Abstract

A systematic study of the compositions of individual microspheres with sizes of 90 wt % and FeO 90 wt % and FeO = 3–6 wt %. Mineral precursors of microspheres of group (3), SiO2 + Al2O3 < 90 wt % and FeO to 11 wt %, were mixed-layer illite–montmorillonites with a high degree of cationic substitution with iron and Fe3+ included into interlayer sites.

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