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USA | |
| The Lapidary Journal, May 1985 (W.C. van Laer) The Mineral News (several issues) many ID by x-ray diffraction (Jim Wilson, Weber State W.C. van Laer, Montana Tech U.S. National Museum some by physical characteristics, i.e.: crystal form, fluorescence, magnetic attraction, etc.) some yet to be published |
| USGS Bulletin 988-G(1953) USGS Bull 988G |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Sweeney, Ryan (2018), personal communication with Mindat.org. |