I. Structure and chemical composition of sericite mica
The Sericite mica is one kind of natural fine grain muscovite mica, is subspecies of muscovite, is the laminated structure silicate, the structure clamps an alumina octahedron constitution duplicate silica level by two silicas tetrahedrons (to see chart one). {001} cleaves completely, may deduct the extremely thin laminated shape, the piece thick may reach below 1u (theoretically to be possible to hew 0.001u), the big ratio of diameter to thickness. Compares with muscovite mica: has the natural particle size small, is easy to process the superfine characteristic. The sericite mica crystal chemical formula is: K_0.5-1(Al,Fe,Mg)₂(SiAl)₄O₁₀(OH)₂▪nH₂O,, General chemical composition: SiO₂ 43.13~49.04%， Al₂O₃ 27.93~37.44%，  K₂O+Na₂O 9~11%，H₂O 4.13~6.12%。
II. Physical property of Sericite mica
The Sericite mica belongs to the monocline crystal, the crystal for scaled, has silk-like the luster (muscovite mica to assume glassy luster), the pure block assumes grey color, the purple rose color, the white and so on. The aspect ratio >80, specific gravity 2.6~2.7, hardness 2~3, rich elasticity, easy curving, the abrasion resistance and the resistance to wear are good, the higher heat-resisting insulation, is difficult to dissolve in the acid and alkali solution, the chemical property is stable. Test data: The elasticity coefficient is 1505~2134MPa, heatproof quality 500~600 oC, thermal conductivity 0.419~0.670 W.(m.K)-1, electric insulation properties 200kv/Mm, anti- radioactive 5×1014 thermal neutron/ cm22 to degree of illumination.

Moreover, with similar mineral composition and structure to Kaolin, sericite mica also has some properties of clay, as good dispersibility in aqueous medium and in the organic solvent, certain viscosity, white color and fine granular. Therefore, sericite mica has many kinds of characteristics not only mica mineral and also clay mineral

III. Classification and distribution of domestic sericite mica ore deposit
Sericite mica mineral reserves rich resouces in China, distributed also broad, but the deposit worth developing and use are few. According to the sericite mica ore deposit origin, divides into generally the sheet sericite mica ore deposit (Anhui sericite mica ore), the porphyry alteration sericite mica ore deposit (Jiangxi porcelain quarry), the volcanic rock alteration sericite mica ore deposit , the secondary aposandstone illite sericite mica ore deposit (east Zhejiang volcano detritus alteration illite sericite mica ore), the clay stone sericite mica illite ore deposit. All of these sericite ores, the sheet sericite mica ore has highest development value, because mica characteristic of this kind sheet sericite mica ore is most obvious.