{"id":2079,"date":"2025-09-02T15:46:29","date_gmt":"2025-09-02T18:46:29","guid":{"rendered":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/?p=2079"},"modified":"2025-09-02T15:47:30","modified_gmt":"2025-09-02T18:47:30","slug":"polianita","status":"publish","type":"post","link":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/polianita\/","title":{"rendered":"Polianita"},"content":{"rendered":"\n<p class=\"has-black-color has-text-color has-medium-font-size\">A polianita MnO\u2082 \u00e9 um \u00f3xido de mangan\u00eas (IV) do grupo \u00f3xidos de mangan\u00eas que cristaliza no sistema tetragonal, formando cristais prism\u00e1ticos alongados, finos e aciculares, al\u00e9m de massas botrioidais e terrosas. Apresenta cor cinza escuro a preto, brilho met\u00e1lico a submet\u00e1lico, dureza 2\u20132,5, densidade relativa 4,7\u20135,0, fratura irregular e clivagem imperfeita. \u00c9 um mineral secund\u00e1rio de mangan\u00eas, formado em dep\u00f3sitos hidrotermais ou como produto de altera\u00e7\u00e3o de minerais de mangan\u00eas prim\u00e1rios, frequentemente associada a pirolusita, hausmannita e manganita. \u00c9 usada industrialmente como fonte de mangan\u00eas em ligas met\u00e1licas, a\u00e7o, pilhas secas e produtos qu\u00edmicos. Cristais bem formados s\u00e3o apreciados em cole\u00e7\u00f5es mineral\u00f3gicas. Ocorre no Brasil (Minas Gerais), Zimb\u00e1bue, \u00c1frica do Sul, Austr\u00e1lia, Estados Unidos e R\u00fassia.<\/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<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>\u00d3xidos de mangan\u00eas<\/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>MnO\u2082<br>\n          <span style=\"font-size: 0.9em;\">(\u00f3xido de mangan\u00eas IV)<\/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>Tetragonal<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>H\u00e1bito<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Cristais prism\u00e1ticos alongados, finos e aciculares<\/li>\n        <li>Massas botrioidais e terrosas<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Cor<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Cinza escuro a preto<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Brilho<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Met\u00e1lico a submet\u00e1lico<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Dureza (Mohs)<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>2 \u2013 2,5<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Densidade Relativa<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>4,7 \u2013 5,0<\/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>Irregular<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n<\/table>\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 secund\u00e1rio de mangan\u00eas, formado em dep\u00f3sitos hidrotermais ou como produto de altera\u00e7\u00e3o de minerais prim\u00e1rios de mangan\u00eas. Frequentemente associada \u00e0 pirolusita, hausmannita e manganita.\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 de mangan\u00eas, utilizada em ligas met\u00e1licas, a\u00e7o, pilhas secas e produtos qu\u00edmicos.<\/li>\n  <li><strong>Cient\u00edfico<\/strong> \u2013 Relevante para estudos de mineralogia de mangan\u00eas e processos de oxida\u00e7\u00e3o.<\/li>\n  <li><strong>Gemol\u00f3gico<\/strong> \u2013 Cristais raramente usados como gemas; mais valorizados por colecionadores.<\/li>\n  <li><strong>Outros<\/strong> \u2013 Mineral estrat\u00e9gico em dep\u00f3sitos de mangan\u00eas e indicador de processos hidrotermais e metam\u00f3rficos.<\/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 (Serra do Navio, Itabira)<\/li>\n  <li><strong>Zimb\u00e1bue<\/strong> \u2013 Dep\u00f3sitos de mangan\u00eas hidrotermal<\/li>\n  <li><strong>\u00c1frica do Sul<\/strong> \u2013 Kalahari<\/li>\n  <li><strong>Austr\u00e1lia<\/strong> \u2013 Queensland, Broken Hill<\/li>\n  <li><strong>Estados Unidos<\/strong> \u2013 Nova Jersey, Missouri<\/li>\n  <li><strong>R\u00fassia<\/strong> \u2013 Montes Urais<\/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\/09\/Polianita.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-id=\"2080\" src=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-1024x1024.png\" alt=\"\" class=\"wp-image-2080\" srcset=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-1024x1024.png 1024w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-300x300.png 300w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-150x150.png 150w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-768x768.png 768w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-200x200.png 200w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita-70x70.png 70w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Polianita.png 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Polianita &#8211; MRM UFRRJ<\/figcaption><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Polianita &#8211; MRM UFRRJ<\/p>\n","protected":false},"author":2,"featured_media":2080,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-2079","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oxidos"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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