{"id":5618,"date":"2024-12-04T21:54:03","date_gmt":"2024-12-04T19:54:03","guid":{"rendered":"http:\/\/www.e-gems.cz\/?post_type=kamen&#038;p=5618"},"modified":"2025-03-21T13:26:04","modified_gmt":"2025-03-21T11:26:04","slug":"eudialit","status":"publish","type":"kamen","link":"https:\/\/www.e-gems.cz\/en\/kamen\/eudialit\/","title":{"rendered":"Eudialit"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Historie<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e1zev eudialitu poch\u00e1z\u00ed z \u0159eck\u00e9ho v\u00fdrazu <em>\u0395\u1f56 \u03b4\u03b9\u03ac\u03bb\u03c5\u03c4\u03bf\u03c2, eu dialytos<\/em>, co\u017e znamen\u00e1 dob\u0159e rozlo\u017eiteln\u00fd. Jeho n\u00e1zev odkazuje na jeho snadnou rozpustnost v kyselin\u011b.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vlastnosti<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Eudialit je krvav\u011b \u010derven\u00fd velmi vz\u00e1cn\u00fd silik\u00e1t zirkonia, v\u00e1pn\u00edku, sod\u00edku a \u017eeleza se slo\u017eit\u00fdm chemick\u00fdm vzorcem Na<sub>15<\/sub>Ca<sub>6<\/sub>(Fe,Mn)<sub>3<\/sub>Zr<sub>3<\/sub>Si(Si<sub>25<\/sub>O<sub>73<\/sub>)(O,OH,H<sub>2<\/sub>O)<sub>3<\/sub>(OH,Cl)<sub>2<\/sub>. Zaj\u00edmavost\u00ed eudialitu je, \u017ee obsahuje rovn\u011b\u017e nezanedbateln\u00e9 mno\u017estv\u00ed prvk\u016f vz\u00e1cn\u00fdch zemin (REE). V&nbsp;p\u0159\u00edrod\u011b se vyskytuje v&nbsp;hn\u011bd\u00e9 a\u017e rezav\u011b \u010derven\u00e9, nep\u0159\u00edli\u0161 vzhledn\u00e9 barv\u011b. V&nbsp;klenotnictv\u00ed se omezen\u011b vyu\u017e\u00edvaj\u00ed pouze ji\u017e zm\u00edn\u011bn\u00e9 krvav\u011b \u010derven\u00e9 kusy. Podle Mohsovy stupnice je tvrdost eudialitu 5,5. Brous\u00ed se z n\u011bj pouze kabo\u0161ony a n\u011bkdy je t\u0159eba jej rovn\u011b\u017e podlepit \u010dernou kompaktn\u00ed desti\u010dkou, aby se zv\u00fd\u0161ila pevnost cel\u00e9ho kabo\u0161onu, proto\u017ee jeho struktura je nej\u010dast\u011bji tvo\u0159ena z&nbsp;2\u20134 mm velk\u00fdch navz\u00e1jem srostl\u00fdch krystal\u016f, kter\u00e9 jsou k tomu prorostl\u00e9 i s&nbsp;\u010dern\u00fdm egir\u00ednem, \u0161ed\u00fdm nefel\u00ednem a sko\u0159icov\u011b hn\u011bd\u00fdm titanitem.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdskyt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00fdskyt eudialitu je v\u00e1z\u00e1n na alkalick\u00e9 vyv\u0159el\u00e9 horniny, jako jsou nefelinick\u00e9 syenity. Tyto horniny jsou unik\u00e1tn\u00ed t\u00edm, \u017ee se v&nbsp;nich v\u016fbec nevyskytuje k\u0159emen, p\u0159itom k\u0159emen je zcela nejb\u011b\u017en\u011bj\u0161\u00ed miner\u00e1l na sv\u011bt\u011b. Eudialit byl poprv\u00e9 pops\u00e1n v roce 1819 z nefelinick\u00e9ho syenitu intruzivn\u00edho komplexu Ilimaussaq, Kangerluarsuk Fjord, Kujalleq v jihoz\u00e1padn\u00edm Gr\u00f3nsku. D\u00e1le se s&nbsp;n\u00edm lze setkat v&nbsp;Norsku, v&nbsp;lomu Poudrette Mont Saint-Hillaire, La Vall\u00e9e Richelieu RCM, Mont\u00e9r\u00e9gie, Qu\u00e9becu v&nbsp;Kanad\u011b, Pocos de Caldas&nbsp;(st\u00e1t Minas Gerais) v Braz\u00edlii a d\u00e1le nap\u0159\u00edklad v&nbsp;Arkansasu v USA. Zdaleka sv\u011btov\u011b nejlep\u0161\u00ed eudiality poch\u00e1zej\u00ed z&nbsp;poloostrova Kola v&nbsp;Rusku na hranic\u00edch s&nbsp;Finskem, z&nbsp;lokalit v&nbsp;Chibinsk\u00e9m (Rasvumtchorr a Putelichorr, Murmansk\u00e1 oblast) a Lovozersk\u00e9m masivu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Extr\u00e9mn\u011b vz\u00e1cn\u011b se m\u016f\u017eeme setkat na trhu rovn\u011b\u017e s&nbsp;fasetovan\u00fdmi polopr\u016fhledn\u00fdmi nebo zcela pr\u016fhledn\u00fdmi eudiality. Ty jsou skute\u010dn\u011b velmi, velmi vz\u00e1cn\u00e9, ani ne tak svou finan\u010dn\u00ed hodnotou, ale svou raritnost\u00ed v&nbsp;p\u0159\u00edrod\u011b. Okolo roku 1970 se nal\u00e9zaly velmi kvalitn\u00ed eudiality v&nbsp;permafrostu (v\u011b\u010dn\u011b zmrzl\u00e9 p\u016fd\u011b) v&nbsp;Lovozersk\u00e9m mas\u00edvu. Tyto n\u00e1lezy byly u\u010din\u011bny v&nbsp;r\u00e1mci geologick\u00e9ho pr\u016fzkumu za \u00fa\u010delem vyhled\u00e1v\u00e1n\u00ed radioaktivn\u00edch materi\u00e1l\u016f. Od t\u00e9 doby ji\u017e srovnateln\u011b kameny nikdy nalezeny nebyly.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Historie N\u00e1zev eudialitu poch\u00e1z\u00ed z \u0159eck\u00e9ho v\u00fdrazu \u0395\u1f56 \u03b4\u03b9\u03ac\u03bb\u03c5\u03c4\u03bf\u03c2, eu dialytos, co\u017e znamen\u00e1 dob\u0159e rozlo\u017eiteln\u00fd. Jeho n\u00e1zev odkazuje na jeho snadnou rozpustnost v kyselin\u011b. Vlastnosti Eudialit je krvav\u011b \u010derven\u00fd velmi vz\u00e1cn\u00fd silik\u00e1t zirkonia, v\u00e1pn\u00edku, sod\u00edku a \u017eeleza se slo\u017eit\u00fdm chemick\u00fdm vzorcem Na15Ca6(Fe,Mn)3Zr3Si(Si25O73)(O,OH,H2O)3(OH,Cl)2. Zaj\u00edmavost\u00ed eudialitu je, \u017ee obsahuje rovn\u011b\u017e nezanedbateln\u00e9 mno\u017estv\u00ed prvk\u016f vz\u00e1cn\u00fdch zemin (REE). V&nbsp;p\u0159\u00edrod\u011b [&hellip;]<\/p>\n","protected":false},"featured_media":7622,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"class_list":["post-5618","kamen","type-kamen","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/kamen\/5618","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\/7622"}],"wp:attachment":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/media?parent=5618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}