Magnetic susceptibility determinations were made on apatites of the composition, , where α varies from 0.1 to 5.0 and . Values of the effective magnetic moment close to 5.92 are evidence for all of the manganese being divalent, and linear change of lattice parameters and refractive indices with manganese concentration indicate complete solid solution of manganese. For both chlorapatite and fluorapatite the Weiss constant varies linearly with manganese concentration, with the magnetic interaction being somewhat larger for the former. The linear variation of the Weiss constant is interpreted as indicating a constant distribution ratio of manganese between the two cation sites in the apatite structure.
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J. A. Parodi (1969) studied this question.
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