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Nepheline, also
called nephelite (from
Ancient Gr**** νεφέλη (nephélē) 'cloud'), is a rock-forming
mineral in the
feldspathoid group – a silica-undersaturated...
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Nepheline syenite is a
holocrystalline plutonic rock that
consists largely of
nepheline and
alkali feldspar. The
rocks are
mostly pale colored, grey or...
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Nepheline-bearing
gabbro is an
intrusive rock with a
composition intermediate between gabbro and
nepheline gabbro. It is
defined in the QAPF classification...
- with <5%
normative quartz Nepheline syenite –
Holocrystalline plutonic rock – A silica-undersaturated
plutonic rock of
nepheline and
alkali feldspar Nephelinite –...
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valuable minerals are
calcium carbonate (limestone),
building stone,
nepheline syenite, olivine, iron, titanium, and nickel. In 2017, the Government...
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surface exposures of the
Beemerville Alkaline Complex consist of two
large nepheline syenite plutons; a
nearby diatreme (Rutan Hill); and
several other nearby...
- Greenland, the
Illimaussaq alkaline complex consists of
pegmatites such as
nepheline,
syenites (especially
kakortokite or naujaite) and
sodalite (sodalite-foya)...
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Nepheline-bearing
diorite is an
intrusive rock with a
composition intermediate between diorite and
nepheline diorite. It is
defined in the QAPF classification...
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produce feldspars. In some cases, they may take
other forms, such as
nepheline, leucite, and muscovite, but in the
great majority of
instances they are...
- with peristherite;
oriented optical axis in
nephelines;
Proposed origin:
metamorphism of
igneous nepheline syenite Localization: Rio de
Janeiro State Age...
