{"id":5702,"date":"2024-12-06T21:27:08","date_gmt":"2024-12-06T19:27:08","guid":{"rendered":"http:\/\/www.e-gems.cz\/?post_type=kamen&#038;p=5702"},"modified":"2025-03-21T13:50:18","modified_gmt":"2025-03-21T11:50:18","slug":"whewellit","status":"publish","type":"kamen","link":"https:\/\/www.e-gems.cz\/en\/kamen\/whewellit\/","title":{"rendered":"Whewellit"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Historie<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Whewellit je extr\u00e9mn\u011b vz\u00e1cn\u00fd a extr\u00e9mn\u011b t\u011b\u017ece brousiteln\u00fd drah\u00fd k\u00e1men, proto m\u00e1 pouze sb\u011bratelsk\u00e9 vyu\u017eit\u00ed a ve \u0161perku je zcela vylou\u010den\u00e9 se s&nbsp;n\u00edm setkat. Jedny ze sv\u011btov\u011b nejlep\u0161\u00edch whewellit\u016f se v&nbsp;ned\u00e1vn\u00e9 minulosti nal\u00e9zaly v uheln\u00fdch p\u00e1nv\u00edch severoz\u00e1padu \u010cesk\u00e9 republiky.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vlastnosti<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Whewellit je monoklinick\u00fd oxal\u00e1t v\u00e1pn\u00edku (CaC<sub>2<\/sub>O<sub>4<\/sub>\u2022H<sub>2<\/sub>O) s&nbsp;tvrdost\u00ed pouze 2\u00bd\u20133.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Geneze<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Whewellity se nej\u010dast\u011bji vyskytovaly v&nbsp;dutin\u00e1ch pelosideritov\u00fdch konkrec\u00ed v pelitick\u00fdch sedimentech v bl\u00edzkosti uheln\u00fdch sloj\u00ed. Whewellit se tvo\u0159il po sedimentaci (tj. b\u011bhem diageneze) v puklin\u00e1ch a dutin\u00e1ch, kde krystalizovaly r\u016fzn\u00e9 miner\u00e1ly ze zbytkov\u00fdch tekutin, a tak\u00e9 uvnit\u0159 konkrec\u00ed b\u011bhem z\u00e1v\u011bre\u010dn\u00fdch f\u00e1z\u00ed diageneze. Jeho krystaly jsou \u010dasto myln\u011b pova\u017eov\u00e1ny za kalcit nebo jin\u00e9 karbon\u00e1ty, kter\u00e9 vykazuj\u00ed nepravideln\u00fd r\u016fst krystal\u016f. Krystaly whewellitu obvykle nep\u0159esahuj\u00ed 2 cm, i kdy\u017e vz\u00e1cn\u011b byly nalezeny exempl\u00e1\u0159e o velikosti a\u017e 4 cm. P\u0159\u00edtomnost dickitu sni\u017euje pr\u016fhlednost krystal\u016f a dod\u00e1v\u00e1 jim \u0161edou barvu. P\u0159irozen\u00e1 k\u0159ehkost a n\u00edzk\u00e1 tvrdost zp\u016fsobovala u whewellitu zna\u010dn\u00e9 probl\u00e9my p\u0159i fasetov\u00e9m brou\u0161en\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00fdskyt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Prvn\u00ed vzorky whewellitu na severoz\u00e1pad\u011b \u010cR byly objeveny v roce 1897 p\u0159i v\u00fdkopov\u00fdch prac\u00edch na dole Venu\u0161e v&nbsp;Konobr\u017e\u00edch u Mostu. \u0160edob\u00edl\u00e9 vzorky ve form\u011b radi\u00e1ln\u00edch agreg\u00e1t\u016f byly nalezeny v j\u00edlovit\u00fdch vrstv\u00e1ch v hloubce 110\u2013120 m. V\u00fdrazn\u011b kvalitn\u011bj\u0161\u00ed whewellity byly z\u00edsk\u00e1ny po roce 1899 z dolu Julius II v Kopistech (~2 km od dolu Venu\u0161e), men\u0161\u00ed krystaly byly nalezeny po roce 1910 tak\u00e9 v uzav\u0159en\u00e9m dole Guttmann u Mostu, velk\u00e9 mno\u017estv\u00ed \u017elut\u00e9ho whewellitu v agreg\u00e1tech nebo krystalech o velikosti a\u017e 6 mm bylo pak z\u00edsk\u00e1no z konkrec\u00ed na dole B\u00edlina v letech 1987\u20132000. Nejnov\u011bji, v letech 1996\u20132008, byl whewellit ve fasetov\u00e9 kvalit\u011b objeven na dole Le\u017e\u00e1ky v&nbsp;Kopistech. Tato lokalita byla vyt\u011b\u017eena a p\u0159i rekultivaci zatopena jezerem, tak\u017ee nal\u00e9zt zde jak\u00e9koliv dal\u0161\u00ed whewellity je zcela vylou\u010den\u00e9.&nbsp;<\/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\">Whewellit m\u00e1 mezi sb\u011bratelsk\u00fdmi drah\u00fdmi kameny zvl\u00e1\u0161tn\u00ed postaven\u00ed, proto\u017ee vznikl biogenn\u00edmi procesy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Historie Whewellit je extr\u00e9mn\u011b vz\u00e1cn\u00fd a extr\u00e9mn\u011b t\u011b\u017ece brousiteln\u00fd drah\u00fd k\u00e1men, proto m\u00e1 pouze sb\u011bratelsk\u00e9 vyu\u017eit\u00ed a ve \u0161perku je zcela vylou\u010den\u00e9 se s&nbsp;n\u00edm setkat. Jedny ze sv\u011btov\u011b nejlep\u0161\u00edch whewellit\u016f se v&nbsp;ned\u00e1vn\u00e9 minulosti nal\u00e9zaly v uheln\u00fdch p\u00e1nv\u00edch severoz\u00e1padu \u010cesk\u00e9 republiky.&nbsp; Vlastnosti Whewellit je monoklinick\u00fd oxal\u00e1t v\u00e1pn\u00edku (CaC2O4\u2022H2O) s&nbsp;tvrdost\u00ed pouze 2\u00bd\u20133.&nbsp; Geneze Whewellity se nej\u010dast\u011bji vyskytovaly [&hellip;]<\/p>\n","protected":false},"featured_media":7632,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"class_list":["post-5702","kamen","type-kamen","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/kamen\/5702","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\/7632"}],"wp:attachment":[{"href":"https:\/\/www.e-gems.cz\/en\/wp-json\/wp\/v2\/media?parent=5702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}