VERMICULITE 90%

Black mica:

The main specifications of the production of black mica in our factory include: 20 mesh, 40 mesh, 60 mesh, 80 mesh, 100 mesh, 200 mesh, 325 mesh, 400 mesh, 500 mesh, mesh, 600 mesh, 800 mesh, mesh, 1000 mesh, 1250 mesh, mesh, 2500 mesh. Chemical composition of black mica: K (Mg, Fe2+) 3 (Al, Fe3+) Si3O10 (OH, F) 2, similar to the same as the same as the substitute for a wide range, so different rocks in the production of black mica, its chemical composition of a large gap. General acidic and alkaline magmatite in biotite, high FeO, low MgO; basic and ultrabasic rocks in biotite, high MgO, low FeO; in alkaline pegmatites of biotite, MgO low, Fe2O3 is relatively high.

The crystal form of the black mica is the same as that of the mica. The color is black, dark brown, sometimes with pale red, light green or other colors. It is reddish brown with titanium high, high iron rich green. Transparent to opaque. Glass luster, black is semi metallic luster. The hardness of 2-3, the proportion of 3.023.12. Black mica heating solution effects can be altered to chlorite, muscovite, sericite and other minerals. Better performance of black mica. Biotite fritter is used as a building material filler. The larger particle size of biotite, extremely easy to slice according to its morphology, deep color and elasticity, has complete cleavage mica, and after heating, can be slightly magnetic characteristics to differentiate in deep rock and hypabyssal rocks clock, especially in acidic or alkaline rocks, mostly contain biotite.