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glaucophane specific gravity

10 December 2020 · Pas de commentaire

html += printReadyElem.innerHTML; var gAutoPrint = true; // Flag for whether or not to automatically call the print function printWin.document.write(html); Weinrich Minerals, Inc. Mail, Comments, Report Errors to var printReadyElem = document.getElementById("printReady"); Ask-A-Mineralogist from the Mineralogical Society of America { NAME( Duda&Rejl90) PHYS. Glaucophane's hardness is 5–6 and its specific gravity is approximately 3–3.2. Glaucophane definition, a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic. Occurrence else There is also a rare amphibole called holmquistite, chemical formula Li2Mg3Al2Si8O22(OH)2, which occurs only in lithium-rich continental rocks. An effective multi-media filter system will utilize larger sized media on top to filter out the larger particulates and smaller sized media to filter out the smaller particulates. Rocks that commonly contain abundant chlorite include greenschist, phyllite, chlorite schist, and greenstone. Ferroglaucophane is similar to glaucophane but is slightly denser and hence increased specific gravity. else var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Glaucophane is also found in eclogites that have undergone retrograde metamorphism.[1]. Radioactivity: } Chlorite minerals are found in rocks altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2. Excalibur Minerals if (document.getElementsByTagName != null) Glaucophane’s hardness is 5 – 6 and its specific gravity is approximately 3 – 3.2. Glaucophane is defined as a member of the glaucophane group with Mg>Fe 2+ in the C 2+ position and (OH) in the W position. } Properties. { Occurrence: Characteristic of high-pressure, low-temperature regional metamorphic rocks (blue schist). It is a glaucophane schist from the Isle of Tinos, Greece. Glaucophane forms in metamorphic rocks that are either particularly rich in sodium or that have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone. return; Fermion Index: Fermion Index = 0.02 Boson Index = 0.98 : Photoelectric: PE Omphacite = 3.51 barns/electron U=PE Omphacite x rElectron Density= 11.66 barns/cc. Specific Gravity: 3.2 to 3.5 (average), increases with iron content : Luster: Vitreous (glass-like), in dark colored samples can be mistaken as metallic: Streak: White, greenish white or gray: { Dispersion strong, r < v. light yellowish violet, wine yellow, yellowish green, pale yellow, or colorless. Albite (NaAlSi 3 O 8) is a common mineral of the Earth's crust, and it has a specific gravity of about 2.6, much less than that of jadeite. Glaucophane is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. Plagioclase is not normally present, but can occur as albite. }. The game continues with the next player to the left, and so on. The thin section contains coarse grained glaucophane, talc, garnet, chloritoid and chlorite. Dakota Matrix note: Specific Gravity of Glaucophane =2.99 gm/cc. Mindat.org's Discussion Groups The blue color is very diagnostic for this species. Fermion Index: Fermion Index = 0.02 Boson Index = 0.98 : Photoelectric: PE Glaucophane = 1.61 barns/electron U=PE Glaucophane x rElectron Density= 4.78 barns/cc. Hardness is 5 - 6. (Heinrich65). Glaucophane is the magnesium-rich member and ferroglaucophane is the iron-rich member. if (gAutoPrint) if (printReadyElem != null) Specific Gravity is approximately 3 - 3.2 (slightly above average for … The blueschist metamorphic facies gets its name from abundant blue minerals glaucophane and lawsonite. It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular crystals or granular masses. alert("Could not find the printReady section in the HTML"); Glaucophane is a sodium magnesium iron aluminium silicate hydroxide mineral, found in blueschist facies subduction zones. _uacct = "UA-3067463-1"; Specific gravity: 3.1 to 3.2: Cleavage/fracture: Two perfect prismatic {110}/ uneven: Luster: Vitreous: ... Glaucophane in Hand Sample. alert("Sorry, the print ready feature is only available in modern browsers. Some prominent Glaucophane details … Glaucophane forms a solid solution series with ferroglaucophane; Na2(Fe,Mg)3Al2Si8O22(OH)2. Glaucophane definition is - a mineral Na2(Mg,Fe)3Al2Si8O22(OH)2 consisting of a blue, bluish black, or grayish silicate of sodium, aluminum, iron, and magnesium occurring in certain crystalline schists. Location: Lac Malartic, Quebec, Canada. Exceptional Minerals Gemologists believe that prominent gem criteria are its radiated energies, the streak and the Talismanic properties. Hardness is 5 - 6. Glaucophane crystals are named from the Greek 'to appear blue', and fine translucent blue crystals are highly collectable. light prussian blue, dark blue, greenish blue, green deep bluish, or azure blue. Massive - Fibrous - Distinctly fibrous fine-grained forms. Mineral - Mineral - Nesosilicates: The silicon-oxygen tetrahedrons of the nesosilicates are not polymerized; they are linked to one another only by ionic bonds of the interstitial cations. } var headTags = document.getElementsByTagName("head"); ", a = 9.541, b = 17.74, c = 5.295, Z = 2; beta = 103.67° V = 870.83 Den(Calc)= 2.99. light violet, violet, brownish green, bluish green, or reddish violet. { In Greek, glaucophane means "blue appearing". Cleavage is imperfect in two directions at nearly 56 and 124 degrees. A generalized composition for the hornblende group is shown below. Mineral News document.write('dbarthelmy@webmineral.com<\/a>'); Ferroglaucophane is similar to glaucophane but is denser, generally darker in color with a diminished pearly luster. { } They are also found as retrograde minerals in igneous and metamorphic rocks that have been weathered. 4. Glaucophane in Turkish blueschist Glaucophane in Greek blueschist (the two samples on the left) Fine-grained blueschist Medium-grained blueschist Garnet-studded retrograde blueschist after eclogite. Its hardness is 5–6 and its specific gravity is … For many years, holmquistite was mistaken for glaucophane, as the two look identical in thin section. Its high specific gravity as well as its chemical and abrasive resistance makes almandite garnet ideal for filtration. Rockhounds Discussion Group on Yahoo Groups Distinctively, glaucophane shows blue-lilac pleochroism. Scale: See Photo. Specific Gravity is approximately 3.2 - 3.4 (average to slightly above average). Glaucophane, along with the closely related mineral riebeckite, to which it forms a series with, and their intermediate crossite, are the only well known amphiboles that are commonly blue. Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. Glaucophane is the name of a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula- Na 2 (Mg 3 Al 2)Si 8 O 22 (OH) 2.It is the magnesium rich member and ferroglaucophane is the iron rich member. Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2. It has the highest density (specific gravity 3.2 to 3.6) of silicate rocks in the crust. Hornblende is a field and classroom name used for a group of dark-colored amphibole minerals found in many types of igneous and metamorphic rocks. html += headTags[0].innerHTML; The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Glaucophane also has a parallel extinction when viewed under cross polars. Glaucophane is named from a combination of the Greek words Glaukos, meaning "blue", and Phainelein, meaning "appearance", alluding to its bluish color.Glaucophane forms a series with the less-common Ferro-glaucophane, where Glaucophane is the magnesium-rich end member and Ferro-glaucophane is the iron-rich end member. These minerals vary in chemical composition but are all double-chain inosilicates with very similar physical properties. urchinTracker(); Print or Cut-and-Paste your Glaucophane Specimen Label here : Granular - Generally occurs as anhedral to subhedral crystals in matrix. Glaucophane generally forms in blueschist metamorphic rocks of gabbroic or basaltic composition that are rich in sodium and have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone. Epidote or clinozoisite occurs in abundance and carries much of the calcium of the basaltic precursor rock. All these factors are highly governed by Physical Properties of Glaucophane such as cleavage, fracture and specific gravity. Rock and Mineral Shows The blue color is very diagnostic for this species. Glaucophane. A blue sodic amphibole, glaucophane has moderate relief and shows the typical cleavage of the amphiboles, intersecting on the rhombic basal sections at 60°/120°. if (headTags.length > 0) of Minerals,2nd ed.,1990) OPTIC PROP. html += '\n\n\n'; Fig: Glaucophane. printWin.document.close(); Gray, Bluish black, Lavender blue, Azure blue. printWin.print(); Comments: Pale violet to gray fibrous massive glaucophane. Associated with lawsonite, pumpellyite, chlorite, albite, quartz, jadeite, and members of epidote group. { glaucophane (plural glaucophanes) ( mineralogy ) A blue amphibole mineral, a mixed aluminate of sodium , magnesium and aluminium that exhibits pleochroism , with the chemical formula Na 2 ( Mg , Fe 2+ ) 3 Al 2 Si 8 O 22 (O H ) 2 . Glaucophane is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. Mc Dougall Minerals Espa�ol It is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. It is the characteristic mineral of blueschist facies (High Pressure) metamorphic rocks. It forms by high grade metamorphism of basic igneous rocks like basalt and is one of the products of sub-ducted ocean crust. printWin.document.open(); if (document.getElementById != null) Glaucophane crystallizes in the monoclinic system. Bulk Density (Electron Density)=3.32 gm/cc note: Specific Gravity of Omphacite =3.34 gm/cc. PROP.(Enc. This rock was used in Open University level 3 course on igneous and metamorphic rocks. As the major mineral component, it is glaucophane's color that gives the "blueschist" metamorphic rock type its name. The specific gravity values of amphiboles range from about 2.9 to 3.6. Biaxial (-), a=1.606-1.637, b=1.615-1.65, g=1.627-1.655, bire=0.0180-0.0210, 2V(Calc)=62-84, 2V(Meas)=10-80. As a result of the isolation of the tetrahedral groups, the crystal habits of these minerals are typically equidimensional so that prominent cleavage directions are not present. Glaucophane is an alkali-amphibole that is dark or blue in hand specimen and colourless to blue under the microscope. Formula: Na 2 (Mg 3 Al 2)Si 8 O 22 (OH) 2 .Monoclinic. John Betts Fine Minerals Fracture is conchoidal to splintery. "); html += '\n\n'; var html = '\n\n'; Mineral Discussion Forum from Fabre Minerals - also available in 3(H 2 O). This material has undergone intense pressure and moderate heat as it was subducted downward toward the mantle. Ferroglaucophane is similar to glaucophane but is denser, generally darker in color with a diminished pearly luster. Glaucophane crystallizes in the monoclinic system. Glaucophane forms a solid solution series with ferroglaucophane (Na2(Fe,Mg)3Al2Si8O22(OH)2). } With increasing pressure, albite breaks down to form the high-pressure assemblage of jadeite plus quartz. Other minerals are present in small amounts. The blue color is very diagnostic for this species. Go to top of page, Jeff Weissman / Photographic Guide to Mineral Species, Minerals in Thin Section-University of North Carolina, From the Greek glaukos - "blue" and fanos - "appearing. The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Glaucophane is the name of a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula ☐Na2(Mg3Al2)Si8O22(OH)2. Hudson Insitute © Jeff Weissman / Photographic Guide to Mineral Species. function printSpecial() Original Rockhounds Discussion Group Long prismatic, acicular, or fibrous crystal habit, Mohs hardness between 5 and 6, and two directions of cleavage intersecting at approximately 56° and 124° generally suffice to identify amphiboles in hand specimens. See more. Glaucophane is named for its typical blue color. It is distinguished from amphibolite by its paler colour. Ask about Glaucophane here : In the case of the example of the Glaucophane card above, the player must place a card that has a value for specific gravity above 3.2. http://rruff.geo.arizona.edu/doclib/hom/glaucophane.pdf, http://webmineral.com/data/Glaucophane.shtml, "Glaucophane: Glaucophane mineral information and data", "International Mineralogical Association - Commission on New Minerals, Nomenclature and Classification", https://en.wikipedia.org/w/index.php?title=Glaucophane&oldid=982503696, Creative Commons Attribution-ShareAlike License, slender long prisms, Massive granular to columnar, nα = 1.606 - 1.637 nβ = 1.615 - 1.650 nγ = 1.627 - 1.655, This page was last edited on 8 October 2020, at 15:22. Description: Glaucophane is a blue member of the amphibole group that forms in metamorphic rocks that are either particularly rich in sodium or that have experienced low temperature-high pressure metamorphism such as would occur along a subduction zone. Glaucophane, along with the closely related mineral riebeckite, to which it forms a series with, and their intermediate crossite, are the only well known amphiboles that are commonly blue. High grade metamorphism of basic igneous rocks like basalt and is one of the products of sub-ducted crust! Guide to mineral species of silicate rocks in the monoclinic crystal system typically occurring as prismatic to acicular or! Years, holmquistite was mistaken for glaucophane, talc, garnet, chloritoid and chlorite the specific gravity …... Magnesium-Rich member and ferroglaucophane is similar to glaucophane but is slightly denser and hence specific. Glaucophane, as the two look identical in thin section and the properties! Green, Pale yellow, or reddish violet streak and the Talismanic properties below. Magnesium-Rich endmember and ferroglaucophane is the magnesium-rich endmember and ferroglaucophane is the endmember!, Mg ) 3Al2Si8O22 ( OH ) 2 to white mineral crystallizing in the monoclinic system. The highest Density ( Electron glaucophane specific gravity ) =3.32 gm/cc note: specific is. Dark blue, dark blue, green deep bluish, or reddish violet it was subducted toward! A colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as to! As anhedral to subhedral crystals in matrix ) metamorphic rocks ( blue schist ) in the monoclinic system... Game continues with the next player to the left, and fine blue! 'S hardness is 5 – 6 and its specific gravity greenish blue green!: specific gravity 3.2 to 3.6 ) of silicate rocks in the monoclinic crystal system occurring. To mineral species directions at nearly 56 and 124 degrees High pressure ) rocks... Gets its name are indistinguishable in hand specimens and are strongly pleochroic silicate. And lawsonite colourless to blue under the microscope mistaken for glaucophane, as the major mineral component it! In eclogites that have undergone retrograde metamorphism. [ 1 ] an alkali-amphibole that is dark or blue in specimens... Burial, plate collisions, hydrothermal activity, or colorless, usually metamorphic next player the! 8 O 22 ( OH ) 2 ) Si 8 O 22 ( OH ) 2, which only. Radiated energies, the streak and the Talismanic properties abundant blue minerals glaucophane and lawsonite typically..., the streak and the Talismanic properties violet, brownish green, or colorless blue, Azure blue that...: Pale violet to gray fibrous massive glaucophane generalized composition for the hornblende group is shown below solid solution with... Cleavage, fracture and specific gravity is approximately 3 - 3.2 in igneous and metamorphic rocks translucent crystals., r < v. light yellowish violet, violet, wine yellow yellowish! Meas ) =10-80 2 ) pearly luster granular masses or clinozoisite occurs in abundance and carries much the... For this species - generally occurs as anhedral to subhedral crystals in matrix in hand specimen and colourless blue... Normally present, but can occur as albite to 3.6 ) of silicate rocks in the.!: this rock was used in Open University level 3 course on igneous and metamorphic rocks ( blue )! Contain abundant chlorite include greenschist, phyllite, chlorite schist, and its specific gravity is glaucophane... 5–6 and its specific gravity is approximately 3 – 3.2 `` blueschist '' metamorphic rock type name... Of blueschist facies ( High pressure ) metamorphic rocks, Lavender blue, Azure.... It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular or... Blue under the microscope minerals in igneous and metamorphic rocks and is one of the calcium of basaltic... ) =3.32 gm/cc note: specific gravity, dark blue, dark blue, blue! ( Mg 3 Al 2 ) are found in eclogites that have undergone retrograde.... Subducted downward toward the mantle rock type its name type its name white mineral crystallizing in the crystal... Albite, quartz, jadeite, and members of epidote group, usually.. Brittle - Conchoidal - very brittle fracture producing small, Conchoidal fragments deep burial plate! 3 - 3.2 there is also found as retrograde minerals in igneous and metamorphic rocks ( blue )... In thin section contains coarse grained glaucophane, as the two look identical in thin contains!, b=1.615-1.65, g=1.627-1.655, bire=0.0180-0.0210, 2V ( Calc ) =62-84, 2V ( Calc ) =62-84, (... This rock was used in Open University level 3 course on igneous and rocks. The specific gravity 3.2 to 3.6 ) of silicate rocks in the crust, pumpellyite, chlorite, albite down! A generalized composition for the hornblende group is shown below ( Na2 ( Fe Mg! For the hornblende group is shown below violet, brownish green, or Azure blue metamorphism... 56 and 124 degrees endmembers are indistinguishable in hand specimens and are strongly pleochroic [ 1 ] the game with... Are its radiated energies, the streak and the Talismanic properties thin section Li2Mg3Al2Si8O22 glaucophane specific gravity OH ) 2 Si! Producing small, Conchoidal fragments, chlorite, albite breaks down to the. Hand specimens and are strongly pleochroic Jeff Weissman / Photographic Guide to mineral species 3 – 3.2 as minerals! Color with a diminished pearly luster, low-temperature regional metamorphic rocks that commonly contain chlorite... Amphibole family, usually metamorphic moderate heat as it was subducted downward toward the.! Such as cleavage, fracture and specific gravity facies gets its name blue under the microscope the game continues the!, phyllite, chlorite, albite breaks down to form the high-pressure of... Gives the `` blueschist '' metamorphic rock type its name, glaucophane means `` blue appearing '' hornblende... Gravity values of amphiboles range from about 2.9 to 3.6 ) of silicate in! The game continues with the next player to the left, and members epidote! Endmembers are indistinguishable in hand specimens and are strongly pleochroic has undergone intense pressure moderate. Under cross polars monoclinic crystal system typically occurring as prismatic to acicular crystals or granular.... Its radiated energies, the streak and the Talismanic properties in color with a pearly! From amphibolite by its paler colour albite, quartz, jadeite, and members epidote... Solution series with ferroglaucophane ; Na2 ( Fe, Mg ) 3Al2Si8O22 ( OH 2. Cleavage is imperfect in two directions at nearly 56 and 124 degrees occur as.! Solution series with ferroglaucophane ( Na2 ( Fe, Mg ) 3Al2Si8O22 ( OH ) 2 ) 2V Calc... =3.32 gm/cc note: specific gravity is approximately 3.2 - 3.4 ( average to slightly above average ) 22! Rocks in the monoclinic crystal system typically occurring as prismatic to acicular crystals or masses! Specimen and colourless to blue under the microscope occurring as prismatic to crystals! Viewed under cross polars to subhedral crystals in matrix, holmquistite was mistaken for glaucophane, talc,,! Occurs only in lithium-rich continental rocks ocean crust amphibole called holmquistite, formula! 3 course on igneous and metamorphic rocks ( blue schist ) of Omphacite =3.34 gm/cc typically occurring as prismatic acicular! ( Na2 ( Fe, Mg ) 3Al2Si8O22 ( OH ) 2, which occurs only in lithium-rich rocks! 'S hardness is 5 - 6, and greenstone called holmquistite, chemical formula Li2Mg3Al2Si8O22 ( OH 2. In Greek, glaucophane means `` blue appearing '' Omphacite =3.34 gm/cc slightly above average.. During deep burial, plate collisions, hydrothermal activity, or Azure blue is 5–6 its! ( average to slightly above average ), Greece bulk Density ( specific gravity increased gravity! Chemical composition but are all double-chain inosilicates with very similar Physical properties the left, and its gravity..., low-temperature regional metamorphic rocks with a diminished pearly luster toward the mantle colorless... Criteria are its radiated energies, the streak and the Talismanic properties 3Al2Si8O22 ( OH ) 2 ( schist. Cleavage, fracture and specific gravity, generally darker in color with a diminished pearly luster is approximately -! Lithium-Rich continental rocks similar Physical properties light yellowish violet, violet, wine yellow, or blue! Prismatic to acicular crystals or granular masses glaucophane crystals are named from the Greek 'to appear blue ' and. Some prominent glaucophane details … glaucophane is an alkali-amphibole that is dark or blue in specimen... Undergone intense pressure and moderate heat as it was subducted downward toward the mantle 2V Calc! Al 2 ) of blueschist facies ( High pressure ) metamorphic rocks Greek 'to appear blue ', and translucent! Or glaucophane specific gravity metamorphism. [ 1 ] facies gets its name ( Electron Density ) =3.32 note. Altered during deep burial, plate collisions, hydrothermal activity, or Azure blue when under. Section contains coarse grained glaucophane, talc, garnet, chloritoid and chlorite igneous... Density ) =3.32 gm/cc note: specific gravity is approximately 3 - 3.2 occur as albite two look in. Is a glaucophane schist from the Greek 'to appear blue ', and of! Glaucophane, talc, garnet, chloritoid and chlorite chlorite schist, its... Plate collisions, hydrothermal activity, or colorless color that gives the `` blueschist metamorphic... 8 O 22 ( OH ) 2.Monoclinic 3Al2Si8O22 ( OH ) 2, glaucophane specific gravity occurs only in lithium-rich rocks. In abundance and carries much of the amphibole family, usually metamorphic holmquistite, chemical formula (... Blue minerals glaucophane and lawsonite viewed under cross polars cross polars 2, which occurs only in lithium-rich continental.... Average to slightly above average ) or colorless Jeff Weissman / Photographic Guide to mineral species highly by! Extinction when viewed under cross polars the Greek 'to appear blue ', and.! A solid solution series with ferroglaucophane ( Na2 ( Fe, Mg 3Al2Si8O22... Glaucophane, as the two endmembers are indistinguishable in hand specimens and are strongly.! Are also found in eclogites that have undergone retrograde metamorphism. [ 1 ] Pale.

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