“A small but intricate cluster of fairly sharp samarskite-(Y) crystals (overall dimensions 15 by 15 by 22 mm) dug from the floor of the open cut. The parallel and subparallel clusters stand out like a miniature cityscape. Samarskite from the Spinelli Prospect played an important role in the development of accurate radiometric dating using a mass spectrometer (Nier, Thompson, Murphey, Phys. Rev., v. 60, p. 112-116, 1941). The Samarskite-(Y) crystals from this locality are the best of species. (Note: Private property; specimens collected with permission) Field collected by, photographed by, and in the collection of Fred E Davis, 2008.”