Mica, a collection of potassium and aluminum containing Silicate mineral. It is a layered silicate with a one-dimensional sheet-like or layered structure. Among the most important rock forming minerals, mica is located in all three of the most important rock types - Igneous rock, Sedimentary rock and Metamorphic rock.

Classification of Mica Group Minerals

Chemically, mica can provide a general formula
X2Y4-6 Z8O20 (OH, F) 4
X is K, Na, or Ca, or less commonly Ba, Rb, or Cs;
Y is Al, Mg, Fe or less common Mn, Cr, Ti, Li, etc;
Z is mainly Si or Al, but may also include Fe3+or Ti.

In structure, mineral mica can be divided into double Octahedron (Y=4) and trioctahedron (Y=6). If the X ion is K or Na, then mica is ordinary mica, and if the X ion is Ca, then mica is brittle mica.

The occurrence state of mica group minerals

Mica may also be the result of different surgeries in several specific situations. Their genesis is listed below, including crystallization of consolidated magma, fluid deposition generated by magmatic movement or directly related to magmatic movement, fluid deposition circulating at a certain point of contact and nearby Metamorphism, and formation due to alteration technology (even possibly caused by Weathering), including feldspar and other minerals. The equilibrium range of mica has been studied in the laboratory, and in some institutions, their presence (rather than non-existent) or certain issues with their chemical composition may additionally serve as thermometers or pressure gauges.

production

Fragmented mica and flake mica are produced worldwide. In 2010, the main production countries were Russia (100000 tons), Finland (68000 tons), the United States (53000 tons), South Korea (50000 tons), France (20000 tons), and Canada (15000 tons), with a global total production of 350000 tons, but China does not have reliable data. Most flake mica is produced in India (3500 tons) and Russia (1500 tons). There are several sources of schistose mica: Metamorphic rock schist, placer and Pegmatite produced during the processing of feldspar and kaolin resources. The content of schistose mica is much lower than that of schistose mica and broken mica, and can occasionally be recovered from mining broken mica and broken mica. The most important source of schistose is Pegmatite deposit. The price of mica sheets varies depending on the grade, ranging from less than $1 per kilogram for low-quality mica to over $2000 per kilogram for highest quality mica.