Goyazite from selected localities.
Brazil | |
| Berger, V.I., Singer, D.A., and Orris, G.J., 2009, Carbonatites of the world, explored deposits of Nb and REE; database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database. |
Orris, G.J., and Grauch, R.I. (2002): USGS Open-File Report 02-189. | |
Berger, V.I., Singer, D.A., and Orris, G.J. (2009): USGS Open-File Report 09-1139 |