Mica

Mica is a common rock forming mineral and is found in igneous, metamorphic and detrital sedimentary rocks.
Physical Characteristics" Colors is white, silver, yellow, green and brown" Luster is vitreous to pearly " Transparency crystals are transparent to translucent " Hardness is 2-2.5" Specific Gravity is approximately 2.8 (average)
Mica is layer silicate mineral contains many element such as potassium, magnesium, aluminum,iron.The formula for mica is kal2(alsi 3 o 10 )(ohf) 2.
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.
It acts as a filler and extender, provides a smoother consistency, improves workability, and prevents cracking.
In the paint industry,used as a pigment extender 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.
Used in the well-drilling industry as an additive to drilling “muds.”
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.
The major uses of sheet and block mica are as electrical insulators in electronic