 | 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...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...hosted by a sequence of Neoproterozoic cordierite–sillimanite biotite schists of the Seridó Formation and quartzites...n., Cidade Universitária, 50740-530 Recife, PE, Brazil e-mail: beurlen@terra.com.br M. R. R. Da Silva |  | | Journal (article/letter/editorial) | | quartz crystals in miarolitic, quartz-specularite pegmatite cavities within a 1 m thick, strongly weathered...Davidson 2016b). Some melt inclusions in granite, pegmatite, and tectonic quartz veins from the Königshain...Chrysoberyl-sillimanite association from the Roncadeira pegmatite, Borborema Province, Brazil: implications...Thomas R, Davidson P (2012) Water in granite and pegmatite-forming melts. Ore Geology Reviews 46:32–46 Thomas |  | | Journal (issue) | | synthetic moissanite 386 Gem Notes Large kunzite from Brazil| Marble-hosted ruby mine, Mogok, Myanmar|Secondary...from Idaho|Dumortierite inclusions in quartz from Brazil|Quartz sphere with large inclusion|Zawadi sapphires|Tourmaline...Kunzite Gem Crystal from Brazil The granitic pegmatites of Minas Gerais, Brazil, are well known for producing...kg. It was mined in 1998 from the Urucum pegmatite in Brazil. Photo by B. M. Laurs. (1962, p. 287) also...“flawless gems exceeding 300 carats have been cut in Brazil, and the author has cut a number of much larger |  | | Journal (issue) | | 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...recently described for alexandrites from Hematita, Brazil (Schmetzer and Hainschwang, 2012), but a pattern |
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