Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais)
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | REM - International Engineering Journal |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100037 |
Resumo: | Abstract The Espinhaço Range, in the Diamantina region (central part of the State of Minas Gerais), is known worldwide as a famous source of associated occurrence of quartz, rutile and/or anatase crystals. The latter is also a classic accompanying mineral of diamonds in the alluvial placers. Primary anatase is related to hydrothermal quartz veins cutting geological units of the Espinhaço Range. In the last decade, outstanding large sized anatase crystals (up to 4 cm) in such veins have been reported from two areas, showing unusual habits and partial intergrowth with rutile. They are colorless, ocher brown, or golden yellowish, often double terminated, and iron rich. Due to their strong adamantine luster and pseudo-octahedral habit, some resemble diamonds. Two different morphological types have been studied: a simple crystal habit solely with {011} faces, and double terminated complex anatase crystals with one or more of the following forms: {011}, {012}, {013}, {017} and {112}. The geological environments as well as general mineralogical characteristics are also described. |
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Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais)anatasequartz veinsDiamantina regionEspinhaço RangeAbstract The Espinhaço Range, in the Diamantina region (central part of the State of Minas Gerais), is known worldwide as a famous source of associated occurrence of quartz, rutile and/or anatase crystals. The latter is also a classic accompanying mineral of diamonds in the alluvial placers. Primary anatase is related to hydrothermal quartz veins cutting geological units of the Espinhaço Range. In the last decade, outstanding large sized anatase crystals (up to 4 cm) in such veins have been reported from two areas, showing unusual habits and partial intergrowth with rutile. They are colorless, ocher brown, or golden yellowish, often double terminated, and iron rich. Due to their strong adamantine luster and pseudo-octahedral habit, some resemble diamonds. Two different morphological types have been studied: a simple crystal habit solely with {011} faces, and double terminated complex anatase crystals with one or more of the following forms: {011}, {012}, {013}, {017} and {112}. The geological environments as well as general mineralogical characteristics are also described.Fundação Gorceix2018-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100037REM - International Engineering Journal v.71 n.1 2018reponame:REM - International Engineering Journalinstname:Fundação Gorceix (FG)instacron:FG10.1590/0370-44672017710069info:eu-repo/semantics/openAccessChaves,Mario Luiz de Sá C.Karfunkel,JoachimBermanec,VladimirZebec,VladimirScholz,RicardoMenezes Filho,Luiz Alberto D.eng2018-01-09T00:00:00Zoai:scielo:S2448-167X2018000100037Revistahttps://www.rem.com.br/?lang=pt-brPRIhttps://old.scielo.br/oai/scielo-oai.php||editor@rem.com.br2448-167X2448-167Xopendoar:2018-01-09T00:00REM - International Engineering Journal - Fundação Gorceix (FG)false |
dc.title.none.fl_str_mv |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
title |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
spellingShingle |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) Chaves,Mario Luiz de Sá C. anatase quartz veins Diamantina region Espinhaço Range |
title_short |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
title_full |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
title_fullStr |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
title_full_unstemmed |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
title_sort |
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais) |
author |
Chaves,Mario Luiz de Sá C. |
author_facet |
Chaves,Mario Luiz de Sá C. Karfunkel,Joachim Bermanec,Vladimir Zebec,Vladimir Scholz,Ricardo Menezes Filho,Luiz Alberto D. |
author_role |
author |
author2 |
Karfunkel,Joachim Bermanec,Vladimir Zebec,Vladimir Scholz,Ricardo Menezes Filho,Luiz Alberto D. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Chaves,Mario Luiz de Sá C. Karfunkel,Joachim Bermanec,Vladimir Zebec,Vladimir Scholz,Ricardo Menezes Filho,Luiz Alberto D. |
dc.subject.por.fl_str_mv |
anatase quartz veins Diamantina region Espinhaço Range |
topic |
anatase quartz veins Diamantina region Espinhaço Range |
description |
Abstract The Espinhaço Range, in the Diamantina region (central part of the State of Minas Gerais), is known worldwide as a famous source of associated occurrence of quartz, rutile and/or anatase crystals. The latter is also a classic accompanying mineral of diamonds in the alluvial placers. Primary anatase is related to hydrothermal quartz veins cutting geological units of the Espinhaço Range. In the last decade, outstanding large sized anatase crystals (up to 4 cm) in such veins have been reported from two areas, showing unusual habits and partial intergrowth with rutile. They are colorless, ocher brown, or golden yellowish, often double terminated, and iron rich. Due to their strong adamantine luster and pseudo-octahedral habit, some resemble diamonds. Two different morphological types have been studied: a simple crystal habit solely with {011} faces, and double terminated complex anatase crystals with one or more of the following forms: {011}, {012}, {013}, {017} and {112}. The geological environments as well as general mineralogical characteristics are also described. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100037 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100037 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0370-44672017710069 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Fundação Gorceix |
publisher.none.fl_str_mv |
Fundação Gorceix |
dc.source.none.fl_str_mv |
REM - International Engineering Journal v.71 n.1 2018 reponame:REM - International Engineering Journal instname:Fundação Gorceix (FG) instacron:FG |
instname_str |
Fundação Gorceix (FG) |
instacron_str |
FG |
institution |
FG |
reponame_str |
REM - International Engineering Journal |
collection |
REM - International Engineering Journal |
repository.name.fl_str_mv |
REM - International Engineering Journal - Fundação Gorceix (FG) |
repository.mail.fl_str_mv |
||editor@rem.com.br |
_version_ |
1754734690625912832 |