Monazite-(Sm)
Brown Derby No. 1, Brown Derby Mine, Quartz Creek Pegmatite Mining District, Gunnison County, Colorado, USA
Crystalline associated with lepidolite; 6.8x5x1.5cm; This specimen was analyzed at the University of Oklahoma, and confirmed. Only the third reported occurrence, and large samples for the species, all obtained from one oval mass on lepidolite, cleavelandite, quartz pegmatite. Truly the most unique find of my collecting experience. Many thanks to ...