Electron paramagnetic resonance and optical absorption spectral studies on covellite mineral.

ABSTRACT

A covellite mineral sample from Coquimbo region, Chile is used in the present study. An electron paramagnetic resonance (EPR) study on powdered sample confirms the presence of Mn(II) and Cu(II). Optical absorption spectrum indicates that Fe(II) and Cu(II) impurities are present in octahedral structure. Bands in the near-infrared from 7,000 to 5,000 cm(-1) result from the overtones of the first fundamental OH-stretching modes.