\u00cen r\u00e2ul Chiang Mai din Thailanda, grana\u0163ii con\u0163in ceva special: \u201etuneluri\u201d foarte sub\u0163iri \u00een structura intern\u0103. De\u015fi acest lucru este un aspect negativ pentru comercian\u0163ii de nestemate, savan\u0163ii sunt fascina\u0163i.<\/p>\n
Recent, o echip\u0103 de cercet\u0103tori suedezi \u015fi thailandezi au publicat un articol \u00een jurnalul PLOS ONE unde detaliaz\u0103 studiul asupra grana\u0163ilor, scrie\u00a0Scientific American<\/a>.<\/p>\n Grana\u0163ii reprezint\u0103 un grup de minerale unde duritatea medie pe scara Mohs este de 7,5 (maximul este 10, duritatea diamantului). De aceea, cercet\u0103torii s-au \u00eentrebat ce for\u0163e au putut provoca aceste tuneluri sub\u0163iri care par s\u0103 sfideze loca\u0163ia lor.<\/p>\n C\u00e2teodat\u0103, acestea sunt aliniate paralel, dar \u00een alte e\u015fantioane, \u201evenele\u201d au o dispunere aleatoare. \u00cen alte situa\u0163ii, acestea sunt rectangulare sau hexagonale, mai ales \u00een zonele din apropierea suprafe\u0163ei. Orientarea acestora este de obicei identic\u0103 \u00een tunelurile adiacente, suger\u00e2nd c\u0103 orientarea este controlat\u0103 de planurile re\u0163elei cristalografice ale\u00a0granatului<\/a>.<\/p>\n Mai exist\u0103 \u015fi alte indicii: fiecare tunel avea o gaur\u0103 de ie\u015fire pe suprafa\u0163a pietrei. Niciunul dintre grana\u0163ii sco\u015fi din roca gazd\u0103 nu con\u0163inea doar un singur tunel, iar c\u00e2teva tuneluri erau umplute cu un material ro\u015fu.<\/p>\n Faptul c\u0103 aceste tuneluri formeaz\u0103 re\u0163ele este sugestiv. Procesul numit anastomoz\u0103 este foarte caracteristic pentru via\u0163\u0103 – pentru anumite tipuri de organisme.<\/p>\n Conform savan\u0163ilor, cele mai mari opera\u0163ii miniere sunt efectuate de fungi. At\u00e2t\u00a0lichenii<\/a>, c\u00e2t \u015fi\u00a0fungii<\/a>micorizali, o clas\u0103 de organisme care tr\u0103ie\u015fte \u00een simbioz\u0103 cu r\u0103d\u0103cinile de plante, pot s\u0103pa \u00een roc\u0103 folosind o combina\u0163ie de acizi organici \u015fi for\u0163\u0103 mecanic\u0103. Ambele tipuri de fungi doresc nutrien\u0163ii minerali, dar \u015fi protec\u0163ie. \u00cen special fierul, care se g\u0103se\u015fte din plin \u00een grana\u0163i, a fost consumat de microorganismele din r\u00e2u.<\/p>\n sursa: descopera.ro<\/p>\n","protected":false},"excerpt":{"rendered":" \u00cen r\u00e2ul Chiang Mai din Thailanda, grana\u0163ii con\u0163in ceva special: \u201etuneluri\u201d foarte sub\u0163iri \u00een structura intern\u0103. De\u015fi acest lucru este<\/p>\n","protected":false},"author":1,"featured_media":41148,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":""},"categories":[12],"tags":[],"class_list":["post-41146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiri-internationale"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/realitatearutiera.ro\/wp-content\/uploads\/2018\/09\/granat-123rf.jpg?fit=618%2C357&ssl=1","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p61naM-aHE","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/41146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=41146"}],"version-history":[{"count":1,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/41146\/revisions"}],"predecessor-version":[{"id":41149,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/posts\/41146\/revisions\/41149"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=\/wp\/v2\/media\/41148"}],"wp:attachment":[{"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=41146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/realitatearutiera.ro\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}