Mica is a general term for mica minerals, which are aluminosilicates of metals such as potassium, aluminum, magnesium, iron, lithium, etc., all of which have layered structure and monoclinic crystal system. The crystals were pseudohexagonal or plate-like, occasionally columnar. The lamellar cleavage is very complete, glassy, and the flakes are elastic. The refractive index of mica increases with the increase of iron content, and can rise from low normal to medium normal. A colorless variety that does not contain iron. The higher the iron content, the darker the color, and the more polychromatic and absorptive.
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