{"id":13901,"date":"2021-07-22T19:48:29","date_gmt":"2021-07-22T17:48:29","guid":{"rendered":"http:\/\/volcanx.cluster031.hosting.ovh.net\/?post_type=glossary&#038;p=13901"},"modified":"2021-07-26T17:17:13","modified_gmt":"2021-07-26T15:17:13","slug":"obsidienne-fr","status":"publish","type":"glossary","link":"https:\/\/volcanofoundation.org\/fr\/glossary\/obsidienne-fr\/","title":{"rendered":"OBSIDIENNE"},"content":{"rendered":"<p><a class=\"glossary\" title=\"L'obsidienne est un verre volcanique dense, g&eacute;n&eacute;ralement de composition rhyolite et g&eacute;n&eacute;ralement de couleur noire. L'obsidienne se forme dans les coul&eacute;es de lave o&ugrave; la lave se refroidit si rapidement que les cristaux n'ont pas le temps de cro&icirc;tre.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/obsidian.html\">L&rsquo;obsidienne <\/a>est un verre volcanique dense, g&eacute;n&eacute;ralement de composition <a class=\"glossary\" title=\"Le volcanique (ou lave) est caract&eacute;ristique de couleur claire, contient 69 % ou plus de silice et est riche en potassium et en sodium. La rhyolite &agrave; faible teneur en silice contient 69 &agrave; 74% de silice. La rhyolite &agrave; haute teneur en silice contient de 75 &agrave; 80 % de silice. Les rhyolitiques sont visqueuses et ont tendance &agrave; former des coul&eacute;es de lave &eacute;paisses par blocs ou des tas de laveaux abrupts appel&eacute;s laveaux. Les magmas de rhyolite ont tendance &agrave; &eacute;clater de mani&egrave;re explosive, produisant g&eacute;n&eacute;ralement aussi des cendres et des ponces.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/rhyolite.html\">rhyolite <\/a>et g&eacute;n&eacute;ralement de couleur noire. L&rsquo;<a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;OBSIDIENNE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;L&amp;#039;obsidienne est un verre volcanique dense, g&eacute;n&eacute;ralement de composition rhyolite et g&eacute;n&eacute;ralement de couleur noire. L&amp;#039;obsidienne se forme dans les coul&eacute;es de lave o&ugrave; la lave se refroidit si rapidement que les cristaux n&amp;#039;ont pas le temps de cro&icirc;tre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/obsidienne-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">obsidienne<\/a> se forme dans les coul&eacute;es de <a class=\"glossary\" title=\"Terme g&eacute;n&eacute;ral pour magma (roche fondue) qui a &eacute;clat&eacute; &agrave; la surface de la Terre et maintient son int&eacute;grit&eacute; en tant que masse fluide ou visqueuse, plut&ocirc;t que d'exploser en fragments.\" href=\"https:\/\/volcanoes.usgs.gov\/vsc\/glossary\/lava.html\">lave <\/a>o&ugrave; la <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;LAVE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Terme g&eacute;n&eacute;ral d&eacute;signant le magma (roche en fusion) qui a fait &eacute;ruption &agrave; la surface de la Terre et qui conserve son int&eacute;grit&eacute; sous forme de masse fluide ou visqueuse, plut&ocirc;t que d&amp;#039;exploser en fragments.&lt;\/div&gt;\"  href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/lave-fr\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]'  tabindex='0' role='link'>lave<\/a> se refroidit si rapidement que les cristaux n&rsquo;ont pas le temps de cro&icirc;tre.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;<a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;OBSIDIENNE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;L&amp;#039;obsidienne est un verre volcanique dense, g&eacute;n&eacute;ralement de composition rhyolite et g&eacute;n&eacute;ralement de couleur noire. L&amp;#039;obsidienne se forme dans les coul&eacute;es de lave o&ugrave; la lave se refroidit si rapidement que les cristaux n&amp;#039;ont pas le temps de cro&icirc;tre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/obsidienne-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">obsidienne<\/a> est un verre volcanique dense, g&eacute;n&eacute;ralement de composition <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;RHYOLITE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Roche volcanique (ou lave) qui est caract&eacute;ristique de couleur claire, contient 69 % ou plus de silice et est riche en potassium et en sodium. La faible silicarhyolite contient 69 &agrave; 74 % de silice. La rhyolite &agrave; haute teneur en silice contient de 75 &agrave; 80 % de silice. Les laves rhyolitiques sont visqueuses et ont tendance &agrave; former d&amp;#039;&eacute;paisses coul&eacute;es de lave par blocs ou des tas de lave &agrave; flancs abrupts appel&eacute;s d&ocirc;mes de lave. Les magmas de rhyolite ont tendance &agrave; &eacute;clater de mani&egrave;re explosive, produisant g&eacute;n&eacute;ralement &eacute;galement d&amp;#039;abondantes cendres et ponces.&amp;amp;nbsp;&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/rhyolite-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">rhyolite<\/a> et g&eacute;n&eacute;ralement de couleur noire. L&rsquo;<a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;OBSIDIENNE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;L&amp;#039;obsidienne est un verre volcanique dense, g&eacute;n&eacute;ralement de composition rhyolite et g&eacute;n&eacute;ralement de couleur noire. L&amp;#039;obsidienne se forme dans les coul&eacute;es de lave o&ugrave; la lave se refroidit si rapidement que les cristaux n&amp;#039;ont pas le temps de cro&icirc;tre.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/obsidienne-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">obsidienne<\/a> se forme dans les coul&eacute;es de <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;LAVE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Terme g&eacute;n&eacute;ral d&eacute;signant le magma (roche en fusion) qui a fait &eacute;ruption &agrave; la surface de la Terre et qui conserve son int&eacute;grit&eacute; sous forme de masse fluide ou visqueuse, plut&ocirc;t que d&amp;#039;exploser en fragments.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/lave-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">lave<\/a> o&ugrave; la <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"&lt;div class=glossaryItemTitle&gt;LAVE&lt;\/div&gt;&lt;div class=glossaryItemBody&gt;Terme g&eacute;n&eacute;ral d&eacute;signant le magma (roche en fusion) qui a fait &eacute;ruption &agrave; la surface de la Terre et qui conserve son int&eacute;grit&eacute; sous forme de masse fluide ou visqueuse, plut&ocirc;t que d&amp;#039;exploser en fragments.&lt;\/div&gt;\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/lave-fr\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">lave<\/a> se refroidit si rapidement que les cristaux n&rsquo;ont pas le temps de cro&icirc;tre.<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":0,"template":"","meta":{"footnotes":""},"class_list":["post-13901","glossary","type-glossary","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n\t<meta name=\"author\" content=\"Anne Fornier\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/volcanofoundation.org\/fr\/glossary\/obsidienne-fr\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.0.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"fr_FR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"VOLCANO ACTIVE FOUNDATION\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"OBSIDIENNE | VOLCANO ACTIVE FOUNDATION\" \/>\n\t\t<meta property=\"og:url\" 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