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Principal magnetic susceptibilities and crystal anisotropy of six samples of mineral siderite have been measured from 100°K to 500°K. Each sample was analyzed for its chemical composition. It has been shown that the crystalline electric field acting on ferrous ion in siderite is of trigonal symmetry. A broad maxima in susceptibility versus temperature around 300°K has been observed. Variation of observed magnetic moment normal to the trigonal axis is complicated.
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Mookherji et al. (1965) studied this question.
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