Pegmatites
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Mineralogical and gemological characterization of emerald crystals from Paraná deposit, NE Brazil: a study of mineral chemistry, absorption and reflectance spectroscopy and thermal analysis
Abstract The Paraná deposit, located at Southwestern Rio Grande do Norte state, in Brazil, is one of the few emerald deposits found at Borborema Province. The mineralization occurs in phlogopite schists and actinolite-phlogopite schists associated with pegmatites and albitites within the Portalegre Shear Zone. Unlike other well-known Brazilian emerald depos
Braz. J. Geol.. Publicado em: 22/08/2019
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2. A cathodoluminescence-assisted LA-ICP-MS study of topaz from different geological settings
ABSTRACT: In this study, the crystallization dynamics and the fingerprints of two topaz crystals from the Ouro Preto region (Brazil), two from the Eastern Brazilian Pegmatite Province (EBPP), one from the Western part of the United States (US) and one from Pakistan were characterized. The combination of scanning electron microscope-cathodoluminescence (SEM-C
Braz. J. Geol.. Publicado em: 2018-01
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3. Paralavas in the Cretaceous Paraná volcanic province, Brazil - A genetic interpretation of the volcanic rocks containing phenocrysts and glass
ABSTRACT The occurrences of glassy rocks containing long and curved phenocrysts in the Paraná volcanic province, South America, are here interpreted as paralavas. The large number of thin (0.1-0.5 m) dikes and sills of glassy volcanic rocks with hopper, hollow or curved, large crystals of clinopyroxene (up to 10 cm), plagioclase (up to 1 cm), magnetite and
An. Acad. Bras. Ciênc.. Publicado em: 2016-12
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4. Recent mineral discoveries in the Coronel Murta, Taquaral, and Medina pegmatite fields, northeastern Minas Gerais, Brazil
Abstract The occurrence of five rare minerals in the Eastern Brazilian Pegmatite Province, northeastern Minas Gerais, is described and discussed: bergslagite [CaBe(AsO4)(OH)] from the Manoel Fonseca mine, Coronel Murta county; herderite [CaBe(PO4)F] from the Funil mine, Medina county; lithiophosphate [Li3PO4] from the Cachoeira mine, Araçuaí/Itinga countie
REM, Int. Eng. J.. Publicado em: 2016-09
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5. Electron microprobe Th-U-Pb monazite dating and metamorphic evolution of the Acaiaca Granulite Complex, Minas Gerais, Brazil
Abstract The Acaiaca Complex (AC) is located in southeastern Minas Gerais state, and comprises felsic, mafic, ultramafic, and aluminous granulites as well as lower grade gneisses and mylonites. The complex is distributed over an area of ca. 36 km by 6 km, surrounded by amphibolite facies gneisses of the Mantiqueira Complex (MC). The discrepancy in the metamo
Rem: Rev. Esc. Minas. Publicado em: 2016-03
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6. Uncommon Nb-tantalate from the Cachoeira mine, Araçuaí pegmatite district (Minas Gerais)
Abstract Important spodumene-rich pegmatites have been mined by CBL (Companhia Brasileira de Lítio, Brazilian Lithium Co.) at the Cachoeira mine (northeastern Minas Gerais state) since the 1990's. In this deposit, black platy crystals resembling columbitetantalite are also found; they were analyzed by electronic microprobe as part of the first author's mast
Rem: Rev. Esc. Minas. Publicado em: 2015-12
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7. Aspectos sócio-econômico-ambiental do processo de extração do caulim no município de Junco do Seridó-PB
The paper entitled "Socio-Economic and Environmental Process Extraction of Kaolin in the Municipality of Junco do Seridó/PB" is a guided study on the extraction of kaolin in the municipality of Junco do Seridó/PB, which is the largest production center of this mineral in the state Paraíba. This activity is the basis of an extensive and complex supply chai
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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8. Obtenção de uma porcelana dielétrica a partir de matérias-primas do Rio Grande do Norte
The dielectric porcelain is usually obtained by mixing various raw materials proportions and is used in the production of electronic equipment for various applications, from capacitors of high and low Power to insulators for low, medium, high and extra high voltage, which are used in distribution lines and transmission of electricity.This work was directed t
Publicado em: 2010
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9. PETROGÊNESE DO COMPLEXO ACAIACA, MG
The Acaiaca Complex (AC) is composed of mainly granulite facies rocks distributed along the Acaiaca county and surroundings, east of the Quadrilátero Ferrífero. The present work aimed to investigate the lithological diversity of the AC with emphasis on the mineralogical, microstructural, geochemical and petrogenetic characterization. The lithostructural su
Publicado em: 2009
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10. Crystallochemistry study of pyrochlore group minerals from Brazil / Estudo cristaloquímico de minerais do grupo do pirocloro no Brasil
Os minerais do grupo do pirocloro (A2B2X6Y1) apresentam grande interesse econômico, principalmente como fonte de nióbio e tântalo, metais que possuem importantes aplicações tecnológicas como a fabricação de aço e a confecção de componentes eletrônicos. Apesar de seu interesse científico e econômico, a maioria das ocorrências brasileiras de min
Publicado em: 2007
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11. Flotação de espodumênio, microclina, quartzo e muscovita com coletores aniônicos, catiônicos, anfotéricos e mistura de coletores
The worldwide lithium consumption is chiefly associated with the industries such as primary aluminum, glass, ceramics and lubricants being distinguished however the increasing and strategical use of lithium in components of batteries, nuclear reactors, parts for the aeronautical industry and the manufacturing of pharmaceuticals. Production of lithium carbona
Publicado em: 2006
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12. Chemical, structural and optical characterisation of gemological tourmalines from pegmatites of the pegmatitic province of Borborema - batalha, capoeiras, quintos and bulandeira - in the districts of Rio Grande do Norte and Paraíba, NE of Brazil
Anais da Academia Brasileira de Ciências. Publicado em: 2000-12