File:Halleflinta.jpg
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Svenska: Upplands landskapssten är den täta, finkristallina hälleflintan. Trots sina likheter med flintan har hälleflintan ett helt annat ursprung. Ursprungligen, för ca 1900 miljoner år sedan, avsattes den som vulkanaska. Hälleflintan är nästan alltid tydligt randig, i färger som gråsvart-olivgrå-rödvit-svartgrön-gulbrun. Den förekommer ofta växellagrad med urkalksten och metallmineraliseringar. Hälleflintan användes under stenåldern till redskap i flintfattiga områden, särskilt i norra Skandinavien. Den har brutits i liten skala för framställning av ställsten för infodring av masugnar.
English: Halleflinta from Uppland in Sweden. The rock was formed about 1900 million years ago as volcanic ash. Halleflinta almost always has a striped appearance. Colours include grey, black, red, white, green, yellow or brown. |
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| Source |
https://www.flickr.com/photos/geologicalsurveyofsweden/5636822957/ Uppland
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| Author | Anders Damberg of Geological Survey of Sweden SGU |
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This image, originally posted to Flickr, was reviewed on November 20, 2011 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:24, 20 November 2011 | | 1,764 × 1,255 (324 KB) | File Upload Bot (Magnus Manske) (talk | contribs) | {{Information |Description=Photo: Anders Damberg Upplands landskapssten är den täta, finkristallina hälleflintan. Trots sina likheter med flintan har hälleflintan ett helt annat ursprung. Ursprungligen, för ca 1900 miljoner år sedan, avsattes den so |
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