{"id":720,"date":"2023-02-22T10:46:09","date_gmt":"2023-02-22T09:46:09","guid":{"rendered":"http:\/\/www.krantz.unipr.it\/?post_type=product&#038;p=720"},"modified":"2023-02-22T10:50:11","modified_gmt":"2023-02-22T09:50:11","slug":"327-riolite-a-feldspati-alcalini","status":"publish","type":"product","link":"http:\/\/www.krantz.unipr.it\/index.php\/prodotto\/327-riolite-a-feldspati-alcalini\/","title":{"rendered":"327- Riolite a feldspati alcalini"},"content":{"rendered":"<p><strong>DESCRIZIONE: <\/strong><\/p>\n<p>La struttura delle rioliti dipende essenzialmente dalla modalit\u00e0 di raffreddamento; se il raffreddamento \u00e8 lento, si former\u00e0 una struttura porfirica; se invece il raffreddamento \u00e8 molto rapito si former\u00e0 una struttura vetrosa oloialina, e si formeranno le ossidiane, le pomici, le perliti o le pitchstone. L\u2019alto contenuto in silice dei magmi riolitici, assieme alla bassa temperatura a cui vengono estrusi, determina un\u2019alta viscosit\u00e0 di questi magmi; per questo motivo le rioliti formano raramente colate, ma tendono ad accumularsi direttamente al di sopra del condotto vulcanico, formando strutture dette duomi.<\/p>\n<p><strong>VISTA A 360\u00b0<\/strong><\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.krantz.unipr.it\/360\/327- Riolite a feldspati alcalini\/327- Riolite a feldspati alcalini.html\" width=\"1100\" height=\"700\"><span style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" data-mce-type=\"bookmark\" class=\"mce_SELRES_start\">\ufeff<\/span><span style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" data-mce-type=\"bookmark\" class=\"mce_SELRES_start\">\ufeff<\/span><span style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" data-mce-type=\"bookmark\" class=\"mce_SELRES_start\">\ufeff<\/span><span style=\"display: inline-block; 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Il termine riolite fu coniato da Ferdinand von Richthofen (meglio noto come il Barone rosso della I guerra mondiale), e deriva dal greco rhyax (scorrere) e lithos (roccia). http:\/\/www.alexstrekeisen.it<\/p>\n<p><b><span data-contrast=\"auto\">Descrizione\u00a0<\/span><\/b><b><span data-contrast=\"auto\">microfoto<\/span><\/b><b><span data-contrast=\"auto\">:<br \/>\n<\/span><\/b><\/p>\n<p><strong>prima immagine: <\/strong>Fenocristallo di quarzo in una riolite. Immagine a NX, 2x (lato lungo = 7mm)<strong><br \/>\n<\/strong><\/p>\n<p><strong>seconda immagine:\u00a0<\/strong>Fenocristallo di sanidino. Immagine a NX, 2x (lato lungo = 7mm)<\/p>\n<p><strong>terza immagine:\u00a0<\/strong>Fenocristallo di quarzo e biotite. Immagine a NX, 2x (lato lungo = 7mm)<\/p>\n<p>http:\/\/www.alexstrekeisen.it<\/p>\n","protected":false},"featured_media":724,"template":"","meta":{"_lmt_disableupdate":"","_lmt_disable":""},"product_cat":[24],"product_tag":[],"class_list":{"0":"post-720","1":"product","2":"type-product","3":"status-publish","6":"product_cat-magmatiche-effusive","8":"first","9":"outofstock","10":"shipping-taxable","11":"product-type-simple"},"_links":{"self":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product\/720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product"}],"about":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/media\/724"}],"wp:attachment":[{"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/media?parent=720"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product_cat?post=720"},{"taxonomy":"product_tag","embeddable":true,"href":"http:\/\/www.krantz.unipr.it\/index.php\/wp-json\/wp\/v2\/product_tag?post=720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}