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Biotite Mica
Biotite is in black or dark brown, sometimes with light red, light green or other tones. It is in light reddish brown with high titanium content and in green with high ferric iron content. Biotite has vitreous luster and its cleavage plane has nacreous luster. Biotite is also featured by its extremely high electric insulativity, good acid and alkaline corrosion resistance, thermal and acoustic insulation and small thermal expansion. Huayuan Biotite is widely used in building materials, firefighting, extinguishing agent, welding electrodes, paper making and asphalt paper.
