nepheline glass

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• Nepheline syenite — of the Intrusive Complex of Tanguá, State of Rio de Janeiro, Brasil (Motoki et al., 2011a) Nephelene syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar. The rocks are mostly pale colored, grey or… …   Wikipedia

• nepheline — [nef′əlīt΄nef′ə lēn΄, nef′əlin] n. [Fr néphéline < Gr nephelē, cloud (see NEBULA) + ine, INE1] a hard, light colored, hexagonal mineral, (Na,K)AlSiO4, used in making glass, china, etc.; sodium potassium aluminum silicate: sometimes called… …   English World dictionary

• nepheline syenite — Medium to coarse grained igneous rock, a member of the alkali syenite group, which consists largely of feldspar and nepheline. Nepheline syenite from Canada is used to replace feldspar in the manufacture of ceramic and glass products. * * * ▪… …   Universalium

• nepheline — /nef euh lin/, n. a feldspathoid mineral, essentially sodium aluminum silicate, NaAlSiO4, occurring in alkali rich volcanic rocks. Also, nephelite /nef euh luyt /. [1805 15; < F néphéline, equiv. to néphél ( < Gk nephéle cloud) + ine INE2] * * *… …   Universalium

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• feldspathoid — /feld spa thoyd , fel /, Mineral. adj. 1. Also, feldspathoidal. of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content. n. 2. a mineral of this group, as nepheline. [1895… …   Universalium

• Litchfieldite — is a rare metamorphosed igneous rock. It is a variety of nepheline syenite and is composed of two near pure phases of feldspar, albite and microcline, with predominance of the first one, plus nepheline, sodalite, cancrinite and calcite. The mafic …   Wikipedia

• Leucite — is a rock forming mineral composed of potassium and aluminium tectosilicate K [AlSi2O6] . Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they are not optically isotropic, and are therefore… …   Wikipedia

• Soft-paste porcelain — url= http://www.vam.ac.uk/images/image/38638 popup.html title= Porcelain plate work=Ceramics accessdate= 2007 12 06] Victoria and Albert Museum, London] Soft paste porcelain is a type of a ceramic material, but it lacks a more specific,… …   Wikipedia

• Optical mineralogy — A petrographic microscope, which is an optical microscope fitted with cross polarizing lenses, a conoscopic lens, and compensators (plates of anisotropic materials; gypsum plates and quartz wedges are common), for crystallographic analysis.… …   Wikipedia

• silica mineral — Any of the forms of silicon dioxide (SiO2), including quartz, tridymite, cristobalite, coesite, stishovite, melanophlogite, lechatelierite, and chalcedony. Various kinds of silica minerals have been produced synthetically. * * * Introduction… …   Universalium