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Definition of feldspar
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of feldspar is as below...
Feldspar
(n.) Alt. of
Feldspat.
Lern More About Feldspar
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Orthoclase
::
Orthoclase
(n.)
Common
or
potash
feldspar
crystallizing
in the
monoclinic
system
and
having
two
cleavages
at right
angles
to each
other.
See
Feldspar.
Diabase
::
Diabase
(n.) A
basic,
dark-colored,
holocrystalline,
igneous
rock,
consisting
essentially
of a
triclinic
feldspar
and
pyroxene
with
magnetic
iron; -- often
limited
to rocks
pretertiary
in age. It
includes
part of what was early
called
greenstone..
Aphanite
::
Aphanite
(n.) A very
compact,
dark-colored
/ock,
consisting
of
hornblende,
or
pyroxene,
and
feldspar,
but
neither
of them in
perceptible
grains..
Sunstroke
::
Sunstone
(n.)
Aventurine
feldspar.
See under
Aventurine.
Oligoclase
::
Oligoclase
(n.) A
triclinic
soda-lime
feldspar.
See
Feldspar.
Diorite
::
Diorite
(n.) An
igneous,
crystalline
in
structure,
consisting
essentially
of a
triclinic
feldspar
and
hornblende.
It
includes
part of what was
called
greenstone..
Adularia
::
Adularia
(n.) A
transparent
or
translucent
variety
of
common
feldspar,
or
orthoclase,
which often shows
pearly
opalescent
reflections;
--
called
by
lapidaries
moonstone..
Felsite
::
Felsite
(n.) A
finegrained
rock,
flintlike
in
fracture,
consisting
essentially
of
orthoclase
feldspar
with
occasional
grains
of
quartz..
Gtraystone
::
Gtraystone
(n.) A
grayish
or
greenish
compact
rock,
composed
of
feldspar
and
augite,
and
allied
to
basalt..
Basalt
::
Basalt
(n.) A rock of
igneous
origin,
consisting
of
augite
and
triclinic
feldspar,
with
grains
of
magnetic
or
titanic
iron, and also
bottle-green
particles
of
olivine
frequently
disseminated..
Sanidine
::
Sanidine
(n.) A
variety
of
orthoclase
feldspar
common
in
certain
eruptive
rocks,
as
trachyte;
--
called
also
glassy
feldspar..
Porphyry
::
Porphyry
(n.) A term used
somewhat
loosely
to
designate
a rock
consisting
of a
fine-grained
base
(usually
feldspathic)
through
which
crystals,
as of
feldspar
or
quartz,
are
disseminated.
There are red,
purple,
and green
varieties,
which are
highly
esteemed
as
marbles..
Trachyte
::
Trachyte
(n.) An
igneous
rock,
usually
light gray in color and
breaking
with a rough
surface.
It
consists
chiefly
of
orthoclase
feldspar
with
sometimes
hornblende
and
mica..
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..
Microcline
::
Microcline
(n.) A
mineral
of the
feldspar
group,
like
orthoclase
or
common
feldspar
in
composition,
but
triclinic
in
form..
Moonstone
::
Moonstone
(n.) A
nearly
pellucid
variety
of
feldspar,
showing
pearly
or
opaline
reflections
from
within.
It is used as a gem. The best
specimens
come from
Ceylon..
Anorthite
::
Anorthite
(n.) A
mineral
of the
feldspar
family,
commonly
occurring
in small
glassy
crystals,
also a
constituent
of some
igneous
rocks.
It is a lime
feldspar.
See
Feldspar..
Dolerite
::
Dolerite
(n.) A
dark-colored,
basic,
igneous
rock,
composed
essentially
of
pyroxene
and a
triclinic
feldspar
with
magnetic
iron. By many
authors
it is
considered
equivalent
to a
coarse-grained
basalt..
Saussurite
::
Saussurite
(n.) A
tough,
compact
mineral,
of a
white,
greenish,
or
grayish
color.
It is near
zoisite
in
composition,
and in part, at
least,
has been
produced
by the
alteration
of
feldspar..
Schist
::
Schist
(n.) Any
crystalline
rock
having
a
foliated
structure
(see
Foliation)
and hence
admitting
of ready
division
into slabs or
slates.
The
common
kinds are mica
schist,
and
hornblendic
schist,
consisting
chiefly
of
quartz
with mica or
hornblende
and often
feldspar..
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