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Feldspar
Feldspar Feld"spar`, Feldspath Feld"spath`, n. [G.
feldspath; feld field + spath spar.] (Min.)
A name given to a group of minerals, closely related in
crystalline form, and all silicates of alumina with either
potash, soda, lime, or, in one case, baryta. They occur in
crystals and crystalline masses, vitreous in luster, and
breaking rather easily in two directions at right angles to
each other, or nearly so. The colors are usually white or
nearly white, flesh-red, bluish, or greenish.
Note: The group includes the monoclinic (orthoclastic)
species orthoclase or common potash feldspar, and the
rare hyalophane or baryta feldspar; also the triclinic
species (called in general plagioclase) microcline,
like orthoclase a potash feldspar; anorthite or lime
feldspar; albite or soda feldspar; also intermediate
between the last two species, labradorite, andesine,
oligoclase, containing both lime and soda in varying
amounts. The feldspars are essential constituents of
nearly all crystalline rocks, as granite, gneiss, mica,
slate, most kinds of basalt and trachyte, etc. The
decomposition of feldspar has yielded a large part of
the clay of the soil, also the mineral kaolin, an
essential material in the making of fine pottery.
Common feldspar is itself largely used for the same
purpose.
Meaning of Feldspar from wikipedia
-
common members of the
feldspar group are the
plagioclase (sodium-calcium)
feldspars and the
alkali (pot****ium-sodium)
feldspars.
Feldspars make up
about 60%...
-
Feldspar is a
group of rock-forming minerals, including:
Alkali feldspar Alkali feldspar granite Pot****ium
feldspar Feldspar may also
refer to: A community...
- Pot****ium
feldspar refers to a
number of
minerals in the
feldspar group that
contain large amounts of pot****ium in the
crystal lattice.
Orthoclase (endmember...
- is a
series of
tectosilicate (framework silicate)
minerals within the
feldspar group.
Rather than
referring to a
particular mineral with a
specific chemical...
- Orthoclase, or
orthoclase feldspar (endmember
formula KAlSi3O8), is an
important tectosilicate mineral which forms igneous rock. The name is from the Ancient...
- (phaneritic)
intrusive igneous rock
composed mostly of quartz,
alkali feldspar, and plagioclase. It
forms from
magma with a high
content of
silica and...
-
Alkali feldspar granite, some
varieties of
which are
called 'red granite', is a
felsic igneous rock and a type of
granite rich in the
mineral pot****ium...
- USS
Feldspar (IX-159), a Trefoil-class
concrete barge designated an
unclassified miscellaneous vessel, was the only ship of the
United States Navy to be...
- 20–25% of all
sedimentary rocks. Most
sandstone is
composed of
quartz or
feldspar,
because they are the most
resistant minerals to the
weathering processes...
-
Moonstone is a
sodium pot****ium
aluminium silicate ((Na,K)AlSi3O8) of the
feldspar group that
displays a
pearly and
opalescent schiller. An
alternative name...
