 | Beurlen, H., Thomas, R., Melgarejo, J. C., Da Silva, J. M. R., Rhede, D., Soares, D. R., Da Silva, M. R. R. (2013) Chrysoberyl-sillimanite association from the Roncadeira pegmatite, Borborema Province, Brazil: implications for gemstone exploration. Journal of GEOsciences, 58 (2) 79-90 | Journal (article/letter/editorial) | | Chrysoberyl–sillimanite association from the Roncadeira pegmatite, Borborema Province, Brazil: implications for gemstone...Hélio Ramos s.n., 50740–530, Recife, Pernambuco, Brazil; beurlen@ufpe.br Helmholtz-Centre Potsdam, German...Tecnologia da Paraíba (IFPB), R. Tranquilino Coelho Lemos 671, 58100–000, Campina Grande – Paraíba, Brazil Corresponding...chrysoberyl in the Borborema Pegmatite Province (BPP) in northeastern Brazil is reported from up to 0.5...large boulders in the dumps covering the Roncadeira pegmatite, worked in the 1940’s for Sn- and Ta-ore |  | Beurlen, H., Barreto, S. B., Silva, D., Wirth, R., Olivier, P. (2007) TITANIAN IXIOLITE - NIOBIAN RUTILE INTERGROWTHS FROM THE BORBOREMA PEGMATITIC PROVINCE, NORTHEASTERN BRAZIL. The Canadian Mineralogist, 45 (6) 1367-1387 doi:10.3749/canmin.45.6.1367 | Journal (article/letter/editorial) | | THE BORBOREMA PEGMATITIC PROVINCE, NORTHEASTERN BRAZIL Hartmut BEURLEN§ Programa de PG em Geociências...Hélio Ramos s.n., 50740–530 Recife, Pernambuco, Brazil Sandra Brito BARRETO Deptamento de Geologia, Universidade...Hélio Ramos s.n., 50740–530, Recife, Pernambuco, Brazil Dailto SILVA Instituto de Geociências, IGE–UNICAMP...Barão Geraldo, 13083–970 Campinas, São Paulo State, Brazil Richard WIRTH GeoForschungsZentrum Potsdam, Telegrafenberg...Hélio Ramos s.n., 50740–530, Recife, Pernambuco, Brazil Abstract Intergrowths of orthorhombic and tetragonal |  | Beurlen, Hartmut, Da Silva, Marcelo R. R., Thomas, Rainer, Soares, Dwight R., Olivier, Patrick (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 (2) 207-228 doi:10.1007/s00126-007-0152-4 | Journal (article/letter/editorial) | | rareelement granitic pegmatite fractionation in the Borborema Province, Northeastern Brazil Hartmut Beurlen...Borborema Pegmatitic Province (BPP), northeastern Brazil, is historically important for tantalum mining...the production of gem quality, turquoise blue, ‘Paraíba Elbaite.’ With more than 750 registered mineralized...mostly hosted by a sequence of Neoproterozoic cordierite–sillimanite biotite schists of the Seridó Formation...n., Cidade Universitária, 50740-530 Recife, PE, Brazil e-mail: beurlen@terra.com.br M. R. R. Da Silva |  | | Journal (issue) | | 2016 • Blue sapphire rush in Madagascar • Red cordierite from Madagascar • Corundum from Muling, China...ct quartz disk and inserted rough crystals of Paraíba tourmaline, haüyne, ruby, and spessartine garnet...featuring elements of sagenitic quartz, fire agate, Paraíba tourmaline, and braided leather, centered on a...chrysoberyl is frequently crystallized directly from a pegmatite melt or in a reaction zone between a pegmatitic...alexandrite, formation often occurs by reaction of a pegmatite intruding mafic or ultramafic rocks. Chrysoberyl |
|
