{"id":2103,"date":"2025-09-05T13:05:36","date_gmt":"2025-09-05T16:05:36","guid":{"rendered":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/?p=2103"},"modified":"2025-09-05T13:05:37","modified_gmt":"2025-09-05T16:05:37","slug":"dendritos-de-manganes","status":"publish","type":"post","link":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/dendritos-de-manganes\/","title":{"rendered":"Dendritos de mangan\u00eas"},"content":{"rendered":"\n<p class=\"has-black-color has-text-color has-medium-font-size\">Os dendritos de mangan\u00eas s\u00e3o forma\u00e7\u00f5es de \u00f3xidos de mangan\u00eas, principalmente MnO\u2082, geralmente pirolusita ou polianita, cristalizando no sistema tetragonal, mas sem formas cristalinas definidas. Desenvolvem-se em padr\u00f5es ramificados semelhantes a galhos sobre fraturas e superf\u00edcies de rochas. Apresentam cor preta a negro, brilho submet\u00e1lico a terroso, dureza 2\u20136, densidade relativa 3,5\u20135,0, fratura irregular e clivagem ausente ou imperfeita. Formam-se por precipita\u00e7\u00e3o qu\u00edmica de solu\u00e7\u00f5es ricas em mangan\u00eas, sendo estruturas de crescimento mineral e n\u00e3o f\u00f3sseis vegetais. Embora n\u00e3o sejam explorados como min\u00e9rio, s\u00e3o indicadores de circula\u00e7\u00e3o de fluidos hidrotermais e muito valorizados como inclus\u00f5es ornamentais em quartzo, calcita e \u00e1gata. Ocorrem no Brasil (Minas Gerais, Bahia, Goi\u00e1s), Alemanha (Solnhofen), Fran\u00e7a (Auvergne), Estados Unidos (Utah, Nova Jersey) e China (Yunnan, Guangxi).<\/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 (geralmente pirolusita, polianita ou outros \u00f3xidos hidratados de Mn)<\/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>Principalmente MnO\u2082 \u2013 \u00f3xido de mangan\u00eas (IV), podendo conter misturas com outros \u00f3xidos hidratados de mangan\u00eas<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Sistema Cristalino<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Tetragonal (quando pirolusita\/polianita predominam), mas os dendritos muitas vezes n\u00e3o apresentam forma cristalina bem definida<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>H\u00e1bito<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Forma\u00e7\u00f5es em ramifica\u00e7\u00f5es dendr\u00edticas (semelhantes a galhos ou samambaias), recobrindo superf\u00edcies de rochas, fraturas e planos de clivagem<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Cor<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Preto a negro, \u00e0s vezes cinza-escuro<\/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 terroso<\/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 6 (dependendo do \u00f3xido predominante)<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Densidade Relativa<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>3,5 \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>Ausente ou 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    Formam-se por precipita\u00e7\u00e3o qu\u00edmica de \u00f3xidos de mangan\u00eas a partir de solu\u00e7\u00f5es hidrotermais ou \u00e1guas ricas em Mn, que infiltram fraturas e superf\u00edcies de rochas. S\u00e3o estruturas de crescimento qu\u00edmico, e n\u00e3o f\u00f3sseis de plantas (apesar da semelhan\u00e7a visual).\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 N\u00e3o s\u00e3o explorados diretamente como min\u00e9rio, mas indicam presen\u00e7a de mangan\u00eas na regi\u00e3o.<\/li>\n  <li><strong>Cient\u00edfico<\/strong> \u2013 Importantes como indicadores de circula\u00e7\u00e3o de fluidos ricos em mangan\u00eas; estudados em geoqu\u00edmica e mineralogia.<\/li>\n  <li><strong>Gemol\u00f3gico<\/strong> \u2013 Muito apreciados como inclus\u00f5es ornamentais em pedras como \u00e1gata, calcita e quartzo, valorizados pela est\u00e9tica dendr\u00edtica.<\/li>\n  <li><strong>Outros<\/strong> \u2013 Utilizados em pe\u00e7as lapidadas e placas ornamentais devido ao belo padr\u00e3o natural.<\/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, Bahia, Goi\u00e1s (dendritos em quartzo e calcita)<\/li>\n  <li><strong>Alemanha<\/strong> \u2013 Solnhofen (calc\u00e1rios litogr\u00e1ficos com dendritos famosos)<\/li>\n  <li><strong>Fran\u00e7a<\/strong> \u2013 Auvergne<\/li>\n  <li><strong>Estados Unidos<\/strong> \u2013 Utah, Nova Jersey<\/li>\n  <li><strong>China<\/strong> \u2013 Yunnan, Guangxi<\/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\/Dentrito-de-Manganes.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-id=\"2104\" src=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-1024x1024.png\" alt=\"\" class=\"wp-image-2104\" srcset=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-1024x1024.png 1024w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-300x300.png 300w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-150x150.png 150w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-768x768.png 768w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-200x200.png 200w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes-70x70.png 70w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/09\/Dentrito-de-Manganes.png 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">Dendritos de mangan\u00eas &#8211; UFRRJ<\/figcaption><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Os dendritos de mangan\u00eas s\u00e3o forma\u00e7\u00f5es de \u00f3xidos de mangan\u00eas, principalmente MnO\u2082, geralmente pirolusita ou polianita, cristalizando no sistema tetragonal, mas sem [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2104,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[35],"tags":[],"class_list":["post-2103","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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