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Definition of alumina
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 alumina is as below...
Alumina
(n.) One of the
earths,
consisting
of two parts of
aluminium
and three of
oxygen,
Al2O3..
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Mesolite
::
Mesolite
(n.) A
zeolitic
mineral,
grayish
white or
yellowish,
occuring
in
delicate
groups
of
crystals,
also
fibrous
massive.
It is a
hydrous
silicate
of
alumina,
lime, and
soda..
Earth
::
Earth (n.) Any
earthy-looking
metallic
oxide,
as
alumina,
glucina,
zirconia,
yttria,
and
thoria..
Euclase
::
Euclase
(n.) A
brittle
gem
occurring
in light
green,
transparent
crystals,
affording
a
brilliant
clinodiagonal
cleavage.
It is a
silicate
of
alumina
and
glucina..
Ultramarine
::
Ultramarine
(n.) A blue
pigment
formerly
obtained
by
powdering
lapis
lazuli,
but now
produced
in large
quantities
by
fusing
together
silica,
alumina,
soda, and
sulphur,
thus
forming
a
glass,
colored
blue by the
sodium
polysulphides
made in the
fusion.
Also used
adjectively..
Edingtonite
::
Edingtonite
(n.) A
grayish
white
zeolitic
mineral,
in
tetragonal
crystals.
It is a
hydrous
silicate
of
alumina
and
baryta..
Turquois
::
Turquois
(n.) A
hydrous
phosphate
of
alumina
containing
a
little
copper;
calaite.
It has a blue, or
bluish
green,
color,
and
usually
occurs
in
reniform
masses
with a
botryoidal
surface..
Laumontite
::
Laumontite
(n.) A
mineral,
of a white color and
vitreous
luster.
It is a
hydrous
silicate
of
alumina
and lime.
Exposed
to the air, it loses
water,
becomes
opaque,
and
crumbles..
Harmotome
::
Harmotome
(n.) A
hydrous
silicate
of
alumina
and
baryta,
occurring
usually
in white
cruciform
crystals;
cross-stone..
Aluminate
::
Aluminate
(n.) A
compound
formed
from the
hydrate
of
aluminium
by the
substitution
of a metal for the
hydrogen.
Sodalite
::
Sodalite
(n.) A
mineral
of a white to blue or gray
color,
occuring
commonly
in
dodecahedrons,
also
massive.
It is a
silicate
of
alumina
and soda with some
chlorine..
Aluminous
::
Aluminous
(a.)
Pertaining
to or
containing
alum, or
alumina;
as,
aluminous
minerals,
aluminous
solution..
Topaz
::
Topaz (n.) A
mineral
occurring
in
rhombic
prisms,
generally
yellowish
and
pellucid,
also
colorless,
and of
greenesh,
bluish,
or
brownish
shades.
It
sometimes
occurs
massive
and
opaque.
It is a
fluosilicate
of
alumina,
and is used as a gem..
Eosphorite
::
Eosphorite
(n.) A
hydrous
phosphate
of
alumina
and
manganese.
It is
generally
of a
rose-pink
color,
--
whence
the
name..
Alumine
::
Alumine
(n.)
Alumina.
Websterite
::
Websterite
(n.) A
hydrous
sulphate
of
alumina
occurring
in white
reniform
masses.
Stilt
::
Stilpnomelane
(n.) A black or
greenish
black
mineral
occurring
in
foliated
flates,
also in
velvety
bronze-colored
incrustations.
It is a
hydrous
silicate
of iron and
alumina..
Lazulite
::
Lazulite
(n.) A
mineral
of a light
indigo-blue
color,
occurring
in small
masses,
or in
monoclinic
crystals;
blue spar. It is a
hydrous
phosphate
of
alumina
and
magnesia..
Spinel
::
Spinelle
(n.) A
mineral
occuring
in
octahedrons
of great
hardness
and
various
colors,
as red,
green,
blue,
brown,
and
black,
the red
variety
being the gem
spinel
ruby. It
consist
essentially
of
alumina
and
magnesia,
but
commonly
contains
iron and
sometimes
also
chromium..
Zunyite
::
Zunyite
(n.) A
fluosilicate
of
alumina
occurring
in
tetrahedral
crystals
at the Zu/i mine in
Colorado.
Natrolite
::
Natrolite
(n.) A
zeolite
occuring
in
groups
of
glassy
acicular
crystals,
and in
masses
which often have a
radiated
structure.
It is a
hydrous
silicate
of
alumina
and
soda..
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