-
Nepheline, also
called nephelite (from
Ancient Gr**** νεφέλη (nephélē) 'cloud'), is a rock-forming
mineral in the
feldspathoid group – a silica-undersaturated...
-
Nepheline syenite is a
holocrystalline plutonic rock that
consists largely of
nepheline and
alkali feldspar. The
rocks are
mostly pale colored, grey or...
-
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 –...
- with peristherite;
oriented optical axis in
nephelines;
Proposed origin:
metamorphism of
igneous nepheline syenite Localization: Rio de
Janeiro State Age...
- Greenland, the
Illimaussaq alkaline complex consists of
pegmatites such as
nepheline,
syenites (especially
kakortokite or naujaite) and
sodalite (sodalite-foya)...
-
valuable minerals are
calcium carbonate (limestone),
building stone,
nepheline syenite, olivine, iron, titanium, and nickel. In 2017, the Government...
-
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...
-
Nepheline-bearing
diorite is an
intrusive rock with a
composition intermediate between diorite and
nepheline diorite. It is
defined in the QAPF classification...
-
Ijolite is an
igneous rock
consisting essentially of
nepheline and augite.
Ijolite is a rare rock type of
considerable importance from a mineralogical...