	*Smith, Arthur E., Fritzsch, Eric (2000) SOUTH DAKOTA. Rocks & Minerals, 75 (3) 156-169 doi:10.1080/00357520009605635*	Journal (article/letter/editorial)
	[University of Connecticut] at 20:42 14 January 2015 South Dakota is perhaps best known for its pegmatites, which...Hills are responsible for the accessibility of South Dakota’s itbundant and diverse mineral locations...operated for more than 120 years, most mining in the area peaked in the late 1800s and early 1900s, with only...to be made. The most complete mineralogy of South Dakota and the Black Hills is found in Roberts and...the most complete location guides to mines in the area are those provided by the U.S. Bureau of Mines (1954
	*Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin* 18. South Dakota School of Mines and Technology**	Report (issue)
	STATE OF SOUTH DAKOTA Nils Boe, Governor MINERALOGY OF THE BLACK HILLS by WILLARD LINCOLN ROBERTS...Associate in Mineralogy Museum of Geology, South Dakota School of Mines and Technology and GEORGE RAPP...Department of Geology and Geological Engineering, South Dakota School of Mines and Technology With the Editorial...Mineralogy South Dakota School of Mines and Technology BULLETIN NUMBER 18 of the South Dakota School of...of Mines and Technology Rapid City, South Dakota PUBLICATIONS STAFF F. L. Partlo J. T. Thomas President

Amethyst from State Game Lodge area, Custer County, South Dakota, USA