Abstract: A ferrite toner carrier core composition derived from flyash comprising a mixture of spherical particulates of the general formula ##EQU1## wherein iron is the principal metallic element and i,j,k denote the number of atoms of monovalent, divalent and trivalent atoms present in one mole of the compound, andM.sub.x denotes monovalent atoms from Group IA of the Periodic Table, the alkali metals, usually sodium or potassium, alone or together.M.sub.y denotes divalent atoms from Group IIA of the Periodic Table, the alkali earth metals, usually magnesium or calcium, alone or together.M.sub.z denotes trivalent atoms from Group IVB, usually titanium, Group IVA, usually silicon and Group IIIA, usually aluminum. All permutations and combinations may be present.