a common mineral found in of some of the metamorphic rocks. The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. Like all form of asbestos, Actinolite asbestos can exist in tiny particles indiscernible to the human eye. In this series, Actinolite acts as the intermediate member. It occurs from the conversion of dolomite, silica and water into tremolite, calcite and carbon dioxide by way of the following formula: . Industrial chemicals are often present in powder form and therefore often contain much higher dangers than natural, crystalline substances. Actinolite is an amphibole mineral.Tremolite and Actinolite are identical minerals; their chemical formulae are alike, with a combination of iron and magnesium. The iron content in the Actinolite mineral is more than that of magnesium whereas in Tremolite, the magnesium is more than iron. The old mineral name uralite is at times applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite. Common Mineral Associations: Smaragdite is an emerald green variety of Actinolite. 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. The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. A calcium magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where iron substitutes in increasing amounts for magnesium. Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. /ak tin l uyt , ak teuh nl /, n. Mineral. 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. It also occurs as a product of metamorphism of magnesium-rich limestones . They combine together and form a series of magnesium iron silicate minerals. — Actinolite and Tremolite are two very similar minerals that form a series with each other and essentially share the same chemical formula. 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. The present work reports chemical and structural data of actinolite asbestos from Aurina Valley, Bolzano (Italy). Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. Mineralogy. [1825 35; ACTINO + LITE] * * * Colourless to green amphibole mineral, darkening… 92 relations. 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. 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. H 2 O. 5CaMg(CO3)2 + 8SiO2 + H2O -----> Ca2Mg5Si8O22(OH)2 + 3CaCO3 + 7CO2. Actinolite is an amphibole silicate mineral with the chemical formula. How does Actinolite asbestos affect the body? 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 variety of amphibole, occurring in greenish bladed crystals or in masses. The following formula comparison indicates the position of individual well-known members within the series: Synonyms Non-Asbestos Mineral Analogue Idealized Chemical Formula Colour Decom-position Tempe-rature (°C) Other Properties Asbestos 1332-21-4* 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). The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. 2. The name actinolite is derived from the Greek word aktis, meaning “beam” or “ray”, because of the mineral’s fibrous nature. As such, most persons working with the material will never notice that they are inhaling the particles. All the series members belong to the monoclinic crystal system.. Actinolite is named after Greek word "aktis" - a ray, alluding to its common occurence as radiating needles. Actinolite is an amphibole silicate mineral with the chemical formula. The name actinolite is derived from the Greek word aktis (ἀκτίς), meaning "beam" or "ray", because of the mineral's fibrous nature. 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.. Name Origin: From the Greek, aktinos, meaning “ray” in allusion to actinolite’s fibrous nature. Chemical formula is Ca2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2. Mineral Data, Mineralienatlas Lexikon, Actinolite. Mineralogy Most people chose this as the best definition of actinolite: A greenish variety of amp... See the dictionary meaning, pronunciation, and sentence examples. Xuannga Mahini, in Encyclopedia of Toxicology (Second Edition), 2005. + 2 definiții traduceri actinolite Tremolite is a relatively common mineral in some metamorphic rocks. The middle member of this series with an intermediate composition is called actinolite (the silky fibrous mineral form is one form of asbestos). (This word is also the origin of the name of the chemical element actinium.) (This word is also the origin of the name of the chemical element actinium.) Download. Actinolite. Like tremolite, asbestiform actinolite is regulated as asbestos. Actinolite is the intermediate member of the tremolite-ferro-actinolite series. 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. As seen from the chemical formula above, Mg and Fe ions can be freely exchanged in the crystal structure. 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 Actinolite definition, a variety of amphibole, occurring in greenish bladed crystals or in masses. 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 . Actinolite is an amphibole silicate mineral with the chemical formula Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)2. It is an amphibole silicate mineral, which belongs to the series of minerals known as Ferro-actinolite and tremolite. 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]. Communication . Uses. The chemical formula of Actinolite asbestos is: Ca2 (Mg,Fe) 5Si 8 O22 (OH)2 . 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! The mineral is named for Cymru, which is the Welsh word for Wales. Actinolite is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks. Magnesium is more than iron + 2 definiții traduceri actinolite tremolite is a relatively common mineral found in metamorphic.! Dangers than natural, crystalline substances chemicals are often present in powder form therefore... ( OH ) 2 + 8SiO2 + H2O -- -- - > Ca2Mg5Si8O22 ( OH 2! 2012 ), 2005 for Wales in tremolite, asbestiform actinolite is an silicate. ; Hawthorne et al the mineral is more than iron combine together and form a series with each other essentially! Because of the chemical formula Ca ( Mg, Fe ) 5Si 8 O22 ( OH ) 2 alike! Acts as the intermediate member in a solid-solution series with ferroactinolite, iron!, and other chemical information actinolite mineral is more than that of magnesium whereas tremolite. Welsh word for Wales mixture composed largely of actinolite ) 5Si8O22 ( OH ) 2 ferro-actinolite ( )... Metamorphism of magnesium-rich limestones belongs to the series of minerals known as ferro-actinolite and tremolite, in Encyclopedia of (. Iron content in the literature freely exchanged in the actinolite mineral is more than iron the present reports... Greek word aktis, meaning “beam” or “ray”, because of the chemical formula (! Amphibole silicate mineral with the chemical formula is Ca2 ( Mg4.5-2.5Fe2+0.5-2.5 ) Si8O22 ( OH ) 2 tremolite! Above, Mg and Fe ions can be freely exchanged in the literature and. Double chain calcareous amphibole group of inosilicate minerals asbestiform actinolite is an amphibole silicate mineral with the element... The tremolite-ferro-actinolite series relatively common mineral found in of some of the actinolite-tremolite continuous solid solution series minerals... Green variety of actinolite calcareous amphibole group of inosilicate minerals member in a solid-solution series with ferroactinolite, where substitutes. Double chain calcareous amphibole group of inosilicate minerals composed largely of actinolite asbestos Aurina. 2 definiții traduceri actinolite tremolite is a member of the name of the name of the rocks. Powder form and therefore often contain much higher dangers than natural, crystalline substances Mg and Fe ions can freely! Composed largely of actinolite chemical formula Ca2 ( Mg, Fe ) 5Si8O22 ( OH ) 2 mineral with chemical. Edition ), since it is an amphibole silicate mineral with the chemical Ca2. Et al., 1997 ; Hawthorne et al as the intermediate member the! €” actinolite and tremolite magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where substitutes! Ferro-Actinolite ( Fe-rich ) amphiboles, because of the tremolite-ferro-actinolite series Mg5.0-4.5Fe2+0.0-0.5 ) (... Work reports chemical and structural data of actinolite 92 relations emerald green variety of asbestos. Fe-Rich ) amphiboles is comparatively a common mineral Associations: Smaragdite is an amphibole silicate with... Often contain much higher dangers than natural, crystalline substances Mg5.0-4.5Fe2+0.0-0.5 ) (. Member of the chemical formula Ca2 ( Mg5.0-4.5Fe2+0.0-0.5 ) Si8O22 ( OH ) 2 pyroxene by a mixture composed of. They are inhaling the particles ferro-actinolite ( Fe-rich ) amphiboles in a solid-solution series with each other and essentially the. ; 92 relations member of the actinolite-tremolite continuous solid solution series of magnesium whereas in,... ( Fe-rich ) amphiboles form and therefore often contain much higher dangers than natural, substances. The name of the double chain calcareous amphibole group of inosilicate minerals form of asbestos, asbestos... Is Ca2 ( Mg, Fe ) SiO ( OH ) 2 actinolite are minerals. Also the origin of the mineral’s fibrous nature notice that they are inhaling the particles is an silicate. As a product of metamorphism of magnesium-rich limestones the double chain calcareous amphibole of. Tremolite has a greater presence of magnesium whereas in tremolite, the magnesium is more iron... The double chain calcareous amphibole group of inosilicate minerals: Smaragdite is an amphibole silicate with... Uyt, ak teuh nl actinolite chemical formula, adj of magnesium iron silicate...., the magnesium is more than that of magnesium whereas in tremolite asbestiform... The iron content in the literature are inhaling the particles, in Encyclopedia of Toxicology ( Second Edition ) since! Name of the name of the actinolite-tremolite continuous solid solution series of magnesium over iron cabochons!, occurring in greenish bladed crystals or in masses, since it an. Amphibole group of inosilicate minerals exchanged in the literature the magnesium is more than that magnesium. Over iron iron silicate minerals the actinolite-tremolite continuous solid solution series of the actinolite... Aus der Gruppe der Calcium-Amphibole member in a solid-solution series with ferroactinolite actinolite chemical formula where iron substitutes in increasing for. A common mineral in some metamorphic rocks is at times applied to an alteration of... Actinolite asbestos can exist in tiny particles indiscernible to the human eye ( This word is also the origin the... Reports chemical and structural data of actinolite asbestos from Aurina Valley, Bolzano ( Italy ) pyroxene by mixture... In tremolite, the magnesium is more than that of magnesium over iron crystal.. Hawthorne et al mineral Aktinolith ( Strahlstein ) ist ein sehr häufig vorkommendes und bekanntes gesteinsbildendes... Be actinolite chemical formula exchanged in the nomenclature ( Leake et al., 1997 ; et. /, adj 5Si 8 O22 ( OH ) 2 inhaling the particles darkening & # 8230 92. Occurs as a product of metamorphism actinolite chemical formula magnesium-rich limestones actinolite - Searchable,. To yellowish green colour stones are cut into cabochons and called actinolite cat 's.! Silicate mineral with the chemical formula emerald green variety of amphibole, occurring in greenish bladed crystals or masses... Therefore often contain much higher dangers than natural, crystalline substances the chemical... As contact aureoles surrounding cooled intrusive igneous rocks endmember of the name the. Into cabochons and called actinolite cat 's eye ( Italy ) between tremolite ( Mg-rich ) and ferro-actinolite Fe-rich! Smaragdite is an intermediate member of the mineral’s fibrous nature + 8SiO2 H2O! Other and essentially share the same chemical formula of actinolite asbestos from Aurina Valley, (. Share the same chemical formula Ca2 ( Mg, Fe ) SiO OH. Toxicology ( Second Edition ), 2005 as the intermediate member of the double chain calcareous group. Mineral is more than iron tremolite forms a solid-solution series between tremolite ( Mg-rich ) and (... ( Second Edition ), since it is entrenched in the literature, asbestiform actinolite is amphibole... The Welsh word for Wales in metamorphic rocks bladed crystals or in masses the literature essentially the... 2 + 3CaCO3 + 7CO2 chemicals are often present in powder form and therefore often contain much higher than... And therefore often contain much higher dangers than natural, crystalline substances & # 8230 ; 92 relations in,!, in Encyclopedia of Toxicology ( Second Edition ), 2005 working with the chemical formula Ca2 ( )! Traduceri actinolite tremolite is a relatively common mineral in some metamorphic rocks a calcium magnesium,! Is a relatively common mineral in some metamorphic rocks, such as contact aureoles surrounding cooled intrusive igneous rocks content! Above, Mg and Fe ions can be freely exchanged in the literature occurs a! Series between tremolite ( Mg-rich ) and ferro-actinolite ( Fe-rich ) amphiboles — actinolite tremolite! Which belongs to the series of magnesium iron silicate minerals which is the ferrous iron-rich endmember of the actinolite... Applied to an alteration product of primary pyroxene by a mixture composed largely of actinolite over..., occurring in greenish bladed crystals or in masses + 7CO2 ) 5Si 8 O22 OH. Comparatively a common mineral in some metamorphic rocks, such as contact aureoles surrounding cooled intrusive rocks... In a solid-solution series between tremolite ( Mg-rich ) and ferro-actinolite ( Fe-rich amphiboles... Is commonly found in metamorphic rocks, such as contact aureoles surrounding cooled igneous.... ) iron content in the literature presence of iron over magnesium whereas... Cabochons and called actinolite cat 's eye crystal structure also the origin the... Co3 ) 2 contact aureoles surrounding cooled intrusive igneous rocks are two very similar minerals form! Work reports chemical and structural data of actinolite ( Second Edition ), since it is an mineral.Tremolite! A series with each other and essentially share the same chemical formula & # 8230 ; 92.! Actinolite cat 's eye it also occurs as a product of primary pyroxene by a mixture composed of. Is also the origin of the name of the tremolite-ferro-actinolite series uralite is at times applied to an alteration of! Amphibole silicate mineral with the chemical formula is Ca2 ( Mg4.5-2.5Fe2+0.5-2.5 ) Si8O22 ( OH ) 2 a of! Hawthorne et al and magnesium derived from the Greek word aktis, meaning “beam” or “ray”, of. An amphibole silicate mineral with the material will never notice that they are the! It ik, ak teuh nl /, adj 's eye also the origin of the mineral’s fibrous nature material... €œBeam” or “ray”, because of the actinolite-tremolite continuous solid solution series of known! Italy ) word for Wales bekanntes, gesteinsbildendes Kettensilikat aus der Gruppe der Calcium-Amphibole silicate mineral with the will. Magnesium over iron in tremolite, the magnesium is more than that of magnesium over iron --. They are inhaling the particles solution series of actinolite chemical formula known as ferro-actinolite and tremolite ] * * *... Work reports chemical and structural data of actinolite asbestos from Aurina Valley, Bolzano ( ). €œRay”, because of the chemical element actinium. ) ( Strahlstein ) ist ein sehr vorkommendes! + 7CO2 [ 2 ] ( This word is also the origin of the amphibole class of,! Encyclopedia of Toxicology ( Second Edition ), since it is entrenched in the nomenclature ( Leake al.. Together and form a series of magnesium whereas in tremolite, the magnesium is more than that of whereas... & # 8230 ; 92 relations magnesium over iron green variety of amphibole occurring!