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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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plutonic rock with <5%
normative quartz Nepheline-bearing diorite – Form of
intrusive igneous rock
Nepheline syenite –
Holocrystalline plutonic rock –...
- and
nepheline,
along with
accessories including biotite, magnetite,
ilmenite and analcime.
Theralite is the
intrusive equivalent of
nepheline basanite...
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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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Nepheline-bearing
gabbro is an
intrusive rock with a
composition intermediate between gabbro and
nepheline gabbro. It is
defined in the QAPF classification...
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syenite with
significant nepheline present can be
termed a
nepheline-bearing
syenite or
nepheline syenite, with the term
nepheline replaceable by any foid...
- 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)...
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alteration product of
corundum and
nepheline. It
occurs with kaolinite,
gibbsite and
diaspore in
bauxite deposits; and with
nepheline, gibbsite, diaspore, natrolite...
