Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil
Fuente:
Redalyc
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Academia Brasileira de Ciências
2005
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1876426062441742336 |
|---|---|
| author | Hugo S. Vilarroel Leo |
| author_facet | Hugo S. Vilarroel Leo |
| contents | Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil Hugo S. Vilarroel Leo Ana Cláudia Mousinho Ferreira Valderez P. Ferreira Dwight R. Soares Multidisciplinaria (Ciencias Naturales y Exactas) elbaite tourmaline Seridó pegmatitic province The Alto Quixaba pegmatite, Seridó region, northeastern Brazil, is a 60◦/80◦SW-trending subvertical dikediscordantly intruded into biotite schists of the Upper Neoproterozoic Seridó Formation. It has three distinctmineralogical and textural zones, besides a replacement body that cuts the pegmatite at its central portionand in which occur, among other gem minerals, colored elbaites. Elbaites usually occur as prismatic crystals,elongate according to the c-axis, with rounded faces and striations parallel to this axis. Optically, crystals areuniaxial negative with strong pleochroism; refractive index extraordinary axis = 1.619-1.622 and ordinaryaxis = 1.639-1.643, birefringence between 0.019 and 0.021, average relative density of 3.07, and the followingunit cell parameters: ao = 15.845 Å, co = 7.085 Å and V = 1540.476 Å. There is alkali deficiency in the Xsite of 12-17%. The elbaites are relatively enriched in MnO (1.69 to 2.87%) and ZnO (up to 2.98%). 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777411 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.77 |
| format | Artículo científico |
| id | redalyc_32777411 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil Hugo S. Vilarroel Leo Multidisciplinaria (Ciencias Naturales y Exactas) elbaite tourmaline Seridó pegmatitic province Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil Hugo S. Vilarroel Leo Ana Cláudia Mousinho Ferreira Valderez P. Ferreira Dwight R. Soares Multidisciplinaria (Ciencias Naturales y Exactas) elbaite tourmaline Seridó pegmatitic province The Alto Quixaba pegmatite, Seridó region, northeastern Brazil, is a 60◦/80◦SW-trending subvertical dikediscordantly intruded into biotite schists of the Upper Neoproterozoic Seridó Formation. It has three distinctmineralogical and textural zones, besides a replacement body that cuts the pegmatite at its central portionand in which occur, among other gem minerals, colored elbaites. Elbaites usually occur as prismatic crystals,elongate according to the c-axis, with rounded faces and striations parallel to this axis. Optically, crystals areuniaxial negative with strong pleochroism; refractive index extraordinary axis = 1.619-1.622 and ordinaryaxis = 1.639-1.643, birefringence between 0.019 and 0.021, average relative density of 3.07, and the followingunit cell parameters: ao = 15.845 Å, co = 7.085 Å and V = 1540.476 Å. There is alkali deficiency in the Xsite of 12-17%. The elbaites are relatively enriched in MnO (1.69 to 2.87%) and ZnO (up to 2.98%). 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777411 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.77 |
| title | Chemical and mineralogical characterization of elbaites from the Alto Quixaba pegmatite, Seridó province, NE Brazil |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) elbaite tourmaline Seridó pegmatitic province |
| url | https://www.redalyc.org/articulo.oa?id=32777411 |