{"id":3290,"date":"2017-04-28T11:35:05","date_gmt":"2017-04-28T09:35:05","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesm-jmzafra\/?p=3290"},"modified":"2017-04-28T11:35:05","modified_gmt":"2017-04-28T09:35:05","slug":"gneis","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/blogs\/museu-de-geologia\/gneis\/","title":{"rendered":"GNEIS"},"content":{"rendered":"
NOM\"gneis_bona_2b8\"<\/a><\/strong><\/h6>\n

Ca<\/em> Gneis<\/p>\n

Es<\/em> Gneis<\/p>\n

En<\/em> Gneis<\/p>\n

DESCRIPCI\u00d3 DE LA PE\u00c7A<\/b><\/h6>\n

Es una roca metam\u00f2rfica que es pot formar a partir de<\/span> roques sediment\u00e0ries<\/span>\u00a0(paragneis) o de<\/span> roques plut\u00f2niques<\/span>, com el<\/span> granit<\/span> (ortogneis)\u00a0<\/span>Roca de gra gruixut a mig, amb textura planar grollera (textura gne\u00edsica), que origina un bandejat composicional alternant de capes de minerals clars (feldspat pot\u00e0ssic major del 20%, albita, quars i moscovita) i capes de minerals foscos (biotita, amf\u00edbols , turmalina, andalusita, sillimanita, cordierita, granats, etc.). A simple vista, es reconeix relativament b\u00e9 per l’alternan\u00e7a de bandes clares i fosques o per la pres\u00e8ncia dels anomenats “ulls de gripau”, cristalls de secci\u00f3 ogival de feldspat pot\u00e0ssic. Solen ser molt m\u00e9s compactes i resistents a l’erosi\u00f3 que els esquistos.<\/p>\n

FORMACI\u00d3 DE LA PE\u00c7A<\/strong><\/h6>\n

Roca originada pel metamorfisme regional de grau mitj\u00e0-alt de roques pol\u00edtiques (paragneis) o pel metamorfisme de roques \u00edgnies gran\u00edtiques (ortogneis).<\/p>\n

ANTIGUITAT DE LA ROCA<\/strong><\/h6>\n

Es una roca amb una \u00a0a<\/span>ntiguitat de 109 anys<\/span><\/p>\n

\u00daS DE LA PE\u00c7A<\/strong><\/h6>\n

El gneis es fa servir, sobretot, en la construcci\u00f3, per fer teules, graons i llambordes, i, tradicionalment, per a la ma\u00e7oneria, entre d’altres. \u00c9s una roca amb un esc\u00e0s aprofitament econ\u00f2mic, excepte algunes varietats que s’utilitzen com a roques ornamentals.<\/span><\/p>\n

LLOC D’ORIGEN<\/strong><\/h6>\n

Roca causada pel metamorfisme regional de grau mitj\u00e0-alt de la Pol\u00edtica de roques (paragneis) o per roques \u00edgnies del metamorfisme de granit (Ortogneis). \u00a0<\/span><\/p>\n

PROCED\u00c8NCIA DE LA PE\u00c7A<\/b><\/h6>\n

La pe\u00e7a va arribar a l\u2019institut gracies a l\u2019Escola Dovella que ens va donar les roques a l\u2019IES Juan Manuel Zafra \u00a0per poder compartir aquestes roques a la resta de l\u2019alumnats de aquest centre.<\/span>
\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

NOM Ca Gneis Es Gneis En Gneis DESCRIPCI\u00d3 DE LA PE\u00c7A Es una roca metam\u00f2rfica que es pot formar a partir de roques sediment\u00e0ries\u00a0(paragneis) o de roques plut\u00f2niques, com el granit (ortogneis)\u00a0Roca de gra gruixut a mig, amb textura planar grollera (textura gne\u00edsica), que origina un bandejat composicional alternant de capes de minerals clars (feldspat […]<\/p>\n","protected":false},"author":112,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[321],"tags":[354,351],"class_list":["post-3290","post","type-post","status-publish","format-standard","hentry","category-museu-de-geologia","tag-2b8","tag-sedimentaries"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/users\/112"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/comments?post=3290"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3290\/revisions"}],"predecessor-version":[{"id":3901,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3290\/revisions\/3901"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media?parent=3290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/categories?post=3290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/tags?post=3290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}