Simpsonite from Brazil

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Brazil
Minas Gerais Itinga Monte Belo ⓘ Urubu mine	Atencio, D., Filho, R. R. C., Mills, S. J., Coutinho, J. M. V., Honorato, S. B., Ayala, A. P., Ellena, J., de Andrade, M. B. (2011) Rankamaite from the Urubu pegmatite, Itinga, Minas Gerais, Brazil: Crystal chemistry and Rietveld refinement. American Mineralogist, 96 (10) 1455-1460 doi:10.2138/am.2011.3594 Analysed (Reynaldo Contreira information)
Paraíba Junco do Seridó ⓘ Alto Cajazeiras	Pereira das Neves, P. S, and Atencio, D. (2018) Enciclopedia dos Minerais do Brasil v. 6: Tectossilicatos, p. 279, Ed. da Ulbra. Canaos, Brazil.
ⓘ Rio Grande do Norte
Equador ⓘ Alto do Giz pegmatite	Beurlen, H., Da Silva, M.R.R., Thomas, R., Soares, D.R., and Olivier, P. (2008): Nb–Ta–(Ti–Sn) oxide mineral chemistry as tracer of rare element granitic pegmatite fractionation in the Borborema Province, Northeastern Brazil. Mineralium Deposita 43, 207-228. Beurlen, H., Soares, D. R., Thomas, R., Prado-Borges, L. E., & Castro, C. D. (2005). Mineral chemistry of tantalate species new in the Borborema Pegmatitic Province, Northeast Brazil. Anais da Academia Brasileira de Ciências, 77(1), 169-182 Canadian Mineralogist (1986): 24: 655-663. Rob Lavinsky rruff.geo.arizona.edu (n.d.) http://rruff.geo.arizona.edu/doclib/hom/parabariomicrolite.pdf. Mineralogical Magazine 1963 33 : 458-466