In connection with a proposal to the Commission on New Minerals and Mineral Names of the International Mineralogical Association for a new mineral containing V4+, the chairman of that commission remarked that the Gladstone–Dale compatibility index (CI) is poor, as it is for two other species containing VO2. This prompted the author to re-examine the derivation of that constant. At the time the value of 0.393 was published, 1976, there were few published descriptions of minerals containing V4+ that had sufficient data from which to derive a Gladstone– Dale constant for VO2. In...

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