The rare mineral thortveitite, chiefly of interest as the only available source of scandium in quantity, was first described by J. Schetelig, and has also been studied by A. Lacroix. The data so far presented by both these workers are adequately covered by the former. The crystal structure has been studied by F. Zachariasen. A description of the original locality in Norway, and a discussion of the paragenesis of the mineral has been published by H. Bjørlykke.

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