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USA | |
| Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages. |
| [var. Sunstone] Dorothy M. Schlegal (1957) Gem Stones of the United States : USGS Bulletin 1042-G |
| V.C. Fryklund and D.F. Holbrook (1950) Titanium Ore Deposit of Hot Spring County Arkansas, Bulletin 16 Arkansas Geological Survey |
| V.C. Fryklund and D.F. Holbrook (1950) Titanium Ore Deposit of Hot Spring County Arkansas, Bulletin 16 Arkansas Geological Survey Rocks & Min.: 63:110. |
| Dummett, H. T. (1987). Geology and petrography of the Twin Knobs# 1 lamproite, Pike County, Arkansas. Mantle Metasomatism and Alkaline Magmatism, 215, 205. |
| Jay Ellis Ransom,1974, Gems and Minerals of America |