phlogopite

A yellow to dark brown mica, K(Mg,Fe)₃AlSi₃O₁₀(OH)₂, used in insulation.

A kind of magnesia mica (see mica, 1) commonly occurring in crystalline limestone and in serpentine.

A kind of mica having generally a peculiar bronze-red or copperlike color and a pearly luster. It is a silicate of aluminia, with magnesia, potash, and some fluorine. It is characteristic of crystalline limestone or dolomite and serpentine. See mica.

A mica mineral with the chemical formula KMg3AlSi3O10(F,OH)2, a basic potassium magnesium aluminosilicate, used as an insulator.

a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum