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USA | |
| Anderson,Eric Douglas and Moecher, David P.(2009) Formation Of The High -Pressure Metabasites In The Southern Appalachian Blue Ridge via Taconic Continental Subduction Beneath The Laurentian Margin: Tectonic Vol.28 (5) October |
| J. Metamorphic Geol. 21:685–698 (2003) |
| U.S Bureau of Mines/Spatial Data from the Minerals System/Mineral Industry Location System(Mas/Mils)CD-Rom,Sep,1995 |
| [var. Cyrtolite] www.johnbetts-fineminerals.com |
| Dockal, James A., and Smith, Michael S. (2007) Petrography of the County Rock Surrounding the Crabtree Pegmatite, Spruce Pine District, Mitchell County, North Carolina :University of North Carolina Wilmington |
| [var. Cyrtolite] Smithsonian Institution Mineral Reference Collection No. R13652-00 |
| [var. Cyrtolite] |
| [var. Cyrtolite] Wilson, W.F., McKenzie, B.J. (1978) Mineral Collecting Sites in North Carolina. Information Circular 24. North Carolina Division of Mineral Resources |
Spruce Pine, Mitchell County, North Carolina, USA