Abstract
Abstract Mossbauer spectra corresponding to natural hexagonal and monoclinic pyrrhotite from Lake Victoria Goldfield in Tanzania (East Africa) were recorded between room temperature and 4.2 K. There is good agreement between experiment and the literature. The Mossbauer spectra of samples of monoclinic pyrrhotite are relatively narrow, but those corresponding to hexagonal pyrrhotite are very broad and asymmetric due to the vacancy distribution. The intensity ratios of the inequivalent Fe sites in monoclinic pyrrhotite are in the ratio of about 2:1:2:2 in the order of increasing hyperfine field, but those corresponding to hexagonal pyrrhotite do not have any particular pattern due to varying at.% Fe in the analysed material which is, in turn, related to the vacancy distribution.
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