| abstract |
Spherical crystalline silica particles having higher productivity and lower production cost than those of the prior art and having a high thermal expansion coefficient, high thermal conductivity, high flowability, high dispersibility, high chargeability, low abrasion resistance and high purity, . Spherical crystalline silica particles characterized by comprising 400 to 5000 ppm of aluminum and containing at least 80% of a crystalline phase. |