Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A mineral of sodium-aluminum or potassium-aluminum silicate, occurring worldwide in igneous rocks and used in the manufacture of ceramics and enamels.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A feldspathoid mineral of silica-poor igneous, plutonic and volcanic rocks. Chemically, nepheline is a plagioclase feldspar with insufficient silica to satisfy the chemical bonds. Because of the unfilled bonds, nepheline weathers rapidly and can only be seen as inclusions in freshly broken rock.

from the GNU version of the Collaborative International Dictionary of English

  • n. A mineral occuring at Vesuvius, in glassy hexagonal crystals; also elsewhere, in grayish or greenish masses having a greasy luster, as the variety elæolite. It is a silicate of aluminia, soda, and potash.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels

Etymologies

From Greek nephelē, cloud (because its fragments become cloudy when placed in nitric acid); see nebh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • Canadian feldspar nepheline syenite is sometimes used to lower bisk firing temperatures.

    European Lithographic | SciFi, Fantasy & Horror Collectibles

  • Kyrgyzstanabundant hydropower; significant deposits of gold and rare earth metals; locally exploitable coal, oil, and natural gas; other deposits of nepheline, mercury, bismuth, lead, and zinc

    Natural resources

  • Natural resources: abundant hydropower; significant deposits of gold and rare earth metals; locally exploitable coal, oil, and natural gas; other deposits of nepheline, mercury, bismuth, lead, and zinc

    Kyrgyzstan

  • High temperature (1100-1300°C) - primary flux: feldspar, nepheline syenite, fusible clay, wood ash.

    12. Developing glazes

  • Once a feldspar has been shown to you, you will easily recognize feldspars on your own. nepheline syenite: Nepheline syenite resembles feldspar but contains less quartz; so its melting point is lower, and it can be used as a body flux at temperatures above 1060° C. Rocks containing nepheline occur widely.

    Chapter 9

  • Commercial nepheline syenite has had its iron oxide removed by magnetic separation. glass powder: Ground glass is a cheap source of flux for both clay bodies and glazes.

    Chapter 9

  • Additional flux can be feldspar (preferably nepheline syenite), lime - stone, dolomite, frit or glass powder.

    Chapter 9

  • The flows from Kibo include nepheline and leucite basanite lavas rich in soda felspars.

    Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"

  • Natural resources: abundant hydroelectric potential; significant deposits of gold and rare earth metals; locally exploitable coal, oil and natural gas; other deposits of nepheline, mercury, bismuth, lead, and zinc

    The 1995 CIA World Factbook

  • Natural resources: abundant hydroelectric potential; significant deposits of gold and rare earth metals; locally exploitable coal, oil, and natural gas; other deposits of nepheline, mercury, bismuth, lead, and zinc

    The 1996 CIA Factbook

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