In this study we present the data of investigation of the biomineral (SiO2) particles of the brown algae: Fucus evanescence (C.Agardh 1820), Turbinaria ornate (Turner 1807), Sargassum miyabei (Yendo, 1907), Dictyota dichotoma (Hudson) J.V.Lamouroux 1809. 2 wide-spread morphotypes of mineral particles were found using optical microscopy: irregular smooth (15-47,34%) and irregular ruminate (27-64%).