The EPR spectrum at 9.1 GHz of theM=1/2harr;hyphen;1/2 transition for Mn2+in polycrystalline dolomite has been studied using a detailed computer simulation of the line shapes in the powder pattern spectrum. The accuracy of the analytical procedure was verified for the spectrum of Mn2+in calcite, yielding magnetic constants which were in excellent agreement with previous polycrystalline and single crystal results. The EPR parameters obtained for Mn2+in dolomite areg=2.0020(2),A=minus;9.48(2) mT for Mn2+substituted in the Ca lattice site andg=2.0028(2),A=minus;9.25(2) mT,D=14.60(5) mT for substitution at the Mg site.
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