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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 –...
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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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Nepheline-bearing
gabbro is an
intrusive rock with a
composition intermediate between gabbro and
nepheline gabbro. It is
defined in the QAPF classification...
- and
nepheline,
along with
accessories including biotite, magnetite,
ilmenite and analcime.
Theralite is the
intrusive equivalent of
nepheline basanite...
- Es****ite ( /ˈɛsəkˌsaɪt/), also
called nepheline monzogabbro (/ˈnɛfəˌlɪn ˌmɒnzoʊˈɡæbroʊ, -ˌliːn-/), is a dark gray or
black holocrystalline plutonic igneous...
- 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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Ijolite is an
igneous rock
consisting essentially of
nepheline and augite.
Ijolite is a rare rock type of
considerable importance from a mineralogical...
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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...
