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USA | |
| Brackett, R.N., Williams, J.F. (1891) Newtonite and rectorite - two new minerals of the kaolinite group. American Journal of Science: 142: 11-21. |
| Rocks and Minerals, (1976) 51:495-507. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Arkansas Geological Survey |
| Arkansas Geological Survey |
| Arkansas Geological Survey |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Arkansas Geological Commission |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Miser, H. D. (1917). Manganese deposits of the Caddo Gap and De Queen quadrangles, Arkansas. Contributions to Economic Geology 1917. US Government Printing Office. pp 59-112 |
| Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 803. |
| Am Min 51:1811-1814 |
| Arkansas Geological Survey |
| Arkansas Geological Survey |
| Arkansas Geological Survey |