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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...
- with <5%
normative quartz Nepheline syenite –
Holocrystalline plutonic rock – A silica-undersaturated
plutonic rock of
nepheline and
alkali feldspar Nephelinite –...
- Kishangarh, 14% of the po****tion is
under 6
years of age.
Kishangarh Nepheline Syenite is
among the 32
National Geological Monuments in
India notified...
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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...
- melt is produced,
forming a
nepheline syenite,
where orthoclase is
replaced by a
feldspathoid such as leucite,
nepheline or analcime.
Conversely in certain...
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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...
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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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syenite with
significant nepheline present can be
termed a
nepheline-bearing
syenite or
nepheline syenite, with the term
nepheline replaceable by any foid...
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igneous rock. It is a co****-grained,
foliated variety of
nepheline syenite,
sometimes called nepheline syenite gneiss or
gneissic nepeheline syenite. Litchfieldite...