{"id":1248,"date":"2025-06-02T10:50:07","date_gmt":"2025-06-02T13:50:07","guid":{"rendered":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/?p=1248"},"modified":"2025-06-09T14:10:30","modified_gmt":"2025-06-09T17:10:30","slug":"actinolita","status":"publish","type":"post","link":"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/actinolita\/","title":{"rendered":"Actinolita (Actinolite)"},"content":{"rendered":"\n<p class=\"has-black-color has-text-color has-medium-font-size\">A actinolita \u00e9 um anfib\u00f3lio rico em ferro e magn\u00e9sio, com h\u00e1bito prism\u00e1tico ou fibroso, t\u00edpico de rochas metam\u00f3rficas como os xistos verdes. Apresenta cor verde caracter\u00edstica, clivagem em \u00e2ngulos de ~56\u00b0 e 124\u00b0, e brilho v\u00edtreo ou sedoso. Suas formas fibrosas foram usadas como asbesto, mas seu uso industrial \u00e9 atualmente restrito. \u00c9 um importante indicador de metamorfismo de baixo a m\u00e9dio grau.<\/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>Composi\u00e7\u00e3o Qu\u00edmica:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Ca\u2082(Mg,Fe)\u2085Si\u2088O\u2082\u2082(OH)\u2082<br>\n          <span style=\"font-size: 0.9em;\">(Silicato complexo de c\u00e1lcio, magn\u00e9sio e ferro \u2013 mesmo grupo qu\u00edmico da tremolita, pertencente aos anfib\u00f3lios.)<\/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>Monocl\u00ednico<\/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<\/li>\n        <li>Fibroso (frequentemente asbestiforme)<\/li>\n        <li>Radial<\/li>\n        <li>Maci\u00e7o<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Cor:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Verde claro a verde escuro (caracter\u00edstica marcante)<\/li>\n        <li>Cinza esverdeado<\/li>\n        <li>Preto esverdeado (em variedades ricas em ferro)<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Brilho:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>V\u00edtreo<\/li>\n        <li>Sedoso (em formas fibrosas)<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Dureza (Mohs):<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>5,5 a 6<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Densidade Relativa:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>3,0 a 3,2<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Clivagem:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Perfeita em duas dire\u00e7\u00f5es, com \u00e2ngulos de aproximadamente 56\u00b0 e 124\u00b0, t\u00edpica dos anfib\u00f3lios<\/li>\n      <\/ul>\n    <\/td>\n  <\/tr>\n  <tr>\n    <td>Fratura:<\/td>\n    <td>\n      <ul class=\"custom-square\">\n        <li>Irregular a fibrosa<\/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    A Actinolita \u00e9 comum em rochas metam\u00f3rficas, especialmente em xistos verdes, formados por metamorfismo de baixo a m\u00e9dio grau. Tamb\u00e9m pode ocorrer em rochas ultram\u00e1ficas metamorfoseadas, m\u00e1rmores dolom\u00edticos e calc\u00e1rios impuros. Forma-se em condi\u00e7\u00f5es semelhantes \u00e0s da tremolita, com maior presen\u00e7a de ferro.\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> As variedades fibrosas da actinolita s\u00e3o consideradas formas de asbesto (anfib\u00f3lio asbestiforme). Assim como a tremolita, seu uso industrial foi severamente restringido devido aos riscos \u00e0 sa\u00fade (inala\u00e7\u00e3o de fibras pode causar doen\u00e7as respirat\u00f3rias graves).<\/li>\n  <li><strong>Cient\u00edfico:<\/strong> Importante na petrologia metam\u00f3rfica como indicador de condi\u00e7\u00f5es P-T (press\u00e3o e temperatura) em xistos verdes e outras rochas metam\u00f3rficas.<\/li>\n  <li><strong>Colecionismo:<\/strong> Cristais alongados e agregados radiados ou fibrosos s\u00e3o valorizados por sua cor verde vibrante.<\/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>It\u00e1lia<\/strong> \u2013 Regi\u00e3o alpina e Piemonte<\/li>\n  <li><strong>Estados Unidos<\/strong> \u2013 Calif\u00f3rnia, Montana, Nova York<\/li>\n  <li><strong>Canad\u00e1<\/strong> \u2013 Col\u00fambia Brit\u00e2nica<\/li>\n  <li><strong>Brasil<\/strong> \u2013 Encontrada em Minas Gerais, especialmente em regi\u00f5es com rochas metam\u00f3rficas ultram\u00e1ficas e carbon\u00e1ticas<\/li>\n<\/ul>\n\n<hr class=\"custom-divider\">\n<\/div>\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\/06\/Actinolita-2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-id=\"1264\" src=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-1024x1024.png\" alt=\"\" class=\"wp-image-1264\" srcset=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-1024x1024.png 1024w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-300x300.png 300w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-150x150.png 150w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-768x768.png 768w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-200x200.png 200w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2-70x70.png 70w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-2.png 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita.png\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" data-id=\"1265\" src=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-1024x1024.png\" alt=\"\" class=\"wp-image-1265\" srcset=\"https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-1024x1024.png 1024w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-300x300.png 300w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-150x150.png 150w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-768x768.png 768w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-200x200.png 200w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita-70x70.png 70w, https:\/\/laboratorios.ufrrj.br\/mineraiserochas\/wp-content\/uploads\/sites\/2\/2025\/06\/Actinolita.png 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A actinolita \u00e9 um anfib\u00f3lio rico em ferro e magn\u00e9sio, com h\u00e1bito prism\u00e1tico ou fibroso, t\u00edpico de rochas metam\u00f3rficas como os xistos [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1264,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41],"tags":[],"class_list":["post-1248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-inossilicatos"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - 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