Hello, Sericite or Mica has a slight sheen. For a more matte finish, use Super-Matte (
Silk Sericite Powder ชนิดด้านพิเศษ (Super-Matte, Methicone Coated))
Synthetic Fluorphlogopite (Methicone Coated) will give whiter and more matt than Sericite or Mica (but it will cost more as well) I don't know members choose for what purpose in the formula So that I can recommend the type that is suitable for the formula.