micaceousmicasMica grouptrioctahedral mica mica capitalbrittle micaCrude Micagreen micaceousLargest Mica producermica minerals
The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage.wikipedia
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Cleavage (crystal)

cleavagecleavagescleavage plane
The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage.


biotite micabiotite gneissbiotite orbicules
Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula.


mineralsmineral depositsaccessory mineral
The mica group of sheet silicate (phyllosilicate) minerals includes several closely related materials having nearly perfect basal cleavage.
The major examples of these are quartz, the feldspars, the micas, the amphiboles, the pyroxenes, the olivines, and calcite; except for the last one, all of these minerals are silicates.


fluorphlogopite micatetraferriphlogopite
The largest documented single crystal of mica (phlogopite) was found in Lacey Mine, Ontario, Canada; it measured 10 × and weighed about 330 tonne.
Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates.


polylithioniterose-coloured micatrilithionite
Lepidolite is a lilac-gray or rose-colored member of the mica group of minerals with formula K(Li,Al,Rb) 2 (Al,Si) 4 O 10 (F,OH) 2.


Phengite is a series name for dioctahedral micas of composition K(AlMg) 2 (OH) 2 (SiAl) 4 O 10 it is common for Mg or Fe2+ to substitute for Al on the Y site and a corresponding increase in Si on the Z site in the mica group formula X 2 Y 4–6 Z 8 O 20 (OH, F) 4.


* Clintonite
It is a member of the margarite group of micas and the subgroup often referred to as the "brittle" micas.


pegmatitespegmatiticpegmatitic veins
Large crystals of mica used for various applications are typically mined from granitic pegmatites.
Most pegmatites are composed of quartz, feldspar and mica, having a similar silicic composition as granite.

Sedimentary rock

sedimentarysedimentary rockssediments
Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes.
Clastic rocks are composed largely of quartz, feldspar, rock (lithic) fragments, clay minerals, and mica; any type of mineral may be present, but they in general represent the minerals that exist locally.


schistsmica schistschistose
Flake mica comes from several sources: the metamorphic rock called schist as a byproduct of processing feldspar and kaolin resources, from placer deposits, and from pegmatites.
These lamellar (flat, planar) minerals include micas, chlorite, talc, hornblende, graphite, and others.


Zinnwaldite, KLiFeAl(AlSi 3 )O 10 (OH,F) 2, potassium lithium iron aluminium silicate hydroxide fluoride is a silicate mineral in the mica group.

Metamorphic rock

metamorphicmetamorphosedmetamorphic rocks
Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes.
Other minerals, such as olivines, pyroxenes, amphiboles, micas, feldspars, and quartz, may be found in metamorphic rocks, but are not necessarily the result of the process of metamorphism.

Eye shadow

eyeshadoweye shadowseyeshadow palette
In the cosmetics industry, its reflective and refractive properties make mica an important ingredient in blushes, eye liner, eye shadow, foundation, hair and body glitter, lipstick, lip gloss, mascara, moisturizing lotions, and nail polish.
It is usually made from a powder and mica, but can also be found in liquid, pencil, cream or mousse form.

Igneous rock

igneousigneous rocksdecompression melting
Mica is widely distributed and occurs in igneous, metamorphic and sedimentary regimes.
Feldspars, quartz or feldspathoids, olivines, pyroxenes, amphiboles, and micas are all important minerals in the formation of almost all igneous rocks, and they are basic to the classification of these rocks.

Foliation (geology)

The crystalline structure of mica forms layers that can be split or delaminated into thin sheets usually causing foliation in rocks.
Foliation may be formed by realignment of micas and clays via physical rotation of the minerals within the rock.


isinglassFuchsitemuscovite mica
* Muscovite
Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock or as a secondary mineral resulting from the alteration of topaz, feldspar, kyanite, etc.


graphiticblack leadplumbago
Greases used for axles are composed of a compound of fatty oils to which mica, tar or graphite is added to increase the durability of the grease and give it a better surface.
Minerals associated with graphite include quartz, calcite, micas and tourmaline.


Jharkhand StateJharkhand movementJarkhand
The British Geological Survey reported that as of 2005, Koderma district in Jharkhand state in India had the largest deposits of mica in the world.
Jharkhand also has immense mineral resources: minerals ranging from (ranking in the country within bracket) from iron ore (1st), coal(3rd), copper ore (1st), mica (1st), bauxite (3rd), Manganese, limestone, china clay, fire clay, graphite (8th), kainite (1st), chromite (2nd), asbestos (1st), thorium (3rd), sillimanite, uranium (Jaduguda mines, Narwa Pahar) (1st) and even gold (Rakha Mines) (6th) and silver and several other minerals.


Only high-quality muscovite film mica, which is variously called India ruby mica or ruby muscovite mica, is used as a dielectric in capacitors.
Materials commonly used as dielectrics include glass, ceramic, plastic film, paper, mica, air, and oxide layers.


Sisilicon revolutionsilicium
Layer silicates, such as the clay minerals and the micas, are very common, and often are formed by horizontal cross-linking of metasilicate chains or planar condensation of smaller units.


wave platequarter-wave platehalf-wave plate
Mica is birefringent and is therefore commonly used to make quarter and half wave plates.
Waveplates are constructed out of a birefringent material (such as quartz or mica, or even plastic), for which the index of refraction is different for light linearly polarized along one or the other of two certain perpendicular crystal axes.

Titanium dioxide

TiO 2 titaniatitanium white
Many metallic-looking pigments are composed of a substrate of mica coated with another mineral, usually titanium dioxide (TiO 2 ).
Some grades of modified titanium based pigments as used in sparkly paints, plastics, finishes and cosmetics - these are man-made pigments whose particles have two or more layers of various oxides – often titanium dioxide, iron oxide or alumina – in order to have glittering, iridescent and or pearlescent effects similar to crushed mica or guanine-based products.


Small squared pieces of sheet mica are also used in the traditional Japanese Kodo ceremony to burn incense: A burning piece of coal is placed inside a cone made of white ash.
In kōdō, a small piece of fragrant wood is heated on a small Mica plate (Gin-yo), which is heated from below by a piece of charcoal that is surrounded by ash.


asbestos fibersblue asbestosamphibole asbestos
Dry-ground phlogopite mica is used in automotive brake linings and clutch plates to reduce noise and vibration (asbestos substitute); as sound-absorbing insulation for coatings and polymer systems; in reinforcing additives for polymers to increase strength and stiffness and to improve stability to heat, chemicals, and ultraviolet (UV) radiation; in heat shields and temperature insulation; in industrial coating additive to decrease the permeability of moisture and hydrocarbons; and in polar polymer formulations to increase the strength of epoxies, nylons, and polyesters.
Vermiculite is a hydrated laminar magnesium-aluminum-iron silicate which resembles mica.

Commutator (electric)

Flexible plate is used in electric motor and generator armatures, field coil insulation, and magnet and commutator core insulation.
Mica was used on early machines and is still used on large machines.