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Definition of silica
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 silica is as below...
Silica
(n.)
Silicon
dioxide,
SiO/. It
constitutes
ordinary
quartz
(also opal and
tridymite),
and is
artifically
prepared
as a very fine,
white,
tasteless,
inodorous
powder..
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Vesuvianite
::
Vesuvianite
(n.) A
mineral
occurring
in
tetragonal
crystals,
and also
massive,
of a brown to green
color,
rarely
sulphur
yellow
and blue. It is a
silicate
of
alumina
and lime with some iron
magnesia,
and is
common
at
Vesuvius.
Also
called
idocrase..
Phlogopite
::
Phlogopite
(n.) A kind of mica
having
generally
a
peculiar
bronze-red
or
copperlike
color and a
pearly
luster.
It is a
silicate
of
aluminia,
with
magnesia,
potash,
and some
fluorine.
It is
characteristic
of
crystalline
limestone
or
dolomite
and
serpentine.
See
Mica..
Gismondite
::
Gismondite
(n.) A
native
hydrated
silicate
of
alumina,
lime, and
potash,
first
noticed
near
Rome..
Crocidolite
::
Crocidolite
(n.) A
mineral
occuring
in silky
fibers
of a
lavender
blue
color.
It is
related
to
hornblende
and is
essentially
a
silicate
of iron and soda; --
called
also blue
asbestus.
A
silicified
form, in which the
fibers
penetrating
quartz
are
changed
to oxide of iron, is the
yellow
brown
tiger-eye
of the
jewelers..
Quartz
::
Quartz
(n.) A form of
silica,
or
silicon
dioxide
(SiO2),
occurring
in
hexagonal
crystals,
which are
commonly
colorless
and
transparent,
but
sometimes
also
yellow,
brown,
purple,
green,
and of other
colors;
also in
cryptocrystalline
massive
forms
varying
in color and
degree
of
transparency,
being
sometimes
opaque..
Bronzite
::
Bronzite
(n.) A
variety
of
enstatite,
often
having
a
bronzelike
luster.
It is a
silicate
of
magnesia
and iron, of the
pyroxene
family..
Fayalite
::
Fayalite
(n.) A
black,
greenish,
or
brownish
mineral
of the
chrysolite
group.
It is a
silicate
of
iron..
Chondrodite
::
Chondrodite
(n.) A
fluosilicate
of
magnesia
and iron,
yellow
to red in
color,
often
occurring
in
granular
form in a
crystalline
limestone..
Leucite
::
Leucite
(n.) A
mineral
having
a
glassy
fracture,
occurring
in
translucent
trapezohedral
crystals.
It is a
silicate
of
alumina
and
potash.
It is found in the
volcanic
rocks of
Italy,
especially
at
Vesuvius..
Vermiculite
::
Vermiculite
(n.) A group of
minerals
having,
a
micaceous
structure.
They are
hydrous
silicates,
derived
generally
from the
alteration
of some kind of mica. So
called
because
the
scales,
when
heated,
open out into
wormlike
forms..
Danburite
::
Danburite
(n.) A
borosilicate
of lime, first found at
Danbury,
Conn. It is near the topaz in
form..
Silicic
::
Silicic
(a.)
Pertaining
to,
derived
from, or
resembling,
silica;
specifically,
designating
compounds
of
silicon;
as,
silicic
acid..
Cast Iron
::
Cast iron ()
Highly
carbonized
iron, the
direct
product
of the blast
furnace;
-- used for
making
castings,
and for
conversion
into
wrought
iron and
steel.
It can not be
welded
or
forged,
is
brittle,
and
sometimes
very hard.
Besides
carbon,
it
contains
sulphur,
phosphorus,
silica,
etc..
Atrium
::
Atrium
(n.) An open court with a porch or
gallery
around
three or more
sides;
especially
at the
entrance
of a
basilica
or other
church.
The name was
extended
in the
Middle
Ages to the open
churchyard
or
cemetery.
Silicified
::
Silicified
(a.)
Combined
or
impregnated
with
silicon
or
silica,
especially
the
latter;
as,
silicified
wood..
Knebelite
::
Knebelite
(n.) A
mineral
of a gray, red,
brown,
or green
color,
and
glistening
luster.
It is a
silicate
of iron and
manganese..
Yenite
::
Yenite
(n.) A
silicate
of iron and lime
occurring
in black
prismatic
crystals;
-- also
called
ilvaite.
Prehnite
::
Prehnite
(n.) A pale green
mineral
occurring
in
crystalline
aggregates
having
a
botryoidal
or
mammillary
structure,
and
rarely
in
distinct
crystals.
It is a
hydrous
silicate
of
alumina
and
lime..
Bole
::
Bole (n.) Any one of
several
varieties
of
friable
earthy
clay,
usually
colored
more or less
strongly
red by oxide of iron, and used to color and
adulterate
various
substances.
It was
formerly
used in
medicine.
It is
composed
essentially
of
hydrous
silicates
of
alumina,
or more
rarely
of
magnesia.
See Clay, and Terra
alba..
Clay
::
Clay (n.) A soft
earth,
which is
plastic,
or may be
molded
with the
hands,
consisting
of
hydrous
silicate
of
aluminium.
It is the
result
of the
wearing
down and
decomposition,
in part, of rocks
containing
aluminous
minerals,
as
granite.
Lime,
magnesia,
oxide of iron, and other
ingredients,
are often
present
as
impurities..
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