Cut sunstone (anorthite feldspar), pleochroic, 38.4 mm wide, 66 carats, modified pear cut, by Darryl Alexander. Sunstone Butte Mine, Plush, Lake County, Oregon, U.S.A. Donated by Doug and Robin Malby. Part of the Rice Museum Collection. Sunstone is the state gem of Oregon. Photo by Jeff Scovil.