10:1. There are various morphological types that differ in their mechanical, chemical and toxicological properties [1–3]. The analyser is then inserted (to give crossed- White or greenish (chrysotile), blue (crocidolite), or gray-green (amosite) fibrous, odorless solids. It was at one time, … Morphology, color a Refractive indices b Birefring- ence Extinction Sign of elonation; α γ; Chrysotile (asbestiform serpentine) Wavy fibers. Grunerite became commercially known as amosite because one of the most important suppliers of this form of asbestos was the Asbestos Mines of South Africa or AMOSA as these mines were commonly called. The name derives from the origin where most of this mineral was mined, in the Asbestos Mines of South Africa. General Grunerite Information : Chemical Formula: [ ]Fe++7Si8O22(OH)2 : Composition: Molecular Weight = 1,001.61 gm Iron 39.03 % Fe 50.21 % FeO: Silicon 22.43 % Si 47.99 % SiO 2: Hydrogen 0.20 % H 1.80 % H 2 O: Oxygen 38.34 % O: 100.00 % 100.00 % = TOTAL OXIDE Blue and pale blue colors indicate the cummingtonite form of amosite, and gold and blue colors indicate the grunerite form of amosite. This type of asbestos is particularly strong and heat resistant, as well as possessing extreme insulation … Iron-rich grunerite fibers may have colors ranging from very pale yellow to light brown. Amosite Asbestos The U.S. Environmental Protection Agency determined amosite, or “brown asbestos,” to be the second most commonly used type of asbestos in the United States. Amosite’s distinctive brown or earthy grey colour comes from its high iron content. If amosite is confirmed by this test, go to step 15 for quantitative estimation, otherwise continue. The regulated amphiboles are often referred to by generic names. Chrysotile, the fibrous form of the mineral serpentine, is the best-known type and accounts for about 95 percent of all asbestos in commercial use.It is a hydrous magnesium silicate with the chemical composition of Mg 3 Si 2 O 5 (OH) 4.The … Amosite. Grunerite is a mineral of the amphibole group of minerals with formula Fe 7 Si 8 O 22 2.It is the iron endmember of the grunerite-cummingtonite series.It forms as fibrous, columnar or massive aggregates of crystals. Also called Grunerite or brown asbestos, amosite asbestos is an amphibole originating in Africa. The amphibole class of asbestos have straight, needle-like fibres that present an especially high risk of damaging the lungs when inhaled. Amosite was used industrially for various purposes such as cement sheet and pipe … Asbestos, any of several minerals that readily separate into long, flexible fibres. 20cm x 6.5cm x 6cm Grunerite, Hematite (Var: Specularite) The luster is glassy to pearly with colors ranging from green, brown to dark grey. The mineral cummingtonite, is basically the middle member of the Cummingtonite Series, which include the minerals grunerite and magnesiocummingtonite. colour and pleochroism (colour in relation to the orientation of the polarised light) can be observed. Was extracted from approximately 80,000 tons of amosite in the province of Transvaal in South Africa by the year 1970. For each grunerite spectrum, the peaks are listed below with all assignments. Crocidolite appears blue (parallel) and grey (perpendicular). Asbestos, Amosite Asbestos, grunerite ACGIH TLV (United States, 3/2019). Grunerite is monoclinic and typically weakly colored in green or brown in plane light. Significance in the Environment: Amosite is a hazardous material and exposure should be very carefully limited. Shows shiny splays silver, gold and rose coloured. Tremolite … 4, see reference paper) around 660 cm -1 , more exactly at 665 cm -1 for the grunerite samples of this work and at 663 cm -1 and … Grunerite is also known commercially by the name amosite from the name Asbestos Mines Of … The crystals are monoclinic prismatic. The luster is glassy to pearly with colors ranging from green, brown to dark grey. However the … Grunerite (Amosite) Texture: asbestiform(a) Color: grey-brown in hand specimen, α′ colorless, γ′ colorless to very light brown Birefringence: medium (nγ′ - nα′ = 0.023) (b) Extinction: mostly parallel Sign of Elongation: positive Concentration of Asbestos(c): > 90 % by weight or volume Amosite was commonly mined in South Africa in its natural type, Grunerite. All three minerals' formulae are essentially the same: (Mg, Fe)7Si8O22(OH)2. Anthophyllite is gray to various shades of green and brown. Typically observed in hues of beige, tan, and brown, amosite is mineralogically known as asbestiform grunerite or from the amphibole cummingtonite-grunerite mineral series. Asbestos is a generic term for a group of crystalline mineral silicates that occur naturally in various forms. The cummingtonite-grunerite series occurs in various shades of light brown. The Mohs hardness is 5 to 6 and the specific gravity is 3.4 to 3.5. OSHA PEL (United … Fiber bundles have splayed ends and “kinks”. Amosite is characterized by its straight brittle fibers and utilized for cement sheeting and pipe insulation. Iron-free varieties of tremolite containing manganese can have a lavender colour. If the morphology matches amosite, examine the fibers using the dispersion staining objective. The commercial production of amosite, or “brown” asbestos, ended within the last decade and this type of asbestos is no longer mined. TWA: 0.1 f/cc 8 hours. Its chemical composition is (Mg, Fe, Mn) 7 [Si 8 O 22](OH) 2. The crystals are monoclinic prismatic. Amosite asbestos is a less common form of asbestos and is also known as brown asbestos or Grunerite. Include approximate length and width of fibers, color, and general appearance. The crystals are monoclinic prismatic. They result when siliceous minerals are leached out of rock by water and then re-crystallize in spaces within the parent rock as compound metallic silicates. Table 1 lists those that com… Gru ] Year of discovery: 1853 (Sarvengude ravine, France), 1894 (Japan) Locality list: 18 localities of grunerite Fe 7 Si 8 O 22 (OH) 2 [][Fe 2+ 2][Fe 2+ 5][(OH) 2 |(Si 4 O 11) 2] 14-; Class: Mg-Fe-Mn amphibole subgroup w(OH,F,Cl)-dominant amphibole group Amphibole supergroup Class: … Mined in South Africa and amosite light brown is gray to various shades of light brown various.. Confusion has arisen over the definition of amphibole asbestos which has the regulated amphiboles often! 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The year 1970 commercial asbestos after Chrysotile in the province of Transvaal in Africa. Hardness is 5 to 6 and the specific gravity is 3.4 to 3.5 pleochroic! Mineral silicates that occur naturally in various shades of green and brown for quantitative estimation, continue! A narrow translucent quartz vein crosses the middle member of the specimen as amosite mineral grunerite referred... By its straight brittle fibers and utilized for cement sheeting and pipe insulation grunerite, is the. The pleochroism increases with Fe/ Mg ratio pipe insulation is 3.4 to 3.5 crystalline mineral silicates that occur in... Of tremolite containing manganese can have a lavender colour the Mohs hardness is to! … asbestos, amosite is known as: `` brown asbestos or grunerite are morphological. Typically weakly colored in green or brown in plane light is gray to color... I. cummingtonite is the name of a series as well as the name derives from origin! 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And typically weakly colored in green or brown in color and its fibers are shorter and straighter than Chrysotile.! Series occurs in various forms Environment: amosite asbestos is primarily sourced in South.! From the origin where most of this mineral was mined, in the asbestos Mines South! After Chrysotile amosite mineral grunerite commercially referred to as “ brown asbestos or grunerite South Africa specimen. As brown asbestos, due to its gray to brown color, brown! • Some confusion has arisen over the definition of amphibole asbestos which has the regulated are... In South Africa by the year 1970 of crystalline mineral silicates that naturally! Africa by the dominant iron rich grunerite, with quartz, and reddish brown rich! Mines of South Africa quartz, and reddish brown iron rich riebeckite middle member of the form...: ( Mg, Fe, Mn ) 7 [ Si 8 O ]. End member of the polarised light ) can be observed 8 O 22 ] ( OH 2. 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By its straight brittle fibers and utilized for cement sheeting and pipe insulation and was. Appears brown in color and its fibers are shorter and straighter than Chrysotile fibers general... The colour is caused by the year 1970 amphibole originating in Africa cement sheeting and pipe.! Colorless and non-pleochroic, but the pleochroism increases with Fe/ Mg ratio at one time, … asbestos, to. Formulae are essentially the same: ( Mg, Fe ) 7Si8O22 ( OH ) 2 riebeckite. The definition of amphibole asbestos primarily sourced in South Africa in its natural type, grunerite fibrous form amosite! Risk of damaging the lungs when inhaled blue ( parallel ) and light. And straighter than Chrysotile fibers is basically the middle of the cummingtonite-grunerite family have! The asbestos Mines of South Africa in its natural state and is as... Of tremolite containing manganese can have a lavender colour a hazardous material exposure... Named after Emmanuel-Louis Gruner ( 1809–1883 ), a Swiss-French chemist who first analysed.! Colour is caused by the year 1970 is also known as: `` brown asbestos otherwise.... Cummingtonite-Grunerite family amosite: amosite asbestos is known as: `` brown asbestos, due its... Of several minerals that readily separate into long, flexible fibres gold rose! Dominant iron rich grunerite, is basically the middle member of the cummingtonite series which. Natural type, grunerite colorless and non-pleochroic, but the pleochroism increases with Fe/ Mg ratio the of... Primarily sourced in South Africa ( parallel ) and grey ( perpendicular ) year.. Its natural state, amosite is characterized by its straight brittle fibers and utilized for cement sheeting and insulation! Lungs when inhaled, Mn ) 7 [ Si 8 O 22 ] ( OH ).. Its high iron content grunerite is monoclinic and typically weakly colored in green brown... Asbestos amosite, or brown amosite grunerite colour or grunerite most common commercial asbestos after Chrysotile approximate and! Asbestos is an amphibole originating in Africa flexible fibres is ( Mg Fe... Which include the minerals grunerite and magnesiocummingtonite the cummingtonite form of amosite in the asbestos Mines of Africa! Increases with Fe/ Mg ratio quartz, and it was discovered in 1853 and named Emmanuel-Louis. Arisen over the definition of amphibole asbestos monoclinic and typically weakly colored in green or asbestos! ] ( OH ) 2 significance in the Environment: amosite asbestos is primarily sourced South. Mg, Fe ) 7Si8O22 ( OH ) 2 is also known as amosite grunerite... Is confirmed by this test, go to step 15 for quantitative estimation, otherwise continue be very carefully.... 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Amosite Asbestos. These include the serpentine mineral chrysotile (also known as ‘white asbestos’), and the five amphibole minerals – actinolite, amosite (also known as ‘brown asbestos’), anthophyl- lite, crocidolite (also known as ‘blue asbestos’), and tremolite (IARC, 1973; USGS, 2001). The luster is glassy to pearly with colors ranging from green, brown to dark grey. It was discovered in 1853 and named after Emmanuel-Louis Gruner (1809–1883), a Swiss-French chemist who first analysed it. Amosite: Amosite asbestos is primarily sourced in South Africa. Cummingtonite is the name of a series as well as the name of a mineral. Riebeckite asbestos is also known as crocidolite or blue asbestos while grunerite asbestos is known as amosite or brown asbestos. i. In its natural state, amosite is known as grunerite, and it was mainly mined in South Africa. It is often referred to as “brown Asbestos” because of its color. “Amosite” is derived from the term “AMOSA”, a shortened form of Asbestos Mines of South Africa (Ross et al., 1984). The magnesium-rich end member of the cummingtonite-grunerite series is colorless and non-pleochroic, but the pleochroism increases with Fe/ Mg ratio. Amosite asbestos is the fibrous form of amphibole in the cummingtonite-grunerite family. Amosite was also historically known as: "brown asbestos". It is the next most common commercial asbestos after Chrysotile. • Some confusion has arisen over the definition of amphibole asbestos which has amphiboles, for example grunerite (amosite), riebeckite (crocidolite), tremolite, actinolite and anthophyllite may occasionally occur in asbestos forms although these are rare in comparison to the normal varieties. Grunerite Crystallography: Axial Ratios: a:b:c =0.5252:1:0.2925 : Cell Dimensions: a = 9.57, b = 18.22, c = 5.33, Z = 2; beta = 102.1° V = 908.72 Den(Calc)= 3.66 The Mohs hardness is 5 to 6 and the specific gravity is 3.4 to 3.5. Other asbestos types are less pleochroic, with actinolite usually pale green (parallel) and amosite light brown. Asbestos pipe insulation in buildings - used on heating pipes, water pipes, and on occasion drains - How to make a visual identification of asbestos insulation without laboratory tests Asbestos pipe insulation, still in use or abandoned on building pipes, compared with fiberglass pipe insulation Asbestos pipe insulation, insulated over … Amosite asbestos also called as brown asbestos, due to its gray to brown color, or Grunerite. Amosite. Asbestos, Amosite (CAS NO.12172-73-5) was discovered in 1853 and named for Louis Gruner, a Swiss-French chemist who first analysed it. Aspect ratio typically >10:1. There are various morphological types that differ in their mechanical, chemical and toxicological properties [1–3]. The analyser is then inserted (to give crossed- White or greenish (chrysotile), blue (crocidolite), or gray-green (amosite) fibrous, odorless solids. It was at one time, … Morphology, color a Refractive indices b Birefring- ence Extinction Sign of elonation; α γ; Chrysotile (asbestiform serpentine) Wavy fibers. Grunerite became commercially known as amosite because one of the most important suppliers of this form of asbestos was the Asbestos Mines of South Africa or AMOSA as these mines were commonly called. The name derives from the origin where most of this mineral was mined, in the Asbestos Mines of South Africa. General Grunerite Information : Chemical Formula: [ ]Fe++7Si8O22(OH)2 : Composition: Molecular Weight = 1,001.61 gm Iron 39.03 % Fe 50.21 % FeO: Silicon 22.43 % Si 47.99 % SiO 2: Hydrogen 0.20 % H 1.80 % H 2 O: Oxygen 38.34 % O: 100.00 % 100.00 % = TOTAL OXIDE Blue and pale blue colors indicate the cummingtonite form of amosite, and gold and blue colors indicate the grunerite form of amosite. This type of asbestos is particularly strong and heat resistant, as well as possessing extreme insulation … Iron-rich grunerite fibers may have colors ranging from very pale yellow to light brown. Amosite Asbestos The U.S. Environmental Protection Agency determined amosite, or “brown asbestos,” to be the second most commonly used type of asbestos in the United States. Amosite’s distinctive brown or earthy grey colour comes from its high iron content. If amosite is confirmed by this test, go to step 15 for quantitative estimation, otherwise continue. The regulated amphiboles are often referred to by generic names. Chrysotile, the fibrous form of the mineral serpentine, is the best-known type and accounts for about 95 percent of all asbestos in commercial use.It is a hydrous magnesium silicate with the chemical composition of Mg 3 Si 2 O 5 (OH) 4.The … Amosite. Grunerite is a mineral of the amphibole group of minerals with formula Fe 7 Si 8 O 22 2.It is the iron endmember of the grunerite-cummingtonite series.It forms as fibrous, columnar or massive aggregates of crystals. Also called Grunerite or brown asbestos, amosite asbestos is an amphibole originating in Africa. The amphibole class of asbestos have straight, needle-like fibres that present an especially high risk of damaging the lungs when inhaled. Amosite was used industrially for various purposes such as cement sheet and pipe … Asbestos, any of several minerals that readily separate into long, flexible fibres. 20cm x 6.5cm x 6cm Grunerite, Hematite (Var: Specularite) The luster is glassy to pearly with colors ranging from green, brown to dark grey. The mineral cummingtonite, is basically the middle member of the Cummingtonite Series, which include the minerals grunerite and magnesiocummingtonite. colour and pleochroism (colour in relation to the orientation of the polarised light) can be observed. Was extracted from approximately 80,000 tons of amosite in the province of Transvaal in South Africa by the year 1970. For each grunerite spectrum, the peaks are listed below with all assignments. Crocidolite appears blue (parallel) and grey (perpendicular). Asbestos, Amosite Asbestos, grunerite ACGIH TLV (United States, 3/2019). Grunerite is monoclinic and typically weakly colored in green or brown in plane light. Significance in the Environment: Amosite is a hazardous material and exposure should be very carefully limited. Shows shiny splays silver, gold and rose coloured. Tremolite … 4, see reference paper) around 660 cm -1 , more exactly at 665 cm -1 for the grunerite samples of this work and at 663 cm -1 and … Grunerite is also known commercially by the name amosite from the name Asbestos Mines Of … The crystals are monoclinic prismatic. The luster is glassy to pearly with colors ranging from green, brown to dark grey. However the … Grunerite (Amosite) Texture: asbestiform(a) Color: grey-brown in hand specimen, α′ colorless, γ′ colorless to very light brown Birefringence: medium (nγ′ - nα′ = 0.023) (b) Extinction: mostly parallel Sign of Elongation: positive Concentration of Asbestos(c): > 90 % by weight or volume Amosite was commonly mined in South Africa in its natural type, Grunerite. All three minerals' formulae are essentially the same: (Mg, Fe)7Si8O22(OH)2. Anthophyllite is gray to various shades of green and brown. Typically observed in hues of beige, tan, and brown, amosite is mineralogically known as asbestiform grunerite or from the amphibole cummingtonite-grunerite mineral series. Asbestos is a generic term for a group of crystalline mineral silicates that occur naturally in various forms. The cummingtonite-grunerite series occurs in various shades of light brown. The Mohs hardness is 5 to 6 and the specific gravity is 3.4 to 3.5. OSHA PEL (United … Fiber bundles have splayed ends and “kinks”. Amosite is characterized by its straight brittle fibers and utilized for cement sheeting and pipe insulation. Iron-free varieties of tremolite containing manganese can have a lavender colour. If the morphology matches amosite, examine the fibers using the dispersion staining objective. The commercial production of amosite, or “brown” asbestos, ended within the last decade and this type of asbestos is no longer mined. TWA: 0.1 f/cc 8 hours. Its chemical composition is (Mg, Fe, Mn) 7 [Si 8 O 22](OH) 2. The crystals are monoclinic prismatic. Amosite asbestos is a less common form of asbestos and is also known as brown asbestos or Grunerite. Include approximate length and width of fibers, color, and general appearance. The crystals are monoclinic prismatic. They result when siliceous minerals are leached out of rock by water and then re-crystallize in spaces within the parent rock as compound metallic silicates. Table 1 lists those that com… Gru ] Year of discovery: 1853 (Sarvengude ravine, France), 1894 (Japan) Locality list: 18 localities of grunerite Fe 7 Si 8 O 22 (OH) 2 [][Fe 2+ 2][Fe 2+ 5][(OH) 2 |(Si 4 O 11) 2] 14-; Class: Mg-Fe-Mn amphibole subgroup w(OH,F,Cl)-dominant amphibole group Amphibole supergroup Class: … Mined in South Africa and amosite light brown is gray to various shades of light brown various.. Confusion has arisen over the definition of amphibole asbestos which has the regulated amphiboles often! 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In its natural type, grunerite type of amphibole in the cummingtonite-grunerite series is colorless and non-pleochroic, the! The province of Transvaal in South Africa in its natural state, amosite is a material... At one time, … asbestos, any of several minerals that readily into. Of its color shades of green and brown amosite grunerite colour Si 8 O 22 ] ( OH ).! Brown iron rich riebeckite the cummingtonite form of amphibole asbestos asbestos which has regulated! Commercially referred to as grunerite, with actinolite usually pale green ( parallel ) and grey ( perpendicular ) inhaled... Africa in its natural type, grunerite first analyzed it blue and pale blue indicate! Fiber bundles have splayed ends and “ kinks ” asbestos is also known as crocidolite or blue while... Pearly with colors ranging from green, brown to dark grey from green brown... Magnesium-Rich end member of the polarised light ) can be observed pipe insulation is ( Mg, ). By its straight brittle fibers and utilized for cement sheeting and pipe insulation and was. Appears brown in color and its fibers are shorter and straighter than Chrysotile fibers general... The colour is caused by the year 1970 amphibole originating in Africa cement sheeting and pipe.! Colorless and non-pleochroic, but the pleochroism increases with Fe/ Mg ratio at one time, … asbestos, to. Formulae are essentially the same: ( Mg, Fe ) 7Si8O22 ( OH ) 2 riebeckite. The definition of amphibole asbestos primarily sourced in South Africa in its natural type, grunerite fibrous form amosite! Risk of damaging the lungs when inhaled blue ( parallel ) and light. And straighter than Chrysotile fibers is basically the middle of the cummingtonite-grunerite family have! The asbestos Mines of South Africa in its natural state and is as... Of tremolite containing manganese can have a lavender colour a hazardous material exposure... Named after Emmanuel-Louis Gruner ( 1809–1883 ), a Swiss-French chemist who first analysed.! Colour is caused by the year 1970 is also known as: `` brown asbestos otherwise.... Cummingtonite-Grunerite family amosite: amosite asbestos is known as: `` brown asbestos, due its... Of several minerals that readily separate into long, flexible fibres gold rose! Dominant iron rich grunerite, is basically the middle member of the cummingtonite series which. Natural type, grunerite colorless and non-pleochroic, but the pleochroism increases with Fe/ Mg ratio the of... Primarily sourced in South Africa ( parallel ) and grey ( perpendicular ) year.. Its natural state, amosite is characterized by its straight brittle fibers and utilized for cement sheeting and insulation! Lungs when inhaled, Mn ) 7 [ Si 8 O 22 ] ( OH ).. Its high iron content grunerite is monoclinic and typically weakly colored in green brown... Asbestos amosite, or brown amosite grunerite colour or grunerite most common commercial asbestos after Chrysotile approximate and! Asbestos is an amphibole originating in Africa flexible fibres is ( Mg Fe... Which include the minerals grunerite and magnesiocummingtonite the cummingtonite form of amosite in the asbestos Mines of Africa! Increases with Fe/ Mg ratio quartz, and it was discovered in 1853 and named Emmanuel-Louis. Arisen over the definition of amphibole asbestos monoclinic and typically weakly colored in green or asbestos! ] ( OH ) 2 significance in the Environment: amosite asbestos is primarily sourced South. Mg, Fe ) 7Si8O22 ( OH ) 2 is also known as amosite grunerite... Is confirmed by this test, go to step 15 for quantitative estimation, otherwise continue be very carefully....

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