glaucophane

/glaw"keuh fayn'/, n.
a sodium-rich monoclinic mineral of the amphibole family, usually metamorphic.
[1840-50; GLAUCO- + -PHANE]

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      common amphibole mineral, a sodium, magnesium, and aluminum silicate that occurs only in crystalline schists formed from sodium-rich rocks by low-grade metamorphism characteristic of subduction zones. Glaucophane typically occurs in folded rocks associated with blueschists. Both ferrous and ferric iron are replaced by magnesium and aluminum in the crystal structure to form riebeckite. For chemical formula and detailed physical properties, see amphibole (table).

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Universalium. 2010.

Look at other dictionaries:

  • Glaucophane — is a mineral belonging to the amphibole group, chemical formula Na2(Mg,Fe)3Al2Si8O22(OH)2. It is named from its typical blue color (in Greek, glaucophane means blue appearing ). Glaucophane crystallizes in the monoclinic system.The blue color is… …   Wikipedia

  • Glaucophane — Glaucophane[1] Catégorie IX : silicates[2] …   Wikipédia en Français

  • Glaucophane — Glau co*phane, n. [Gr. glayko s silvery, gray + fai nesqai to appear.] (Min.) A mineral of a dark bluish color, related to amphibole. It is characteristic of certain crystalline rocks. [1913 Webster] …   The Collaborative International Dictionary of English

  • glaucophane — ● glaucophane nom féminin Silicate naturel d aluminium, de fer, de magnésium et de sodium, du groupe des amphiboles, que l on trouve dans les roches métamorphiques de haute pression …   Encyclopédie Universelle

  • glaucophane — noun A mixed aluminate of sodium, magnesium and aluminium that has a characteristic blue colour, and exhibits pleochroism, with the chemical formula Na(Mg,Fe)AlSiO(OH) …   Wiktionary

  • glaucophane — glau·co·phane …   English syllables

  • glaucophane — ˈglȯkəˌfān noun ( s) Etymology: German glaukophan, from glauk glauc + phan phane : 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… …   Useful english dictionary

  • glaucophane schist facies — One of the major divisions of the mineral facies classification of metamorphic rocks, encompassing rocks whose peculiar mineralogy suggests that they formed under conditions of high pressure and relatively low temperature (generally less than… …   Universalium

  • glaucophane facies — ▪ geology       one of the major divisions of the mineral facies classification of metamorphic rocks, the rocks of which, because of their peculiar mineralogy, suggest formation conditions of high pressure and relatively low temperature; such… …   Universalium

  • metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

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