Is mica a rock-forming mineral?
Mica is a rock-forming mineral, which is a general term for layered structure aluminosilicates composed of potassium, aluminum, magnesium, iron, lithium, etc. Mica generally has polymorphisms, among which the monoclinic crystal system is the most common, followed by the trigonal crystal system. Mica usually takes the form of pseudo-hexagonal or rhombus-shaped plate, flake, or columnar […]