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Biomica chemical composition: K(Mg, Fe 2+ ) 3 (Al, Fe 3+ )Si 3 O 10 (OH,F) 2 , the isomorphism is replaced by a wide range of species, so the biotite produced in different rocks, The chemical composition is very different. The biotite in the general acidic and alkaline magmatic rocks is high in FeO and low in MgO. The biotite in the basic and ultrabasic rocks is high in MgO and low in FeO. The biotite in the alkaline pegmatite has low MgO. Fe 2 O 3 is relatively higher.
Crystal morphology biotite and phlogopite same. The color is black, dark brown, sometimes with light red, light green or other shades. It is light reddish-brown with high titanium and green when it is rich in high-priced iron . Transparent to opaque. The glass is shiny and the black is semi-metallic. Hardness 2-3, specific gravity 3.02-3.12. The microscope is yellow, brown or green under transmitted light. The biotite can be etched into other minerals such as chlorite, muscovite and sericite by the action of hot aqueous solution. Because of its high iron content and poor insulation properties, biotite is far less than muscovite. Black mica flakes are often used as building material fillers. The large-size black mica is easily identified by the complete cleavage of mica according to its flaky form, deeper color and elasticity, and the characteristics of magnetism after heating, and can be distinguished in deep diagenetic and pale diagenetic clocks. Especially in acidic or alkaline rocks, most of them contain biotite. 