Abstract
Abstract Results of heating experiments, with microscopic, X-ray, thermomagnetic, and chemical data, are related to previous ironsand investigations. Reducing runs were made in coal gas, hydrogen, and buffered hydrous atmospheres. For the last, the end-product compositions agree well with published data for the synthetic Fe-Ti-O system. Earlier conclusions about thermomagnetic behaviour of ironsand titano-magnetites are confirmed. On heating in air homogeneous titanomagnetite is oxidised to homogeneous titanhematite. Inhomogeneous titanomagnetite grains remain so, the final product containing cubic residua strongly enriched in minor constituents (Mg, Mn, Al, and possibly V), and Ti is found only in the titanhematite phase. Possible economic implications are briefly discussed. Pseudobrookite is tentatively identified in rare grains in natural titanomagnetite concentrates and in products of the oxidising run. Its scarcity is attributed to the low TiO2 content of New Zealand ironsand magnetites.
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