Sepiolite is rhomboidal or single rhomboidal; Color changes, general maitain light white or gray; With silky luster. sometimes appeared waxy sheen; showed traces of a white, opaque, allodynia smooth and sticky tongue; Her hardness of between 2 ~ 2.5; Physique light, with a density of 1 ~ 2.2g/cm3; low shrinkage rate, and plasticity that can be dissolved in hydrochloric acid. Sepiolite, the chemical composition of silicon (Si) and magnesium (Mg); Mg8 chemical formula of (H2O) 4 [Si6O16] 2 (OH) 4.8 H2O, which the silica content of 54 ~ 60% between MgO content in the 21 ~ 25% range. Sepiolite with strong adsorption, and scattered bleaching properties, has a very high thermal stability, Railways up to 1500 ~ 1700 ° C, shape, insulation, salt was very good.