{"id":18557,"date":"2023-03-23T10:00:42","date_gmt":"2023-03-23T09:00:42","guid":{"rendered":"http:\/\/globetree.se\/?page_id=18557"},"modified":"2023-03-26T12:15:06","modified_gmt":"2023-03-26T10:15:06","slug":"sten-grangesberg","status":"publish","type":"page","link":"https:\/\/globetree.se\/en\/sten-grangesberg\/","title":{"rendered":"Sten – Gr\u00e4ngesberg"},"content":{"rendered":"
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Gr\u00e4ngesberg, Dalarna County<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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UN-stone: Magnetite iron ore, Gr\u00e4ngesberg, Dalarna
approx. 1900 million years<\/u><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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I am a block of magnetite iron ore from Gr\u00e4ngesberg in southern Dalarna, south of Ludvika, a smaller copy of a similar block of iron ore that stands in Dag Hammarski\u00f6ld's meditation room in the UN building in New York. Like most other ores in Bergslagen (and also in V\u00e4sterbotten and Norrbotten) I have an age of around 1900 million years. I formed in close association with the volcanism at this time in Bergslagen, although the details of my formation are still debated.<\/p>

There are two important iron ore minerals, hematite and magnetite, and two kinds of iron ore, hematite iron ore and magnetite iron ore. Both hematite and magnetite are iron oxides, compounds consisting of iron and oxygen, but with different formulas; hematite has formula \nFe2<\/sub>O3<\/sub>, and magnetite formula Fe3<\/sub>O4<\/sub>. \nIt gives them different looks and characteristics. Hematite is non-magnetic and has a gray-blue metallic color, but if you grind the hematite to a fine powder, it turns a brown-red or blood-red color. Hematite iron ore is therefore also called \"bloodstone ore\". Magnetite is magnetic \u2013 as the name suggests \u2013 and black in colour. Magnetite iron ore is therefore also called \"black ore\". The iron ore in Gr\u00e4ngesberg consists mostly of magnetite ore, but there is also some hematite ore there. If you have a magnet with you, you can test that I am magnetic, and thus consists of magnetite ore.<\/p>

Iron ore mining in Gr\u00e4ngesberg began in the 16th century, and over time Gr\u00e4ngesberg became one of Sweden's largest and most important iron ore mines, owned by Gr\u00e4ngesbergsbolaget. They had their own railway to transport the ore to Oxel\u00f6sund, where the smelter where iron was made from the ore was located. Mining continued until 1989, when the mine was shut down. But there is still iron ore left in the rocks below, so it is not impossible that mining will be resumed at some point in the future.<\/p>

Geologist \u00c5ke Johansson<\/em>
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Back to the Stone Circle<\/a><\/span><\/p>\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Gr\u00e4ngesberg FN-stenen: Magnetitj\u00e4rnmalm, Gr\u00e4ngesberg, Dalarnaca 1900 miljoner \u00e5r Jag \u00e4r ett block av magnetitj\u00e4rnmalm fr\u00e5n Gr\u00e4ngesberg i s\u00f6dra Dalarna, s\u00f6der om Ludvika, en mindre kopia av ett liknande j\u00e4rnmalmsblock som st\u00e5r i Dag Hammarski\u00f6lds meditationsrum i FN-huset i New York. I likhet med de flesta andra malmer i Bergslagen (och ocks\u00e5 i V\u00e4sterbotten och Norrbotten) …<\/p>\n

Sten – Gr\u00e4ngesberg<\/span> Read More \u00bb<\/a><\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","_mi_skip_tracking":false,"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"trp-custom-language-flag":false},"uagb_author_info":{"display_name":"Peroy","author_link":"https:\/\/globetree.se\/en\/author\/peroy\/"},"uagb_comment_info":0,"uagb_excerpt":"Gr\u00e4ngesberg FN-stenen: Magnetitj\u00e4rnmalm, Gr\u00e4ngesberg, Dalarnaca 1900 miljoner \u00e5r Jag \u00e4r ett block av magnetitj\u00e4rnmalm fr\u00e5n Gr\u00e4ngesberg i s\u00f6dra Dalarna, s\u00f6der om Ludvika, en mindre kopia av ett liknande j\u00e4rnmalmsblock som st\u00e5r i Dag Hammarski\u00f6lds meditationsrum i FN-huset i New York. I likhet med de flesta andra malmer i Bergslagen (och ocks\u00e5 i V\u00e4sterbotten och Norrbotten)…","_links":{"self":[{"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/pages\/18557"}],"collection":[{"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/comments?post=18557"}],"version-history":[{"count":22,"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/pages\/18557\/revisions"}],"predecessor-version":[{"id":19235,"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/pages\/18557\/revisions\/19235"}],"wp:attachment":[{"href":"https:\/\/globetree.se\/en\/wp-json\/wp\/v2\/media?parent=18557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}