Mica

Abstract

Mica is a platy mineral occurring in a variety of complex hydrous aluminosilicate forms with differing chemical composition and physical properties. Principal minerals in the mica group include muscovite - potassium mica (colorless or pale green/ruby), phlogopite - magnesium mica (dark brown or amber), biotite - magnesium-iron mica (black or dark green), and lepidolite - lithium mica (lilac). The section discusses mineralogy, deposits, geology, and exploration.