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Phlogopite is characterized by complete cleavage of mica, yellow brown color and golden like reflection. It is different from Muscovite in that it can decompose in boiling sulfuric acid and produce an emulsion solution at the same time, while Muscovite cannot; It differs from biotite in light color. Phlogopite can be corroded by concentrated sulfuric acid, and can be decomposed in concentrated sulfuric acid to produce an emulsion solution at the same time. Sodium, calcium and barium replace potassium in the chemical composition; Magnesium is replaced by titanium, iron, manganese, chromium and fluorine instead of Oh, and the varieties of phlogopite include manganese mica, titanium mica, chrome phlogopite, fluorophlogopite, etc. Phlogopite mainly occurs in contact metamorphic zones of ultrabasic rocks such as kimberlite and dolomitic marble. Impure magnesian limestone can also be formed during regional metamorphism. Phlogopite is different from Muscovite in physical and chemical properties, so it has many special functions and is used in many important fields.