... of organic impurities such as Fe2O3,CaO,MgO,Al2O3. The high-quality diatomite appears white, with Sio2 content over 70%. Monomer diatom ... unique microcellular structure endows them many excellent and unique functions: high pore volume, large specific surface, small specific gravity, strong ... be arranged according to the customer request.6)photo: factory price---high quality diatomite product