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        BIOTITE

        BIOTITE

         Biotite chemical composition : K (Mg, Fe2 +) 3 (Al, Fe3 +) Si3O10 (OH, F) 2, the same type of quality as substitute broad, different rocks output biotite, their chemical composition varies greatly. General acidic and alkaline igneous rocks of biotite, FeO, MgO low; Basic and ultrabasic rocks of biotite, MgO, FeO low; in alkaline pegmatite of biotite, low MgO and Fe2O3 be relatively higher.
          Biotite the chemical composition %:
        SiO 2 Al 2 O 3 K 2 O MgO Na 2 O S P Calcination
        45.02 10.46 10.18 16.88 0.46 0.46 0.34 1.93

         Black mica crystal form with the same mica. The color black, dark brown, sometimes with light red, light green or other colors. Ti-containing high lightly reddish-brown, is rich in iron price was green. Transparent to opaque. Glass sheen, there was a black semi-metallic sheen. Hardness 2 -3, the proportion of 3.02-3.12. Biotite heating solution can be altered role of chlorite, sericite muscovite and other minerals. Biotite because of high iron content, poor insulation performance, which was far narrower than muscovite. Biotite fine film materials used in packing material. Diameter larger biotite, in accordance with its very easy to flake form, the deeper the color and flexibility, with the complete mica cleavage, and heating, can be a bit of the characteristics of magnetic identification to be in deep and shallow diagenesis diagenesis bell, particularly acidic or alkaline rocks, containing mostly black mica.

         

         
         
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