The best position and the elements of the uncommon mineral pseudobrookite have been the subject of numerous studies and there is little uniformity in their treatment by various authors. Doubtless the small size and poor average quality of the crystals available have combined to lead to this result. A recent crystallo-graphic study of pseudobrookite from Utah by the writer yielded results that seem at least as good as any previously published and led him to review the data on the subject which are here collected in brief résumé and in tabular form.

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