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Leucite (from the Gr**** word
leukos meaning white) is a rock-forming
mineral of the
feldspathoid group, silica-undersaturated and
composed of pot****ium...
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Leucitite or
leucite rock is an
igneous rock
containing leucite. It is scarce, many
countries such as
England being entirely without them. However, they...
- olivine.
Unless potash is high and
silica relatively low,
leucite will not be present, for
leucite does not
occur with free quartz. Nepheline, likewise, is...
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Minerals typical of
lamproites include:
forsteritic olivine; high iron
leucite; titanium-rich aluminium-poor phlogopite; pot****ium- and titanium-rich...
- gl****-based
systems (mainly silica) with fillers,
usually crystalline (typically
leucite or, more recently,
lithium disilicate)
Composition category 3 – crystalline-based...
- is a
variation of the
igneous rock
trachyte that
contains nepheline or
leucite rather than quartz. It has an
unusually high (12% or more) Na2O + K2O content...
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evolves through trachybasalt or
leucite trachybasalt through tristanite or
leucite tristanite to pot****ic
trachyte or
leucite phonolite. The nephelinic, leucitic...
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porphyritic texture.
Mineral content is
usually abundant feldspathoids (
leucite or nepheline), plagioclase, and
lesser alkali feldspar.
Pyroxenes (clinopyroxenes)...
- The
mineral is not radioactive. Haüyne
occurs in
phonolites and
related leucite- or nepheline-rich, silica-poor,
igneous rocks; less
commonly in nepheline-free...
- Tusk is an
isolated remnant of a long
extinct volcano ****ociated with the
Leucite Hills to the east.
Heavily eroded, all that
remains of the
volcano is part...
