FE3-CRYSTAL ELECTRON-PARAMAGNETIC-RESONANCE (EPR)( IN VESUVIANITE FROM ZULOVA (CZECH. REPUBLIC) STUDIED BY SINGLE)

The electron paramagnetic resonance (EPR) spectrum of Fe3+ in a natura l single crystal of vesuvianite was investigated. The sample was taken from a contact metamorphic zone of limestone blocks in Zulova granite in the northern part of the Czech. Republic. The sample is of so-call ed high symmetry disordered type. The EPR measurements revealed that F e3+ substitutes the fivefold coordinated square-pyramidal B sites. In the single crystal EPR spectra no indication could be observed for a d istribution of Fe3+ over several sites though powder EPR spectra taken at 50 K do not rule out this possibility.