Definition of rath
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Lern More About Rath
Feldspath ::
Feldspath (n.) 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..
Gneiss ::
Gneiss (n.) A
crystalline rock,
consisting, like
granite, of
quartz, feldspar, and mica, but
having these
materials, especially the mica,
arranged in
planes, so that it
breaks rather easily into
coarse slabs or
flags. Hornblende sometimes takes the place of the mica, and it is then
called hornblendic /
syenitic gneiss. Similar varieties of
related rocks are also
called gneiss..