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  • Nepheline Syenite The Canadian Encyclopedia

    Nepheline syenite is a white to light grey medium-grained igneous rock. It consists mostly of soda feldspar, nepheline and potash feldspar, accessory magnesium and iron-rich minerals. The Canadian nepheline syenite industry began in 1932 when claims were staked on Blue Mountain near Peterborough, Ontario, where it is still produced.

  • nepheline-syenite Encyclopedia

    nepheline-syenite A medium- to coarse-grained igneous rock consisting of essential alkali feldspar (see ESSENTIAL MINERAL), nepheline, pyroxene (aegirine-augite or sodic hedenbergite) and amphibole (ferrohastingsite, NaCa 2 (Fe 2+) 4 AlAl 2 Di 6 O 22 (OH) 2, which is essentially a sodic, iron-rich hornblende, barkevikite and/or arfvedsonite) with accessory sphene, apatite, titanomagnetite, ilmenite,

  • Nepheline Syenite 1911 Encyclopedia Britannica

    Or Elaeolite-Syenite, a holocrystalline plutonic rock which consists largely of nepheline and alkali felspar. The rocks are mostly pale coloured, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. They do not contain quartz, as that mineral and nepheline are mutually exclusive. From ordinary syenites they are distinguished not only by the

  • Nepheline syenite rock Britannica

    Nepheline syenite, medium- to coarse-grained intrusive igneous rock, a member of the alkali-syenite group ( see syenite) that consists largely of feldspar and nepheline. It is always considerably poorer in silica and richer in alkalies than granite.

  • Nepheline Syenite Encyclopedia

    Nepheline Syenite Encyclopedia. GEOGRAPHICAL NAMES: NEPHELINE SYENITE, or Elaeolite-Syenite, a holocrystalline plutonic rock which consists largely of nepheline and alkali felspar. The rocks are mostly pale coloured, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. They do not contain quartz, as that mineral and nepheline are

  • Nepheline Syenite 1911 Encyclopedia Britannica

    Or Elaeolite-Syenite, a holocrystalline plutonic rock which consists largely of nepheline and alkali felspar. The rocks are mostly pale coloured, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. They do not contain quartz, as that mineral and nepheline are mutually exclusive. From ordinary syenites they are distinguished not only by the presence of

  • Nepheline Syenite Encyclopedia

    Nepheline Syenite Encyclopedia. GEOGRAPHICAL NAMES: NEPHELINE SYENITE, or Elaeolite-Syenite, a holocrystalline plutonic rock which consists largely of nepheline and alkali felspar. The rocks are mostly pale coloured, grey or pink, and in general appearance they are not unlike granites, but dark green varieties are also known. They do not contain quartz, as that mineral and nepheline are

  • Nepheline syenite rock Britannica

    Nepheline syenite, medium- to coarse-grained intrusive igneous rock, a member of the alkali-syenite group ( see syenite) that consists largely of feldspar and nepheline. It is always considerably poorer in silica and richer in alkalies than granite.

  • Nepheline Encyclopedia

    nepheline An important member of the feldspathoid group of silicate minerals with composition Na 3 (Na,K)[Al 4 Si 4 O 16], which approximates to NaAlSiO 4 (with some K replacing Na); nepheline is an end-member of the series with kalsilite (KAlSiO 4); sp. gr. 2.56–2.66; hardness 5.5–6.0; hexagonal; colourless, grey, yellowish, brownish, reddish, or greenish; vitreous to greasy lustre; crystals normally

  • Nepheline 1911 Encyclopedia Britannica

    Nepheline Syenite a rock-forming mineral consisting of sodium, potassium and aluminium silicate, Na 6 K2A1 8 Si 9 0 34 Its crystals belong to the hexagonal system, and usually have the form of a short six-sided prism terminated by the basal plane.

  • Nepheline mineral Encyclopedia Britannica

    Nepheline is the characteristic mineral of alkaline plutonic rocks, particularly nepheline syenites and nepheline gneisses. It occurs in beautiful crystal form with mica, garnet, and sanidine feldspar on Monte Somma, Vesuvius, Italy. For detailed physical properties,

  • Nepheline Encyclopedia

    Nepheline Encyclopedia. GEOGRAPHICAL NAMES: NEPHELINE, a rock-forming mineral consisting of sodium, potassium and aluminium silicate, Na 6 K2A1 8 Si 9 0 34 Its crystals belong to the hexagonal system, and usually have the form of a short six-sided prism terminated by the basal plane. The unsymmetrical etched figures produced artificially on the prism faces indicate, however, that the

  • Nepheline (Kola Peninsula) : Encyclopedia Arctica 10

    NEPHELINE, a grey, clayey mineral chemically resembling feldspar, has been commercially developed chiefly on the Kola Peninsula (cf.) of the Soviet European Arctic, where virtually inexhaustible deposits (at least ten billion tons) have been found in preponderant admixture with apatite (cf.) as a result of a unique geological phenomenon. As it

  • Litchfieldite Wikipedia

    Litchfieldite is a rare igneous rock. It is a coarse-grained, foliated variety of nepheline syenite, sometimes called nepheline syenite gneiss or gneissic nepeheline syenite. Litchfieldite is composed of two varieties of feldspar, with nepheline, sodalite, cancrinite and calcite. The mafic minerals, when present, are magnetite and an iron-rich variety of biotite.

  • Feldspar and Syenites SpringerLink

    19.03.2014· Syenite is a group of plutonic (or intrusive) rocks being rich on feldspars. In comparison to granites they contain less/no quartz. Commercially apart from their use as dimensional stone nepheline syenite is the most important member of that group used in ceramics, glass, and polymers. In ceramics and glass it is used like feldspar as a source of alumina and as...

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