Physical properties of titanomagnetite sands
Laboratory measurements of density, magnetic susceptibility, remanence, resistivity, and induced‐polarization response of New Zealand titanomagnetite sands (“ironsands”) were made for different volume concentrations [Formula: see text] of titanomagnetite in the range 10 to 100 percent. Both density ρ and magnetic susceptibility κ of these sands increase monotonically with [Formula: see text]; the observed variation of κ as a function of [Formula: see text] can be explained by changes of the resultant relative magnetic permeability μ of a binary mixture of magnetic and nonmagnetic grains. The natural remanence of titanomagnetite sands is small (Koenigsberger ratio Q < 0.2). No significant induced‐polarization response could be observed even for mixtures of almost pure titanomagnetite. When placed in an electric field, the titanomagnetite sands were found to be nonconductive.