{"id":5604,"date":"2024-12-04T21:23:44","date_gmt":"2024-12-04T19:23:44","guid":{"rendered":"http:\/\/www.e-gems.cz\/?post_type=kamen&#038;p=5604"},"modified":"2025-03-21T13:52:53","modified_gmt":"2025-03-21T11:52:53","slug":"aragonit","status":"publish","type":"kamen","link":"https:\/\/www.e-gems.cz\/en\/kamen\/aragonit\/","title":{"rendered":"Aragonit"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Historie<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aragonit byl poprv\u00e9 objeven a pops\u00e1n v roce 1797 v obci Molina de Arag\u00f3n ve \u0160pan\u011blsku, po n\u00ed\u017e nese sv\u00e9 jm\u00e9no. Od t\u00e9 doby se na\u0161lo mnoho dal\u0161\u00edch nalezi\u0161\u0165 po cel\u00e9m sv\u011bt\u011b.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vlastnosti<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aragonit m\u016f\u017ee m\u00edt t\u00e9m\u011b\u0159 jakoukoliv barvu, nej\u010dast\u011bji je v\u0161ak \u017elut\u00fd, kr\u00e9mov\u00fd, \u0161ed\u00fd nebo b\u00edl\u00fd. M\u016f\u017ee v\u0161ak b\u00fdt i nap\u0159. modr\u00fd. Tvrdost aragonitu podle Mohsovy stupnice je 3,5 a\u017e 4 a index lomu sv\u011btla m\u00e1 1,530 a\u017e 1,685. Bohu\u017eel m\u00e1 dokonalou \u0161t\u011bpnost, kter\u00e1 zp\u016fsobuje nemal\u00e9 probl\u00e9my p\u0159i brou\u0161en\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aragonit pat\u0159\u00ed mezi polymorfy uhli\u010ditanu v\u00e1penat\u00e9ho (CaCO<sub>3<\/sub>), tud\u00ed\u017e m\u00e1 zcela stejn\u00fd chemick\u00fd vzorec jako kalcit, ale jinou krystalovou soustavu. Zat\u00edmco kalcit krystaluje v&nbsp;trigon\u00e1ln\u00ed soustav\u011b, aragonit krystalizuje v&nbsp;ortorombick\u00e9 (koso\u010dtvere\u010dn\u00e9) soustav\u011b, co\u017e mu d\u00e1v\u00e1 v\u00fdznamn\u011b odli\u0161n\u00e9 fyzik\u00e1ln\u00ed i optick\u00e9 vlastnosti.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Geneze<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aragonit z \u010c\u00ed\u010dova vznikal d\u00edky terci\u00e9rn\u00ed vulkanick\u00e9 \u010dinnosti. B\u011bhem t\u011bchto proces\u016f doch\u00e1zelo k v\u00fdv\u011br\u016fm tepl\u00fdch roztok\u016f bohat\u00fdch na v\u00e1pn\u00edk a oxid uhli\u010dit\u00fd, z nich\u017e aragonit krystalizoval.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vzhledem k tomu, \u017ee aragonit je termodynamicky nestabiln\u00ed p\u0159i b\u011b\u017en\u00fdch teplot\u00e1ch a tlac\u00edch, m\u00e1 tendenci se \u010dasem p\u0159em\u011b\u0148ovat na stabiln\u011bj\u0161\u00ed polymorf, kalcit. Tento proces v\u0161ak prob\u00edh\u00e1 velmi pomalu, co\u017e umo\u017e\u0148uje aragonitu p\u0159etrv\u00e1vat po miliony let v geologick\u00fdch podm\u00ednk\u00e1ch, kter\u00e9 zaji\u0161\u0165uj\u00ed stabiln\u00ed prost\u0159ed\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdskyt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Pravd\u011bpodobn\u011b nejlep\u0161\u00ed lokalitou pro n\u00e1lez krystal\u016f aragonitu na sv\u011bt\u011b je lokalita \u010c\u00ed\u010dov u Ho\u0159ence v&nbsp;\u010cesk\u00e9m st\u0159edoho\u0159\u00ed. Aragonit se v\u0161ak vyskytuje prakticky po cel\u00e9m sv\u011bt\u011b. Ur\u010dit\u011b nepat\u0159\u00ed mezi klasick\u00e9 drah\u00e9 kameny, jako je nap\u0159. rub\u00edn, saf\u00edr \u010di smaragd, je ale jasn\u00fdm p\u0159\u00edkladem sb\u011bratelsk\u00e9ho drah\u00e9ho kamene, kter\u00fd je kv\u016fli sv\u00e9 n\u00edzk\u00e9 tvrdosti a v\u00fdborn\u00e9 \u0161t\u011bpnosti nemo\u017en\u00e9 pou\u017e\u00edt do \u0161perku.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Syntetick\u00e1 v\u00fdroba<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aragonit z \u010c\u00ed\u010dova se ni\u010d\u00edm neimituje, ani se synteticky nevyr\u00e1b\u00ed. Sb\u011bratel\u00e9 ho v\u0161ak mus\u00ed velmi pe\u010dliv\u011b skladovat, aby nedo\u0161lo k&nbsp;jeho po\u0161kr\u00e1b\u00e1n\u00ed nebo k jin\u00e9mu druhu poni\u010den\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Investi\u010dn\u00ed potenci\u00e1l<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Velk\u00e9 brou\u0161en\u00e9 aragonity z&nbsp;\u010c\u00ed\u010dova dosahuj\u00ed na sv\u011btov\u00fdch trz\u00edch skute\u010dn\u011b vysok\u00fdch cen.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Historie Aragonit byl poprv\u00e9 objeven a pops\u00e1n v roce 1797 v obci Molina de Arag\u00f3n ve \u0160pan\u011blsku, po n\u00ed\u017e nese sv\u00e9 jm\u00e9no. Od t\u00e9 doby se na\u0161lo mnoho dal\u0161\u00edch nalezi\u0161\u0165 po cel\u00e9m sv\u011bt\u011b. Vlastnosti Aragonit m\u016f\u017ee m\u00edt t\u00e9m\u011b\u0159 jakoukoliv barvu, nej\u010dast\u011bji je v\u0161ak \u017elut\u00fd, kr\u00e9mov\u00fd, \u0161ed\u00fd nebo b\u00edl\u00fd. M\u016f\u017ee v\u0161ak b\u00fdt i nap\u0159. modr\u00fd. Tvrdost [&hellip;]<\/p>\n","protected":false},"featured_media":7634,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"class_list":["post-5604","kamen","type-kamen","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/kamen\/5604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/kamen"}],"about":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/types\/kamen"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/media\/7634"}],"wp:attachment":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/media?parent=5604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}