What is Mica?
Mica: Micas commonly occur as flakes, books, or sheets. Sheet muscovite
(white) mica is used in electronic insulators (mainly in vacuum tubes),
ground mica in paint, as joint cement, as a dusting agent, in well-drilling
muds, and in plastics, roofing, rubber, and welding rods.
Mica History & General Information
The name mica was probably created from the Latin word micare meaning to shine in reference to the shiny luster of the micas. Muscovite is very resistant to heat and electricity. As a result, it was commonly called "Muscovy." This mineral was commonly called Muscovy Glass after the Latin term vitrum Muscoviticum. In 1850, James Dwight Dana formally named this mineral muscovite based on the Latin term. The name phlogopite, named by F.A. Breithaupt in 1841, comes from the Greek word phologopos meaning fiery in reference to the reddish color seen on some specimens of this mica.
Mica is a mineral name given to a group of minerals that are similar in their physical properties and chemical compositions. They are all silicate minerals, which means that chemically they all contain silica (SiO4). Mineralogists call micas sheet silicates because their molecules combine to form distinct layers. These layers can be seen in muscovite mica specimens because it can be split (mineralogists call this feature cleavage) into very thin, flexible, transparent layers. This physical property is so distinctive that all minerals that cleave in this fashion are said to have micaceous cleavage.
There are 37 different mica minerals. In addition to the silicate tetrahedrons in all micas, purple micaceous cleavage.
contains the elements potassium, lithium, and aluminum. Black biotite contains potassium, iron, and magnesium. The two micas used as a commodity are: brown mica or phlogopite which contains iron and magnesium; and the "reddish, green, or white (or clear) mica" or muscovite which contains potassium and aluminum.
<=A typical mica crystal.
Large sheets of muscovite form in igneous rocks. Very large sheets or
crystals of muscovite form in a pegmatite. A pegmatite is an extremely
slow-cooling igneous rock in which very large crystals can form. Phlogopite
generally forms in metamorphic rocks, especially in metamorphosed limestone,
although it occasionally forms in igneous rocks, too.
Mica crystals are six-sided. They are fairly light and relatively soft, at 2
to 4 on Mohs' hardness scale for the univalent micas. Sheets and flakes of
mica are flexible. Mica is heat-resistant and does not conduct electricity.
Two distinct forms of mica are utilized as a commodity. Scrap and flake mica is
mica that either occurs naturally or is ground into very small flakes and
pieces. Sheet mica is large pieces of mica that can be cut into various shapes
for use in electronics.
Mica Sources
Scrap and flake mica is produced all
over the world. The flake mica produced
in Iran comes from several sources: the
metamorphic rock called schist as a
by-product of processing feldspar and
kaolin resources, from placer deposits, and from pegmatites.
Sheet mica is considerably less abundant
than flake and scrap mica. Sheet mica is
occasionally recovered from mining scrap
and flake mica. The most important
sources of sheet mica are the pegmatite deposits.
Mica Uses
The principal use of ground mica is in gypsum wallboard joint compound,
where it acts as filler and extender, provides a smoother consistency,
improves workability, and prevents cracking. In the paint industry, ground
mica is used as a pigment extender that
also facilitates suspension due to its
light weight and platy morphology. The
ground mica also reduces checking and
chalking, prevents shrinkage and shearing of the paint film, provides
increased resistance to water penetration and weathering, and
brightens the tone of colored pigments.
Ground mica also is used in the well-drilling industry as an additive to
drilling “muds.”
Coarsely ground mica flakes help prevent
lost circulation by sealing porous
sections of the uncased drill hole. The
plastic industry used ground mica as an
extender and filler and also as a reinforcing agent. The rubber industry
uses ground mica as an inert filler and
as a mold lubricant in the manufacture
of molded rubber products, including tires.
Sheet mica is used principally in the
electronic and electrical industries.
The major uses of sheet and block mica
are as electrical insulators in
electronic equipment, thermal
insulation, gauge “glass”, windows in
stove and kerosene heaters, dielectrics
in capacitors, decorative panels in
lamps and windows, insulation in
electric motors and generator armatures,
field coil insulation, and magnet and
commutator core insulation. Mica is also
used as segment plates between copper
commutator sections to insulate copper
from the steel; phlogopite mica is used
because it wears at the same rate as the copper segments.
Substitutes and Alternative Sources
Some lightweight mineral and rock
materials, such as vermiculite,
diatomite and perlite are similar to
micas and can be used in place of mica.
A long list of manufactured materials,
such as styrene, polyester, Teflon,
Plexiglas, etc., can be used in place of
sheet mica in the electronic
applications. Paper made from ground
mica can be used in place of sheet mica
for insulating applications.
Recommended Filled of Application
Kind of powder |
Talc |
Mica |
Kaolin |
Red Iron oxide |
Fluorine |
Dolomite |
Calcite |
Bentonite |
Barite |
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