{"id":150,"date":"2024-04-04T06:11:49","date_gmt":"2024-04-04T03:11:49","guid":{"rendered":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/plagioklassid\/"},"modified":"2024-04-04T06:13:01","modified_gmt":"2024-04-04T03:13:01","slug":"plagioklassid","status":"publish","type":"page","link":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/plagioklassid\/","title":{"rendered":"Plagioklassid"},"content":{"rendered":"<p>\n\t<font face=\"Arial\"><font style=\"medium;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none\"><b>Plagioklassid<\/b>\u00a0kujutavad endast\u00a0<\/font><\/font><a data-url=\"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/isomorfism\" href=\"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/isomorfism\" target=\"_blank\" title=\"\" rel=\"noopener\">isomorfseid<\/a><font face=\"Arial\"><font style=\"medium;font-style:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none\">\u00a0segusid, mille \u00e4\u00e4rmisteks l\u00fclideks on puhas naatrium-plagioklass \u2013\u00a0<b>albiit<\/b>\u00a0(Na[Al Si<sub>3=8<\/sub>]) (fotod 1, 2, 3) ja puhas kaltsium-plagioklass \u2013\u00a0<b>anortiit<\/b>\u00a0(Ca[Al<sub>2<\/sub>Si<sub>2<\/sub>O<sub>8<\/sub>]. Naatriumirikkad plagioklassid on tuntud happeliste, kaltsiumirikkad aluseliste, vahepealsed aga keskmiste plagioklassidena (foto 4).<\/font><\/font>\n<\/p>\n<p>\n\t<font face=\"Arial\">Korrap\u00e4rase kujuga plagioklasside kristalle esineb harva, kusjuures nad on tahvelja ja tahveljas-prismalise kujuga. Enamasti esinevad nad tiheda v\u00f5i peenekristallilise agregaadina. V\u00e4rvus on valge, hallikas, roheka v\u00f5i punaka varjundiga. L\u00f5henevus t\u00e4iuslik kahes suunas.<\/font>\n<\/p>\n<p>\n\t<font face=\"Arial\"><b>K\u00f5vadus 6 \u2013 6,5<\/b><\/font>\n<\/p>\n<p>\n\t<font face=\"Arial\">Plagioklassid esinevad sageli k\u00f5rvuti ortoklassiga. Nendest on naatriumirikkad erimid enamasti valged, kaltsiumirikkad \u2013 tumehallid v\u00f5i koguni mustad. Sinise sillerdava l\u00f5henemispinnaga kaltsiumirikast plagioklassi\u00a0<b>labradori<\/b>\u00a0(foto 5) leidub suurte tahveljate v\u00f5i prismaliste kristallidena labradorporfuriitides.\u00a0<\/font><a data-url=\"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/irisatsioon\" href=\"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/irisatsioon\" target=\"_blank\" title=\"\" rel=\"noopener\">Iriseeruvat<\/a><font face=\"Arial\">\u00a0v\u00e4\u00e4risplagioklassi nimetatakse\u00a0<b>spektroliidiks<\/b>\u00a0(foto 6).<\/font>\n<\/p>\n<p>\n\t<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"88\" class=\"alignnone wp-image-436\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/albiit1a.jpg\" title=\"albiit1a.jpg\" alt=\"albiit\">\u00a0<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"90\" class=\"alignnone wp-image-437\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/albiit2a.jpg\" title=\"albiit2a.jpg\" alt=\"albiit\">\u00a0<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"91\" class=\"alignnone wp-image-438\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/albiit3a.jpg\" title=\"albiit3a.jpg\" alt=\"albiit\"><br><font face=\"Arial\">Foto 1, 2, 3. Albiit<\/font>\n<\/p>\n<p>\n\t<img loading=\"lazy\" decoding=\"async\" width=\"107\" height=\"120\" class=\"alignnone wp-image-439\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/ortokl4a.jpg\" title=\"ortokl4a.jpg\" alt=\"andesiin\"><br><font face=\"Arial\">Foto 4. Keskmiste plagioklasside hulka kuuluv andesiin<\/font>\n<\/p>\n<p>\n\t<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"90\" class=\"alignnone wp-image-440\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/labrador1a.jpg\" title=\"labrador1a.jpg\" alt=\"labrador\">\u00a0<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"109\" class=\"alignnone wp-image-441\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/labrador2a.jpg\" title=\"labrador2a.jpg\" alt=\"labrador\"><br><font face=\"Arial\">Foto 5. Labrador<\/font>\n<\/p>\n<p>\n\t<img loading=\"lazy\" decoding=\"async\" width=\"120\" height=\"95\" class=\"alignnone wp-image-442\" src=\"https:\/\/sisu.ut.ee\/wp-content\/uploads\/sites\/431\/spektroliit1a.jpg\" title=\"spektroliit1a.jpg\" alt=\"spektoliit\"><br><font face=\"Arial\">Foto 6. Spektroliit, Yl\u00e4maa, Soome (A. Uutela kingitus)<\/font>\n<\/p>\n<p style=\"text-align:start\">\n\t<br><span><span style=\"color:#000000\"><span><span style=\"font-style:normal\"><span><span><span style=\"font-weight:400\"><span style=\"letter-spacing:normal\"><span><span style=\"text-transform:none\"><span><span><span><span><span>Koostanud ja fotografeerinud \u00a9 2003 Mare Isakar<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Plagioklassid\u00a0kujutavad endast\u00a0isomorfseid\u00a0segusid, mille \u00e4\u00e4rmisteks l\u00fclideks on puhas naatrium-plagioklass \u2013\u00a0albiit\u00a0(Na[Al Si3=8]) (fotod 1, 2, 3) ja puhas kaltsium-plagioklass \u2013\u00a0anortiit\u00a0(Ca[Al2Si2O8]. Naatriumirikkad plagioklassid on tuntud happeliste, kaltsiumirikkad aluseliste, vahepealsed aga keskmiste plagioklassidena (foto 4). Korrap\u00e4rase kujuga plagioklasside kristalle esineb harva, kusjuures nad on &#8230;<\/p>\n","protected":false},"author":226,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-150","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/pages\/150","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/users\/226"}],"replies":[{"embeddable":true,"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/comments?post=150"}],"version-history":[{"count":1,"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/pages\/150\/revisions"}],"predecessor-version":[{"id":692,"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/pages\/150\/revisions\/692"}],"wp:attachment":[{"href":"https:\/\/sisu.ut.ee\/mineraalid-ja-kivimid\/wp-json\/wp\/v2\/media?parent=150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}