{"id":3060,"date":"2017-04-28T11:31:35","date_gmt":"2017-04-28T09:31:35","guid":{"rendered":"http:\/\/agora.xtec.cat\/iesm-jmzafra\/?p=3060"},"modified":"2018-06-07T13:14:21","modified_gmt":"2018-06-07T11:14:21","slug":"ofita-2","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/general\/ofita-2\/","title":{"rendered":"OFITA"},"content":{"rendered":"

Nom:<\/strong>
\nCatal\u00e0: Ofita<\/strong>
\nCastell\u00e0: Ofita
\nAngles: Office
\nFranc\u00e8s: Bureau
\nImatges:<\/strong><\/p>\n

\"Resultado<\/p>\n

Quin tipus i subtipus de roca i\/o mineral \u00e9s?<\/strong>
\nLes ofites s\u00f3n roques \u00edgnies magm\u00e0tiques.<\/p>\n

Formaci\u00f3 de la roca i\/o mineral<\/strong>
\nEl seu origen est\u00e0 relacionat amb la fracturaci\u00f3 i separaci\u00f3 del Pangea durant el Tri\u00e0sic, que va facilitar l’ascens de magmes b\u00e0sics procedents del mantell. En ser roques tan antigues, es conserva fonamentalment el farciment dels conductes d’ascens del magma, encara que s’han preservat algunes colades i emissions submarines. Han patit hidrotermalismo alp\u00ed, de manera que en les seves fractures han cristal\u00b7litzat nombrosos minerals hidrotermals (prehnita, titanita, amf\u00edbols, clorita, epidota, granats, quars, calcita, oligisto especular, etc.). Els afloraments existents a les Zones Internes han patit tamb\u00e9 processos de metamorfisme regional per la qual
\ncosa apareixen sota la denominaci\u00f3 de metabasitas.<\/p>\n

Composici\u00f3 qu\u00edmica<\/strong><\/p>\n

Densitat: 2,1 g \/ cm3.<\/p>\n

Duresa: 5 en l’Escala Mohs.
\nComposici\u00f3 mineral\u00f2gica: pirox\u00e8 (duresa 5,5) i plagi\u00f2clasi (duresa 6)<\/p>\n

Breu descripci\u00f3 (color, textura…)<\/strong>
\nS\u00f3n roques de color fosc, normalment verdes, les superf\u00edcies alterades presenten tonalitats vermelloses pels \u00f2xids de ferro, alliberats en descompondre els minerals ferromagnesianos (piroxens o anf\u00edboles).
\nL’aspecte de la seva superf\u00edcie, quan aquesta est\u00e0 poc alterada recorda a la pell d’alguns r\u00e8ptils per la qual cosa les va batejar amb aquest nom (ofites de ofidi). Alguns ge\u00f2legs a les diabasas solen anomenar com doleritas. La seva textura, s’anomena of\u00edtica, i consisteix a presentar una armadura de cristalls de piroxens que inclouen cristalls tabulars desorientats de plagi\u00f2clasis.<\/p>\n

Usos i\/o aplicacions<\/strong>
\nS’utilitzen com a \u00e0rids per a l’asfalt de carreteres, pavimentaci\u00f3 de vies de ferrocarril, etc.
\nS\u2019utilitza en la fabricaci\u00f3 d’objectes ornamentals.<\/p>\n

Lloc d’origen (Jaciments m\u00e9s importants)<\/strong>
\nUn dels llocs on hi ha m\u00e9s quantitat de ofita es a Murcia a les Mines de Abar\u00e1n.<\/p>\n

Refer\u00e8ncia bibliogr\u00e0fica<\/strong>
\nwww.ecured.cu<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Nom: Catal\u00e0: Ofita Castell\u00e0: Ofita Angles: Office Franc\u00e8s: Bureau Imatges: Quin tipus i subtipus de roca i\/o mineral \u00e9s? Les ofites s\u00f3n roques \u00edgnies magm\u00e0tiques. Formaci\u00f3 de la roca i\/o mineral El seu origen est\u00e0 relacionat amb la fracturaci\u00f3 i separaci\u00f3 del Pangea durant el Tri\u00e0sic, que va facilitar l’ascens de magmes b\u00e0sics procedents del […]<\/p>\n","protected":false},"author":184,"featured_media":3064,"comment_status":"closed","ping_status":"closed","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":[1,321],"tags":[350,322],"class_list":["post-3060","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-museu-de-geologia","tag-2b4","tag-magmatiques"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3060","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\/184"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/comments?post=3060"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3060\/revisions"}],"predecessor-version":[{"id":9953,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/posts\/3060\/revisions\/9953"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media\/3064"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/media?parent=3060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/categories?post=3060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inscaterinaalbert\/wp-json\/wp\/v2\/tags?post=3060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}