Gadolinite-(Y), Gadolinite-(Ce)
North Sugarloaf Mountain locality, Bethlehem, Grafton County, New Hampshire, USA
Reference: "Pegmatite and Miarolitic Cavity Minerals of North Sugarloaf Mountain Bethlehem New Hampshire", Whittemore and Janules, Rocks & Minerals, Vol. 65, No. 4. "SEM EDS analysis .... showed compositions intermediate between gadolinite-(Y) and gadolinite-(Ce)"