F. Aramu et al., MOSSBAUER-SPECTROSCOPY OF IRON COMPOUNDS IN RED RAIN, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 16(3), 1994, pp. 299-301
A sample of dust brought by rainfall to Cagliari was investigated by M
ossbauer spectroscopy. Spectral data show a high content of hematite m
ineral which is responsible for the reddish colour of the dust.