{"id":1950,"date":"2025-08-26T14:22:24","date_gmt":"2025-08-26T17:22:24","guid":{"rendered":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/?p=1950"},"modified":"2025-09-02T14:08:57","modified_gmt":"2025-09-02T17:08:57","slug":"columbita-columbite","status":"publish","type":"post","link":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/columbita-columbite\/","title":{"rendered":"Columbita (Columbite)"},"content":{"rendered":"\n<p class=\"has-black-color has-text-color has-medium-font-size\">A columbita (Fe,Mn)(Nb,Ta)2O6(Fe,Mn)(Nb,Ta)_2O_6(Fe,Mn)(Nb,Ta)2\u200bO6\u200b \u00e9 um \u00f3xido do grupo columbita\u2013tantalita que cristaliza no sistema ortorr\u00f4mbico, formando cristais tabulares a prism\u00e1ticos, geralmente alongados, al\u00e9m de massas granulares ou compactas. Apresenta cor preta a preto-acastanhada, \u00e0s vezes com tons vermelhos ou marrons, brilho submet\u00e1lico a resinoso, dureza 6\u20136,5, densidade relativa vari\u00e1vel entre 5,2 e 7,3 (conforme o teor em t\u00e2ntalo), fratura subconchoidal a irregular e clivagem imperfeita. \u00c9 t\u00edpica de pegmatitos gran\u00edticos ricos em elementos raros, associada a espodum\u00eanio, lepidolita, turmalina, berilo e cassiterita, al\u00e9m de ocorrer em dep\u00f3sitos aluvionares. \u00c9 a principal fonte de ni\u00f3bio (ligas met\u00e1licas de alta resist\u00eancia, a\u00e7os especiais, supercondutores) e de t\u00e2ntalo (capacitores eletr\u00f4nicos, ligas resistentes ao calor, aplica\u00e7\u00f5es aeroespaciais). N\u00e3o \u00e9 usada como gema, mas tem import\u00e2ncia estrat\u00e9gica para ind\u00fastrias de alta tecnologia. Ocorre em dep\u00f3sitos no Brasil (Minas Gerais, Goi\u00e1s, Rond\u00f4nia), Nig\u00e9ria, Rep\u00fablica Democr\u00e1tica do Congo (coltan), Mo\u00e7ambique, Canad\u00e1 (Manitoba) e Estados Unidos (Dakota do Sul, Virg\u00ednia).<\/p>\n\n\n\n<div class=\"minerais-content\">\n<style>\n  \/* Quadradinhos na cor #9c5932 *\/\n  .minerais-content ul.custom-square {\n    list-style-type: none;\n    padding-left: 4em;\n  }\n  .minerais-content ul.custom-square li {\n    position: relative;\n    color: black;\n    margin-bottom: 0.3em;\n  }\n  .minerais-content ul.custom-square li::before {\n    content: \"\u25a0\";\n    color: #9c5932;\n    position: absolute;\n    left: -2.5em;\n    font-size: 1em;\n    top: 0;\n  }\n  \/* Setinha \u25ba antes dos t\u00edtulos *\/\n  .minerais-content .with-arrow::before {\n    content: \"\u25ba\";\n    color: #9c5932;\n    margin-right: 0.4em;\n  }\n  \/* Texto preto e tamanhos *\/\n  .minerais-content p,\n  .minerais-content span,\n  .minerais-content strong,\n  .minerais-content ul,\n  .minerais-content li,\n  .minerais-content td {\n    color: black !important;\n    font-size: 0.95em;\n  }\n  \/* Tabela com espa\u00e7amento interno m\u00ednimo e bordas #9c5932 *\/\n  .minerais-content table.property-table {\n    width: 100%;\n    border-collapse: collapse;\n    margin-bottom: 2em;\n    border: 1.5px solid #9c5932;\n  }\n  .minerais-content table.property-table td {\n    vertical-align: middle;\n    padding: 0.05em 0.1em;\n    text-align: justify;\n    border: 1px solid #9c5932;\n  }\n  .minerais-content table.property-table td:first-child {\n    font-weight: bold;\n    white-space: nowrap;\n    color: black;\n    position: relative;\n    text-align: left;\n  }\n  .minerais-content table.property-table \ntd:first-child::before {\n    content: \"\u25ba\";\n    color: #9c5932;\n    margin-right: 0.4em;\n  }\n  .minerais-content hr.custom-divider {\n    border: none;\n    border-top: 3px solid #9c5932;\n    margin: 2em 0;\n  }\n<\/style>\n\n\n\n<hr class=\"custom-divider\">\n\n<p style=\"font-style: italic; margin-bottom: 1em;\">\n  Frequentemente associada \u00e0 tantalita, formando a s\u00e9rie columbita\u2013tantalita, conhecida comercialmente como coltan\n<\/p>\n\n<table class=\"property-table\">\n  <tr>\n    <td>Classe<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>\u00d3xidos<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Grupo<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Columbita\u2013Tantalita<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Composi\u00e7\u00e3o Qu\u00edmica<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>(Fe,Mn)(Nb,Ta)\u2082O\u2086<br>\n          <span style=\"font-size: 0.9em;\">(\u00f3xido de ferro, mangan\u00eas, ni\u00f3bio e t\u00e2ntalo)<\/span>\n        <\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Sistema Cristalino<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Ortorr\u00f4mbico<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>H\u00e1bito<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Cristais tabulares a prism\u00e1ticos, geralmente alongados<\/li>\n        <li>Tamb\u00e9m em massas granulares ou compactas<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Cor<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Preto a preto-acastanhado<\/li>\n        <li>\u00c0s vezes com tons vermelhos ou marrons<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Brilho<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Submet\u00e1lico a resinoso<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Dureza (Mohs)<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>6 \u2013 6,5<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Densidade Relativa<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>5,2 \u2013 7,3 (dependendo do teor em t\u00e2ntalo)<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Clivagem<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Imperfeita<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Fratura<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Subconchoidal a irregular<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n<\/table>\n\n\n\n<hr class=\"custom-divider\">\n\n<p style=\"margin-bottom: 1.3em;\">\n  <strong class=\"with-arrow\" style=\"font-size: 1.1em; display: inline;\">Origem<\/strong>\n  <span>\n    Mineral t\u00edpico de pegmatitos gran\u00edticos ricos em elementos raros, frequentemente associado a minerais de l\u00edtio (espodum\u00eanio, lepidolita), turmalina, berilo e cassiterita. Tamb\u00e9m ocorre em dep\u00f3sitos secund\u00e1rios aluvionares devido \u00e0 sua alta densidade e resist\u00eancia ao intemperismo.\n  <\/span>\n<\/p>\n\n<p class=\"with-arrow\" style=\"margin-bottom: 0.8em; font-size: 1.1em; font-weight: bold; display: block;\">Usos<\/p>\n<ul class=\"custom-square\" style=\"line-height: 1.8;\">\n  <li><strong>Industrial<\/strong> \u2013 Fonte prim\u00e1ria de ni\u00f3bio (usado em ligas met\u00e1licas de alta resist\u00eancia, a\u00e7os especiais e supercondutores) e de t\u00e2ntalo (essencial para capacitores eletr\u00f4nicos, ligas resistentes ao calor e aplica\u00e7\u00f5es aeroespaciais).<\/li>\n  <li><strong>Cient\u00edfico<\/strong> \u2013 Importante para estudos de petrog\u00eanese de pegmatitos e prospec\u00e7\u00e3o de minerais estrat\u00e9gicos.<\/li>\n  <li><strong>Gemol\u00f3gico<\/strong> \u2013 N\u00e3o utilizada como gema devido \u00e0 cor escura e opacidade.<\/li>\n  <li><strong>Outros<\/strong> \u2013 Mineral estrat\u00e9gico para ind\u00fastrias de alta tecnologia e setor energ\u00e9tico.<\/li>\n<\/ul>\n\n<p class=\"with-arrow\" style=\"margin-bottom: 0.8em; font-size: 1.1em; font-weight: bold; display: block;\">Localiza\u00e7\u00f5es T\u00edpicas<\/p>\n<ul class=\"custom-square\" style=\"line-height: 1.8;\">\n  <li><strong>Brasil<\/strong> \u2013 Minas Gerais (Arax\u00e1, Itinga, Ara\u00e7ua\u00ed), Goi\u00e1s, Rond\u00f4nia<\/li>\n  <li><strong>Nig\u00e9ria<\/strong> \u2013 Diversos dep\u00f3sitos em pegmatitos e placeres<\/li>\n  <li><strong>Rep\u00fablica Democr\u00e1tica do Congo<\/strong> \u2013 Importante fonte de coltan<\/li>\n  <li><strong>Mo\u00e7ambique<\/strong> \u2013 Dep\u00f3sitos pegmat\u00edticos<\/li>\n  <li><strong>Canad\u00e1<\/strong> \u2013 Prov\u00edncia de Manitoba<\/li>\n  <li><strong>Estados Unidos<\/strong> \u2013 Dakota do Sul, Virg\u00ednia<\/li>\n<\/ul>\n\n<hr class=\"custom-divider\">\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-id=\"1951\" src=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-1024x1024.png\" alt=\"\" class=\"wp-image-1951\" srcset=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-1024x1024.png 1024w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-300x300.png 300w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-150x150.png 150w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-768x768.png 768w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-200x200.png 200w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita-70x70.png 70w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/08\/Columbita.png 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Columbita &#8211; MRM UFRRJ<\/figcaption><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A columbita (Fe,Mn)(Nb,Ta)2O6(Fe,Mn)(Nb,Ta)_2O_6(Fe,Mn)(Nb,Ta)2\u200bO6\u200b \u00e9 um \u00f3xido do grupo columbita\u2013tantalita que cristaliza no sistema ortorr\u00f4mbico, formando cristais tabulares a prism\u00e1ticos, geralmente alongados, al\u00e9m [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[45,35],"tags":[],"class_list":["post-1950","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hidroxidos","category-oxidos"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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