Latitude: 65°2'N
Longitude: 13°50'W
Helgustaðanáma, Reyðarfjörður, Ísland
An occurence of optical-grade calcite known since 1669. "
Iceland spar" was mined in an organized way from 1855. Regular mining ended in 1925. In 1975 the location received the status of a "natural monument".
Located near Helgustađir farm, 7 km E of Eskifjördur (Eskifjord) town (note, however, that Eskifjördur is also the northern branch of Reydarfjordur and the name of a farm), in Reydarfjord.
The locality is also famous for zeolites, especially stilbite.
References
- Thoroddsen, Th. (1890): Nogle Bemærkninger om de islandske Findesteder for Dobbeltspath. Geologiska Föreningen i Stockholm Förhandlingar 130: 247-254.
- Kristjansson, L. (2002): Iceland spar: The Helgustadir Calcite Locality and its Influence on the Development of Science. Journal of Geoscience Education, 50, 419-426.
External Links
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http://serc.carleton.edu/files/nagt/jge/abstracts/Kristjansson_v50n4p419.pdf
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http://giantcrystals.strahlen.org/europe/helgustadir.htm
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Helgustadir Iceland Spar Mine - by Daniel Russell
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http://www.strahlenfoundation.com/home.php?action=locations&id=95Mineral List
6 entries listed. 3 valid minerals.
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