{"id":164,"date":"2021-05-18T11:14:50","date_gmt":"2021-05-18T09:14:50","guid":{"rendered":"https:\/\/foldvikbutikken.no\/park\/?post_type=activities&#038;p=164"},"modified":"2024-03-04T15:55:18","modified_gmt":"2024-03-04T14:55:18","slug":"foffas-edelstensgruve","status":"publish","type":"activities","link":"https:\/\/foldvik.no\/aktiviteter\/foffas-edelstensgruve\/","title":{"rendered":"Foffas Edelstensgruve"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"268\" src=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2023\/08\/Hoysesong-10-18-e1691325538162-1024x268.jpg\" alt=\"\" class=\"wp-image-3377\" srcset=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2023\/08\/Hoysesong-10-18-e1691325538162-1024x268.jpg 1024w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2023\/08\/Hoysesong-10-18-e1691325538162-300x79.jpg 300w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2023\/08\/Hoysesong-10-18-e1691325538162-768x201.jpg 768w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2023\/08\/Hoysesong-10-18-e1691325538162.jpg 1050w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Visste du at Foffa har sin egen edelstensgruve her p\u00e5 Foldvik? I den er det flotte edelstener som safir, rubin og opal. Her vil du f\u00e5 utdelt sand fra edelstensgruva som du vasker i vannrennene. Kanskje du finner en edelsten eller to? <\/p>\n\n\n\n<p>Har du forresten h\u00f8rt sagnet om Edelstensgruva? Den spennende historien kan du lese <a href=\"https:\/\/foldvik.no\/sagnet\/\">her<\/a>. <\/p>\n\n\n\n<p>Er du riktig heldig s\u00e5 kanskje du finner Norges nasjonalbergart: Larvikitt.<\/p>\n\n\n\n<p>Larvikitt er over 300 millioner \u00e5r gammel og finnes kun i Larviksomr\u00e5det. <\/p>\n\n\n\n<p>Nesten 90 prosent av larvikitten best\u00e5r av feltspat, og krystallene er sammensatt p\u00e5 en slik m\u00e5te at det fremkommer et bl\u00e5tt fargespill n\u00e5r lyset brytes i \u00f8rsm\u00e5 lameller internt i dem.<\/p>\n\n\n\n<p>Dette optiske fenomenet kaller vi gjerne for &laquo;iridescens&raquo; eller &laquo;Schiller-effekt&raquo;. Det er den helt spesielle sammensetningen av feltspaten som er \u00e5rsaken til dette. N\u00e5r vi legger en larvikittpr\u00f8ve under elektronmikroskopet kan vi se disse lamellene tydelig. Fargespillet fremkommer bare der hvor de er spesielt tett, mens vi ikke f\u00e5r det der hvor det er st\u00f8rre avstand mellom dem.<\/p>\n\n\n\n<p>I tillegg til feltspat inneholder larvikitten sm\u00e5 mengder m\u00f8rke mineraler, slik som amfibol, olivin og biotitt, og de mest attraktive variantene f\u00f8rer sm\u00e5 mengder av mineralet nefelin. I moderne geologisk nomenklatur klassifiserer larvikitten som monzonitt, men selv i dag er den gamle termen, gitt av geologen Waldemar Br\u00f8gger i 1890, gangbar og hyppig benyttet ogs\u00e5 internasjonalt. kilde: <a href=\"https:\/\/vestfoldgeologi.no\/Bilder\/kart\/larvikitt.html?fbclid=IwAR2LPAyyfBijECc9PKrwm8aDYcrIBPxTEnN8qtFPDlP7Rqhfw7f6RZ92tUE\" target=\"_blank\" rel=\"noreferrer noopener\">Vestfold Geologiforening<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1-1024x683.jpg\" alt=\"\" class=\"wp-image-973\" srcset=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1-1024x683.jpg 1024w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1-300x200.jpg 300w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1-768x512.jpg 768w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1-1536x1024.jpg 1536w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-1-1.jpg 2025w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"721\" src=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1-1024x721.jpg\" alt=\"\" class=\"wp-image-974\" srcset=\"https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1-1024x721.jpg 1024w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1-300x211.jpg 300w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1-768x540.jpg 768w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1-1536x1081.jpg 1536w, https:\/\/foldvik.no\/wp-content\/uploads\/sites\/3\/2021\/07\/VEGARD-TRANSLATION-NEW-NORWEGIAN-GEMSTONE-CARD-complete-2-1.jpg 2025w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"featured_media":1219,"menu_order":1,"template":"","meta":{"_acf_changed":false},"categories":[],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Foffas Edelstensgruve - Foldvik Familiepark<\/title>\n<meta name=\"description\" content=\"Hvilke flotte edelstener finner du i Foffas edelstensgruve? 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