By use of the 210 and 111 or 120 and 101 d spacings, the S and Co contents of loellingite can be determined within + or - 0.2 and + or - 0.5 weight percent, respectively. Synthetic loellingites with 0 to 3.1 weight percent S were used together with synthetic loellingite-safflorites with 0 to 13.5 weight percent Co for the determinative chart. This procedure should not be used if the Ni content of the mineral exceeds 1%.

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