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Brazil | |
| [var. Strontium-bearing Crandallite] Cassedanne, J. P., Barreto da Silva Hen, L. (1991): Strontian crandallite from the Alto Benedito pegmatite, Paraiba, Brazil. Mineralogical Record, 22, 183-185. |
| Murdoch, J. (1955) Phosphate minerals of the Borborema pegmatites: I-Patrimonio. American Mineralogist: 40: 50-63. |
| Robinson, G.W., Wegner, R.R. (1998) Mineralogy of the Boqueiraozinho pegmatite, Parelhas, Rio Grande do Norte, Brazil. The Mineralogical Record: 29: 193-197. |