In 1930 Dr. Hugh S. Spence of the Department of Mines of Canada described1 a pegmatite rich in thucholite derived from uraninite from Henvey Township, Ontario. An important constituent of this pegmatite was an altered titanite intimately associated with thucholite. Dr. Spence submitted samples of this titanite to the Harvard Mineralogical Museum for examination as to the nature of its alteration, and the microscopic study of these specimens was entrusted to the author since the unusual type of alteration-product seemed to merit detailed description.

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