Abstract
Unusually fine specimens of thulite occur at the Camp Creek corundum deposit in the NE , sec. 36, T. 8 S., R. 8 W., about mile southwest of the Crystal Graphite mine and about 11 miles southeast of Dillon in southwestern Montana. The occurrence is at an elevation of about 7000 feet near the southwestern corner of the southern Ruby Range. The thulite occurs in a lens of impure marble, 280 feet long and as much as 100 feet thick, which is enclosed in a northeast-trending layer of biotite schist, both forming part of the Prebeltian Cherry Creek Group (Heinrich, 1950; Heinrich and Rabbitt, 1960).
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