EPR, Optical and LR spectral studies on a naturally occurring mineral melan
terite are carried out at room temperature. EPR studies indicate the presen
ce of Cu(II) ion in tetragonally distorted octahedral sire and hyperfine Li
nes could not be resolved due to higher concentration of the paramagnetic i
mpurity in the mineral. Optical absorption spectrum is a characteristic of
Fe(II) and Cu(II) ions. Crystal field parameters art: evaluated. IR spectru
m confirms the presence of water and sulphate ions. (C) 2001 Elsevier Scien
ce B.V. All rights reserved.