Abstract
Kankite from the Suzukura mine, Yamanashi Prefecture, is found in a wet depression on the dump without accompanying any other secondary minerals than amorphous iron hydroxide. The wet chemical analysis containing 2.25% SO3 yields two alternative ideal formulae, FeAsO4·3H2O and Fe8 [(As,S)O4]7(H2O,OH)22–24, the former being close to the original one. Slight differences are found in DTA and TG curves and infrared absorption spectra from those of the original one, but the coincidence of X-ray powder diffraction pattern warrants the substantial identity.
