Vermiculite and vermiculite ore called, is not referred to expansion of the vermiculite. Vermiculite mined to get rid of impurities, apparent on a sheet, so called vermiculite, also known as the ore vermiculite, vermiculite ore, raw vermiculite, not expanded vermiculite, unexpanded vermiculite stone. Vermiculite chemical formula (Mg, Ca) 0.7 (Mg, Fe, Al) 6.0 [(Al, Si) 8.0] (OH4.8H2O). Monoclinic system, often flaky. Brown, brown or bronze. Oil sheen. Hardness of 1 to 1.5. Density of 2.4 ~ 2.7g/cm3 vermiculite calcined at 800 ~ 1000 ℃, the volume of rapid expansion, increasing from 6 to 15 times as high as up to 30 times. Expansion of vermiculite average bulk density of 100 ~ 200Kg/m3 there is a small roasted vermiculite expansion of the role of air compartment, it has excellent insulation properties. 

 Vermiculite often accordance with the biotite or phlogopite was illusion. Mostly brown, yellowish brown, golden, bronze, sometimes with green. Luster than the mica is weak, oil sheen or luster of pearls. Cleavage completely, slice flexible. Hardness of 1 to 1.5. The relative density of 2.4 to 2.7. The polarizing microscope: pleochroism colorless to light brown. Two-axis crystal (-), the optical axis angle is very small. Ng = 1.545 ~ 1.585, Nm = 1.540 ~ 1.580 and Np = 1.525 ~ 1.560. Expansion; cation exchange and adsorption; expanded vermiculite has good water absorption; noise; insulation and fire resistance; freezing tolerance; chemically stable expansion of vermiculite. Insoluble in water. pH value of 7 to 8. Non-toxic, tasteless, no side effects. 

 The use of vermiculite has been widely applied to the construction, metallurgy, petroleum, shipbuilding, environmental protection, thermal insulation, thermal insulation, insulation, energy saving and other fields. Animal husbandry: the expanded vermiculite unique structural characteristics and surface properties, as well as non-toxic, sterile and chemically inert, can be used as a carrier, adsorbent, fixing agent, and feed additives. 

 Other applications: as a filler to add friction materials, can play the role of enhancers, thermal stabilizer. Brake pads made of vermiculite has good heat resistance and shear, bending strength, good braking effect. Vermiculite carrier production of essential oils, spices, and scattered incense for a long time. 
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