nepheline in English

noun
1
a colorless, greenish, or brownish mineral consisting of an aluminosilicate of sodium (often with potassium) and occurring as crystals and grains in igneous rocks.
All basalt chemical compositions can be plotted in the basalt tetrahedron, which has normative quartz, olivine, nepheline and augite at the apices.

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1. Historically it was mined from deposits associated with dunites in North Carolina, US and from a nepheline syenite in Craigmont, Ontario.

2. The mineral is one especially liable to alteration, and in the laboratory various substitution products of nepheline have been prepared.

3. Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.

4. 18 Wadeite is paragenic with aegirine, nepheline, arfredsonite, microcline and apatite, and associated with natrolite, rinkite and cancrinite.

5. Basalts, basalt series, and basalt classification Basalt in the generic sense = plagioclase + clinopyroxene +/- (olivine, nepheline, hypersthene, quartz, melilite, magnetite)

6. The latter two are dark green minerals, which occur as original constituents of igneous rocks rich in sodium, such as nepheline-syenite and phonolite.

7. Biotites are associated with nepheline, pyroxene (ti-tan-augite), zeolite (primarily phillipsite and thom-sonite), and, more rarely, apatite and carbonate

8. Alkali feldspar, apatite, clinopyroxene, olivine, magnetite, mica, nepheline, oxides, plagioclase, quartz, sodalite, titanite and zircon also form the groundmass of microliths in erupted rocks.

9. Whereas most of the complex consists of salic rocks (syenites, nepheline syenites and alkali granites) a spectrum of intermediate rock types (monzonites, monzodiorites and alkali diorites) grades to alkali gabbros.

10. Lacroix (1922) described garnet occurrences in Madagascar, especially Andradite in igneous rocks, and reported the discovery of some crystals of pale green Andradite lining cavities in a nepheline-bearing syenite at Mount Bezavona.

11. An important determinative character of nepheline is the ease with which it is decomposed by hydrochloric acid, with separation of gelatinous silica (which may be readily stained by coloring matters) and cubes of salt.

12. The formation of alunite from natural leucite, nepheline, sodalite, potassium-feldspar, oligoclase and sericite as well as from basaltic-glass, trachyandesite, nephelinebasanite and nephelinite was experimentally investigated at different H2SO4-concentrations in the temperature range from 90° to 180° C.

13. The Kipawa Syenite Complex, a thin, folded sheet of amphibole syenite, quartz syenite and minor nepheline syenite, lies along a west-vergent thrust separating a lower slice comprising the Kikwissi granodiorite and biotite tonalite dated at 2717 +15–11 Ma, and unconformably overlying metasedimentary rocks from an overlying slice containing the Red Pine Chute orthogneiss, an alkali granite gneiss, and the Mattawa Quartzite.