Calkinsite-(Ce), Sanidine, Pyrrhotite
Vermiculite prospect No. 6, Big Sandy Creek, Bearpaw Mountains, Hill County, Montana, USA
Pale yellow porous to platy calkinsite, probably intermixed with lanthanite, with translucent colorless to white sanidine and minor pyrrhotite; this was labeled as burbankite, but has been weathered into calkinsite as per the published type locality description of the two minerals.
S420-908 N7586N
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