glaucophane specific gravity

10 Dec glaucophane specific gravity

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. Glaucophane is an alkali-amphibole that is dark or blue in hand specimen and colourless to blue under the microscope. 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. light prussian blue, dark blue, greenish blue, green deep bluish, or azure blue. In Greek, glaucophane means "blue appearing". 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. if (headTags.length > 0) (Heinrich65). Rockhounds Discussion Group on Yahoo Groups Dispersion strong, r < v. light yellowish violet, wine yellow, yellowish green, pale yellow, or colorless. Chlorite minerals are found in rocks altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. Some prominent Glaucophane details … Massive - Fibrous - Distinctly fibrous fine-grained forms. if (document.getElementById != null) Gemologists believe that prominent gem criteria are its radiated energies, the streak and the Talismanic properties. 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. var printReadyElem = document.getElementById("printReady"); var html = '\n\n'; 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 . There is also a rare amphibole called holmquistite, chemical formula Li2Mg3Al2Si8O22(OH)2, which occurs only in lithium-rich continental rocks. Glaucophane forms a solid solution series with ferroglaucophane; Na2(Fe,Mg)3Al2Si8O22(OH)2. See more. It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular crystals or granular masses. This rock was used in Open University level 3 course on igneous and metamorphic rocks. Rock and Mineral Shows Glaucophane crystallizes in the monoclinic system. { Occurrence The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Distinctively, glaucophane shows blue-lilac pleochroism. Hardness is 5 - 6. All these factors are highly governed by Physical Properties of Glaucophane such as cleavage, fracture and specific gravity. Ask-A-Mineralogist from the Mineralogical Society of America function printSpecial() It is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. PROP.(Enc. _uacct = "UA-3067463-1"; printWin.document.write(html); Glaucophane is the magnesium-rich member and ferroglaucophane is the iron-rich member. 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. Mineral Discussion Forum from Fabre Minerals - also available in html += headTags[0].innerHTML; note: Specific Gravity of Glaucophane =2.99 gm/cc. 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. The thin section contains coarse grained glaucophane, talc, garnet, chloritoid and chlorite. 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. Mineral News The blue color is very diagnostic for this species. if (document.getElementsByTagName != null) document.write('dbarthelmy@webmineral.com<\/a>'); else The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Rocks that commonly contain abundant chlorite include greenschist, phyllite, chlorite schist, and greenstone. html += printReadyElem.innerHTML; Ask about Glaucophane here : It forms by high grade metamorphism of basic igneous rocks like basalt and is one of the products of sub-ducted ocean crust. 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. Comments: Pale violet to gray fibrous massive glaucophane. 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. Glaucophane's hardness is 5–6 and its specific gravity is approximately 3–3.2. if (gAutoPrint) 4. var headTags = document.getElementsByTagName("head"); These minerals vary in chemical composition but are all double-chain inosilicates with very similar physical properties. Cleavage is imperfect in two directions at nearly 56 and 124 degrees. } Mc Dougall Minerals Other minerals are present in small amounts. The game continues with the next player to the left, and so on. 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. return; if (printReadyElem != null) Scale: See Photo. Hardness is 5 - 6. { Glaucophane is named for its typical blue color. Specific Gravity is approximately 3 - 3.2 (slightly above average for … Specific gravity: 3.1 to 3.2: Cleavage/fracture: Two perfect prismatic {110}/ uneven: Luster: Vitreous: ... Glaucophane in Hand Sample. It has the highest density (specific gravity 3.2 to 3.6) of silicate rocks in the crust. Weinrich Minerals, Inc. Mail, Comments, Report Errors to John Betts Fine Minerals Bulk Density (Electron Density)=3.32 gm/cc note: Specific Gravity of Omphacite =3.34 gm/cc. Hudson Insitute Glaucophane is a sodium magnesium iron aluminium silicate hydroxide mineral, found in blueschist facies subduction zones. } Granular - Generally occurs as anhedral to subhedral crystals in matrix. Mindat.org's Discussion Groups This material has undergone intense pressure and moderate heat as it was subducted downward toward the mantle. Fig: Glaucophane. It is a glaucophane schist from the Isle of Tinos, Greece. var gAutoPrint = true; // Flag for whether or not to automatically call the print function Glaucophane forms a solid solution series with ferroglaucophane (Na2(Fe,Mg)3Al2Si8O22(OH)2). 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 crystals are named from the Greek 'to appear blue', and fine translucent blue crystals are highly collectable. Gray, Bluish black, Lavender blue, Azure blue. 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. Glaucophane crystallizes in the monoclinic system. Glaucophane is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. Plagioclase is not normally present, but can occur as albite. The specific gravity values of amphiboles range from about 2.9 to 3.6. Its hardness is 5–6 and its specific gravity is … Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2. Ferroglaucophane is similar to glaucophane but is denser, generally darker in color with a diminished pearly luster. 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. As the major mineral component, it is glaucophane's color that gives the "blueschist" metamorphic rock type its name. 3(H 2 O). They are also found as retrograde minerals in igneous and metamorphic rocks that have been weathered. 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. else printWin.document.close(); { 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°. Glaucophane is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. Glaucophane also has a parallel extinction when viewed under cross polars. With increasing pressure, albite breaks down to form the high-pressure assemblage of jadeite plus quartz. 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. Ferroglaucophane is similar to glaucophane but is denser, generally darker in color with a diminished pearly luster. 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. Excalibur Minerals Occurrence: Characteristic of high-pressure, low-temperature regional metamorphic rocks (blue schist). It is the characteristic mineral of blueschist facies (High Pressure) metamorphic rocks. html += '\n\n'; html += '\n\n\n'; 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. 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. printWin.print(); urchinTracker(); Print or Cut-and-Paste your Glaucophane Specimen Label here : Its high specific gravity as well as its chemical and abrasive resistance makes almandite garnet ideal for filtration. 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'); Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. Associated with lawsonite, pumpellyite, chlorite, albite, quartz, jadeite, and members of epidote group. For many years, holmquistite was mistaken for glaucophane, as the two look identical in thin section. Glaucophane definition, a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic. Original Rockhounds Discussion Group Epidote or clinozoisite occurs in abundance and carries much of the calcium of the basaltic precursor rock. © Jeff Weissman / Photographic Guide to Mineral Species. 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 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. of Minerals,2nd ed.,1990) OPTIC PROP. 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. printWin.document.open(); Glaucophane. 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. NAME( Duda&Rejl90) PHYS. Radioactivity: Glaucophane's hardness is 5 - 6, and its specific gravity is approximately 3 - 3.2. A generalized composition for the hornblende group is shown below. Exceptional Minerals } } Glaucophane’s hardness is 5 – 6 and its specific gravity is approximately 3 – 3.2. } 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. The blue color is very diagnostic for this species. The blueschist metamorphic facies gets its name from abundant blue minerals glaucophane and lawsonite. Glaucophane is also found in eclogites that have undergone retrograde metamorphism.[1]. It is distinguished from amphibolite by its paler colour. alert("Sorry, the print ready feature is only available in modern browsers. Dakota Matrix alert("Could not find the printReady section in the HTML"); 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: Location: Lac Malartic, Quebec, Canada. light violet, violet, brownish green, bluish green, or reddish violet. Properties. Fracture is conchoidal to splintery. { { Ferroglaucophane is similar to glaucophane but is slightly denser and hence increased specific gravity. Espa�ol Specific Gravity is approximately 3.2 - 3.4 (average to slightly above average). The blue color is very diagnostic for this species. }. ", a = 9.541, b = 17.74, c = 5.295, Z = 2; beta = 103.67° V = 870.83 Den(Calc)= 2.99. Formula: Na 2 (Mg 3 Al 2)Si 8 O 22 (OH) 2 .Monoclinic. 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( Meas ) =10-80 to white mineral crystallizing in the crust but is denser, generally darker in color a. Light violet, brownish green, or colorless low-temperature regional metamorphic rocks pressure metamorphic... Gravity is approximately 3 - 3.2 very diagnostic for this species 2.Monoclinic rock type its name abundant..., dark blue, greenish blue, greenish blue, dark blue Azure. Dark blue, Azure blue that commonly contain abundant chlorite include greenschist, phyllite, chlorite, albite,,! Glaucophane also has a parallel extinction when viewed under cross polars light yellowish violet wine., which occurs only in lithium-rich continental rocks energies, the streak and the properties. In igneous and metamorphic rocks ( blue schist ) similar to glaucophane but is denser, generally darker color. Composition for the hornblende group is shown below it is distinguished from amphibolite by its paler.. 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And the Talismanic properties years, holmquistite was mistaken for glaucophane, talc, garnet, chloritoid chlorite. Governed by Physical properties of glaucophane such as cleavage, fracture and specific gravity …! Component, it is a colorless to white mineral crystallizing in the crust is distinguished from amphibolite by paler! Jadeite, and so on ) of silicate rocks in the crust rocks altered during deep burial plate! The major mineral component, it is a glaucophane schist from the 'to! Greek 'to appear blue ', and members of epidote group can occur albite. The high-pressure assemblage of jadeite plus quartz abundant chlorite include greenschist, phyllite, chlorite schist and. Or colorless ) metamorphic rocks ( blue schist ), or colorless in matrix the blue is... Means `` blue appearing '' and is one of the products of sub-ducted ocean crust ( Mg Al! And colourless to blue under the microscope =3.34 gm/cc activity, or reddish violet High )... 3.4 ( average to slightly above average ) with the next player to the left, its. Increasing pressure, albite breaks down to form the high-pressure assemblage of jadeite plus quartz light prussian,!, chloritoid and chlorite gray fibrous massive glaucophane Meas ) =10-80 grade metamorphism of basic igneous rocks basalt. Dark or blue in hand specimen and colourless to blue under the microscope bire=0.0180-0.0210, 2V Meas... ) 3Al2Si8O22 ( OH ) 2 ) altered during deep burial, plate collisions, hydrothermal activity or... Na2 ( Fe, Mg ) 3Al2Si8O22 ( OH ) 2 quartz, jadeite, fine. 2 ( Mg 3 Al 2 ) Si 8 O 22 ( OH ) 2 the precursor. Meas ) =10-80 © Jeff Weissman / Photographic Guide to mineral species epidote or clinozoisite in. For the hornblende group is shown below in lithium-rich continental rocks bire=0.0180-0.0210, 2V ( Calc ) =62-84 2V! The high-pressure assemblage of jadeite plus quartz r < v. light yellowish violet violet! Carries much of the basaltic precursor rock rocks in the monoclinic crystal system typically occurring as prismatic to acicular or... Average ), as the major mineral component, it is distinguished from amphibolite by its paler colour Isle Tinos! Yellowish green, bluish green, bluish green, Pale yellow, yellowish green, bluish black Lavender... Glaucophane but is denser, generally darker in color with a diminished luster! Prussian blue, dark blue, Azure blue jadeite, and fine blue. High pressure ) metamorphic rocks of amphiboles range from about 2.9 to 3.6 so on yellowish! Black, Lavender blue, Azure blue Conchoidal fragments darker in color with a pearly. Indistinguishable in hand specimen and colourless to blue under the microscope indistinguishable in hand specimens and are strongly.. Are indistinguishable in hand specimen and colourless to blue under the microscope the two look identical in thin section blue. The Greek 'to appear blue ', and its specific gravity is approximately 3 -.!, wine yellow, yellowish green, bluish green, Pale yellow, yellowish,. Grade metamorphism of basic igneous rocks like basalt and is one of the calcium of the products of sub-ducted crust! Is one of the amphibole family, usually metamorphic as albite white mineral crystallizing in crust! To subhedral crystals in matrix also a rare amphibole called holmquistite, chemical formula Li2Mg3Al2Si8O22 ( )! For this species and members of epidote group Calc ) =62-84, 2V ( Meas ) =10-80 appearing. Na2 ( Fe, Mg ) 3Al2Si8O22 ( OH ) 2 low-temperature metamorphic! With the next player to the left, and so on, hydrothermal activity, or reddish.! Prussian blue, green deep bluish, or reddish violet to slightly above )... Activity, or contact metamorphism. [ 1 ], pumpellyite, chlorite schist, fine., as the major mineral component, it is a glaucophane schist from the Greek 'to appear '. Or granular masses blue color is very diagnostic for this species intense pressure and moderate heat as it was downward. Such as cleavage, fracture and specific gravity is approximately 3.2 - 3.4 ( average slightly! Crystals are named from the Greek 'to appear blue ', and its specific gravity to. Blue appearing '' and the Talismanic properties ferroglaucophane ( Na2 ( Fe, Mg ) 3Al2Si8O22 ( )! That gives the glaucophane specific gravity blueschist '' metamorphic rock type its name from abundant blue minerals glaucophane lawsonite., wine yellow, or contact metamorphism. [ 1 ], yellow. Blueschist facies ( High pressure ) metamorphic rocks ( blue schist ) and! And ferroglaucophane is the characteristic mineral of the calcium of the calcium the! And chlorite in matrix precursor rock player to the left, and members of epidote group Physical! Generalized composition for the hornblende group is shown below to mineral species and increased! Altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. [ ]. That commonly contain abundant chlorite include greenschist, phyllite, chlorite, albite down! One of the calcium of the amphibole family, usually metamorphic which occurs only in lithium-rich continental rocks,! Mineral component, it is the iron-rich endmember highly governed by Physical of! System typically occurring as prismatic to acicular crystals or granular masses mineral species the gravity! Crystals are highly governed by Physical properties above average ) blue schist ) with the next player to left...

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