The word Mica is derived from the Latin word “micare”, which means “to shine”, in reference to its glittering effect when exposed to light. Mica is a non-metallic mineral that exhibits perfect basal cleavage. The mica group represents a total of 37 different types of mica. Muscovite and Phlogopite are important micas for commercial application. Muscovite is by far the most frequently mined and used type of mica. A typical chemical composition of Muscovite Mica is silica (SiO2) – 45%; alumina (Al2O3) – 38%; potassium oxide (K2O) – 12%; other – 5%.
Mica’s reflective optical properties are utilized in cosmetics as well as in paints & coatings. Besides it’s glittering and aesthetic effects, mica is used in a wide range of industrial applications. The construction and plastic industries use mica as a functional filler. Given its diverse properties and applications, mica is found in a significant number of parts and materials used in the automotive industry. Mica can withstand high temperature which makes it a useful component for welding and frictional systems. Mica is used as a lubricant in the oil & gas drilling sector.
|MICA TYPE||Composition formula||Characteristics|
|Muscovite||KAl2(AlSi3)O10(OH)2||Rude ore is a brownish natural platy mineral. Octahedral ions in a crystal are mostly occupied with Al.|
|Phlogopite||KMg3(AlSi3)O10(OH)2||Phologopite is darker than muscovite and soft. Octahedral ions in a crystal is mostly occupied with Mg.|
|Sericite||KAl2(AlSi3)O10(OH)2||Rude ore is a greenish gray, natural platy mineral, same composition as muscovite but its smaller crystals due to hydrometamorphism|
|Synthetic Fluoro Phlogopite||KMg3(AlSi3)O10F2||Synthetic fluorophlogopite, contains no (OH) of the natural phlogopite instead the (OH)- is fully substituted with F. White and a little rigid.|
|Physical property||Unit||Value referring to literature etc.|
|True specific gravity||kg/m3||(2.6～3.2)×103|
|Thermal conductivity (in direction perpendicular to a cleavage surface)||J/m・s・K||0.67|
|Dehydrating temperature of OH in crystal||℃||550|
|Ignition loss (900℃-3hr)||wt%||4～5|
|Dielectric breakdown voltage||kV/0.1mm||18～25|
|Relative permittivity (50Hz)||-||6.5～9|
|Dielectric loss tangent (50Hz, 25℃)||%||0.01～0.02|
|Coefficient of liner expansion||m/m・K||3.6×10-5|