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Phlogopite belongs to the mica mineral group. It has been occasionally called bronze mica.
Phlogopite can be divided into two types: fuscous phlogopite (all types of brown and green) and light coloured phlogopite (all types of light yellow) . Light coloured phlogopite is transparent and has vitreous luster, fuscous phlogopite is semitransparent, vitreous luster to metallic luster. Pure phlogopit is very good insulation material.