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Glaucophane information


Glaucophane
Bleu Gemm glaucophane with fuchsite
General
CategoryInosilicates
Sodic amphibole group
Formula
(repeating unit)
☐Na2(Mg3Al2)Si8O22(OH)2
IMA symbolGln[1]
Strunz classification9.DE.25
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Identification
ColorGray, navy blue, lavender-blue
Crystal habitslender long prisms, Massive granular to columnar
CleavageGood on [110] and on [001]
FractureBrittle – conchoidal
Mohs scale hardness6.0–6.5
LusterVitreous – pearly
StreakGrayish blue
DiaphaneityTranslucent
Specific gravity3–3.15
Optical propertiesBiaxial (−)
Refractive indexnα = 1.606 – 1.637 nβ = 1.615 – 1.650 nγ = 1.627 – 1.655
Birefringenceδ = 0.021
PleochroismStrong
DispersionStrong
References[2][3][4][5]

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.

Glaucophane crystallizes in the monoclinic system.

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ http://rruff.geo.arizona.edu/doclib/hom/glaucophane.pdf Handbook of Mineralogy
  3. ^ http://webmineral.com/data/Glaucophane.shtml Webmineral
  4. ^ "Glaucophane: Glaucophane mineral information and data". www.mindat.org.
  5. ^ Burke, Ernst A.J. "International Mineralogical Association - Commission on New Minerals, Nomenclature and Classification". pubsites.uws.edu.au. Archived from the original on 2015-01-05. Retrieved 2014-05-12.

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Glaucophane

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☐Na2(Mg3Al2)Si8O22(OH)2. Glaucophane crystallizes in the monoclinic system. Glaucophane is named for its typical blue color. In Greek, glaucophane means "blue appearing"...

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Blueschist

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Blueschist ( /ˈbluːʃɪst/), also called glaucophane schist, is a metavolcanic rock that forms by the metamorphism of basalt and rocks with similar composition...

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Amphibole

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detailed chemical analysis using an electron microprobe is required. Glaucophane to riebeckite form yet another solid solution series, which also extends...

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Cummingtonite

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compositional similarities with alkali amphiboles such as arfvedsonite, glaucophane-riebeckite. There is little solubility between these minerals due to...

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Diploschizia glaucophanes

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Diploschizia glaucophanes is a species of sedge moth in the genus Diploschizia. It was described by Edward Meyrick in 1922. It is found in South America...

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Tawhitia glaucophanes

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Tawhitia glaucophanes is a moth in the family Crambidae. It was described by Edward Meyrick in 1907. It is endemic to New Zealand, where it has been recorded...

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Eclogite

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mantle material. Group C are commonly found between layers of mica or glaucophane schist, primarily exemplified by the New Caledonia tectonic block off...

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Jadeite

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form zoisite and paragonite: Minerals associated with jadeite include: glaucophane, lawsonite, muscovite, aragonite, serpentine and quartz. Rocks that consist...

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Subduction zone metamorphism

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Albite = Glaucophane + Epidote + H2O Tremolite + Chlorite + Albite = Glaucophane + Lawsonite Pumpellyite + Chlorite + Albite = Glaucophane + Epidote...

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Neptunite

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pegmatite of West Greenland. It is also found within natrolite veins in glaucophane schist within serpentinite in San Benito County, California, US. It also...

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List of gemstones by species

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Malaia garnet Pyrope-spessartine Umbalite Gaspeite Gaylussite Gibbsite Glaucophane Goethite Goosecreekite Grandidierite Gypsum Gyrolite Halite Hambergite...

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Brittany

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schist and for the rich subsoil of the Groix island, which comprises glaucophane and epidote. During the Quaternary glaciations, Brittany was covered...

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Jade

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metamorphosed dolomitic limestones, and actinolite in metamorphic greenschists/glaucophane schists. Jadeite is a sodium- and aluminium-rich pyroxene. The more precious...

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Paragonite

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such as albite, jadeite and glaucophane. During the transition from blueschist to greenschist facies, paragonite and glaucophane are transformed into chlorite...

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List of minerals

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Gibbsite Gilalite Gismondine Glauberite Glaucochroite Glaucodot Glauconite Glaucophane Gmelinite Godovikovite Goethite Gold Goldmanite Gonnardite Gordaite Gormanite...

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Silicate mineral

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(Ca,Na) 2–3(Mg,Fe,Al) 5Si 6(Al,Si) 2O 22(OH) 2 Sodium amphibole group Glaucophane – Na2Mg3Al2Si8O22(OH)2 Riebeckite (asbestos) – Na2FeII3FeIII2Si8O22(OH)2...

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Metamorphic facies

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the blue minerals glaucophane and lawsonite. The blueschist facies forms the following mineral assemblages: In metabasites: glaucophane + lawsonite + chlorite...

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Benitoite

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In the San Benito occurrence, it is found in natrolite veins within glaucophane schist within a serpentinite body. In Japan, the mineral occurs in a...

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Lawsonite

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altered gabbro and diorite. Associate minerals include epidote, titanite, glaucophane, garnet and quartz. It is an uncommon constituent of eclogite. Its scarcity...

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Piemontite

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deposits of manganese ore. Associated minerals include: epidote, tremolite, glaucophane, orthoclase, quartz and calcite. Warr, L.N. (2021). "IMA–CNMNC approved...

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Metamorphism

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actinolite; cc = calcite; chl = chlorite; di = diopside; ep = epidote; glau = glaucophane; gt = garnet; hbl = hornblende; ky = kyanite; law = lawsonite; plag =...

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Little Panoche Creek

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County, California. The source of this creek is on the east slope of Glaucophane Ridge, of the Diablo Range in San Benito County. It flows east-northeast...

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Talc

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high-pressure, low-temperature minerals such as phengite, garnet, and glaucophane within the lower blueschist facies. Such rocks are typically white, friable...

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Groix

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More than 60 minerals can be found on the island, particularly blue glaucophane (observable on the surface), epidote or garnet.[citation needed] The...

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List of minerals by optical properties

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(isotropic) N/A N/A None Glauconite Monoclinic Biaxial (-) 0.032 Light blue Glaucophane Monoclinic Biaxial (-) 0.021 Pleochroic blue Microcline Triclinic Biaxial...

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Crossite

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riebeckite group. It is considered an intermediate between the amphiboles glaucophane and magnesioriebeckite, which form a series. IMA status: discredited...

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Zussmanite

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metamorphism, is characterized by the presence of glaucophane and forms glaucophane schists (Miyashiro 1973). Glaucophane schists, commonly referred to as blueschist-facies...

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Carbonatite

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halos consisting of sodium rich silicates arfvedsonite, barkevikite and glaucophane along with phosphates, hematite and other iron and titanium oxides. Overall...

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