Titanomagnetite and titanomaghemite in a Hawaiian soil

ABSTRACT Large amounts of titanomaghemite containing as much as 33 percent TiO2 by mol ratio as an essential component have been found in a Hawaiian soil. This titanomagnetite was probably formed by the direct oxidation of primary titanomagnetite occurring in basaltic rocks without any subtraction of iron from the system or addition of titanium into the system.