Alnö ("the aln-ey") is an island in the Gulf of Bothnia just outside Sundsvall in Medelpad, Sweden. It has an area of 67.79 km2 and a permanent population of 8,417 (as of 31 December 2010), although its summertime inhabitants are about twice that number. Most of the island's inhabitants work in Sundsvall and other towns on the mainland.
Alnö
False color satellite image of Alnö outside Sundsvall in the Gulf of Bothnia.
The island is 15 km long and 6 km wide on the widest spot. It is connected to the mainland by a 1,042-meter-long (3,419 ft) bridge, which was the longest bridge in Sweden when it was opened in 1964.
Evidences of habitation on the island predate the Viking Age, and there are several tumuli on the island from that period. The old stone church near the modern bridge was built in the 12th century. The island saw a population boom in the second half of the 19th century, due to the development of steam-driven sawmills. In 1850 the island had 950 inhabitants, mainly farmers and fishermen, but by 1900 the population had grown to almost 7,000, following the establishment of 18 sawmills between 1860 and 1897.
As result of decreased foreign trade during World War IIapatite was mined in Alnön from 1943 to 1945.[2] Apatite was separated by flotation but results were meager.[2] While the separation process had improved in 1945 the end of the war the same year meant also apatite mining became unprofitable.[2]
Alnö was affected some 570 million years ago by a massive volcanic eruption. The northeastern part of the island is rich in carbonate minerals, and it is one of few areas in the world with a carbonatite volcanic complex.[3] Its chemistry is very different from the ordinary granitic rock that form the rest of the island, resulting in a number of unusual minerals, such as baryte and aegirine.[4]
^von Eckermann, Harry (1948). The Alkaline District of Alnö Island. Ca, Avhandlingar och uppsatser. Vol. 36. Stockholm: Sveriges geologiska undersökning. pp. 3–176.
^Kresten, Peter; Troll, Valentin R. (2018). "The Alnö Carbonatite Complex, Central Sweden". GeoGuide. doi:10.1007/978-3-319-90224-1. ISBN978-3-319-90223-4. ISSN 2364-6497. S2CID 135266142.
External linksEdit
October 18, 2023
alnön, alnö, island, gulf, bothnia, just, outside, sundsvall, medelpad, sweden, area, permanent, population, december, 2010, although, summertime, inhabitants, about, twice, that, number, most, island, inhabitants, work, sundsvall, other, towns, mainland, alnö. Alno the aln ey is an island in the Gulf of Bothnia just outside Sundsvall in Medelpad Sweden It has an area of 67 79 km2 and a permanent population of 8 417 as of 31 December 2010 although its summertime inhabitants are about twice that number Most of the island s inhabitants work in Sundsvall and other towns on the mainland AlnoFalse color satellite image of Alno outside Sundsvall in the Gulf of Bothnia GeographyLocationGulf of BothniaCoordinates62 24 N 17 28 E 62 400 N 17 467 E 62 400 17 467Area67 79 km2 26 17 sq mi 1 AdministrationSwedenCountyVasternorrlandThe island is 15 km long and 6 km wide on the widest spot It is connected to the mainland by a 1 042 meter long 3 419 ft bridge which was the longest bridge in Sweden when it was opened in 1964 Evidences of habitation on the island predate the Viking Age and there are several tumuli on the island from that period The old stone church near the modern bridge was built in the 12th century The island saw a population boom in the second half of the 19th century due to the development of steam driven sawmills In 1850 the island had 950 inhabitants mainly farmers and fishermen but by 1900 the population had grown to almost 7 000 following the establishment of 18 sawmills between 1860 and 1897 As result of decreased foreign trade during World War II apatite was mined in Alnon from 1943 to 1945 2 Apatite was separated by flotation but results were meager 2 While the separation process had improved in 1945 the end of the war the same year meant also apatite mining became unprofitable 2 Contents 1 Geology 2 Sport 3 Notable citizens 4 References 5 External linksGeology EditMain article Alno Complex Alno was affected some 570 million years ago by a massive volcanic eruption The northeastern part of the island is rich in carbonate minerals and it is one of few areas in the world with a carbonatite volcanic complex 3 Its chemistry is very different from the ordinary granitic rock that form the rest of the island resulting in a number of unusual minerals such as baryte and aegirine 4 The most famous of the rocks of Alnon is the alnoite named from the Island which is a lamprophyre chiefly composed of biotite or phlogopite and melilite as essential minerals commonly with olivine calcite and clinopyroxene Perovskite apatite nepheline and garnet may also be present Diamonds have also been found on Alnon but only in very small amounts 5 nbsp Alnobron connects Alnon with the mainland and was Sweden s longest bridge when it opened in 1964 Sport EditAlno IFNotable citizens EditVilma Abrahamsson Football player Gunnar Hellstrom Director Tina Nordlund Football player Hjordis Schymberg Opera singer Andreas Yngvesson Football player Helen Sjoholm Singer and actressReferences Edit Statistisk arsbok 2011 PDF in Swedish Statistics Sweden p 12 Archived from the original PDF on 13 January 2012 Retrieved 5 July 2011 a b c Lundegardh Per H 1971 Apatit Nyttosten i Sverige in Swedish Stockholm Almqvist amp Wiksell p 70 Andersson Magnus Malehmir Alireza Troll Valentin R Dehghannejad Mahdieh Juhlin Christopher Ask Maria 2013 04 17 Carbonatite ring complexes explained by caldera style volcanism Scientific Reports 3 1 1677 doi 10 1038 srep01677 ISSN 2045 2322 PMC 3628075 PMID 23591904 von Eckermann Harry 1948 The Alkaline District of Alno Island Ca Avhandlingar och uppsatser Vol 36 Stockholm Sveriges geologiska undersokning pp 3 176 Kresten Peter Troll Valentin R 2018 The Alno Carbonatite Complex Central Sweden GeoGuide doi 10 1007 978 3 319 90224 1 ISBN 978 3 319 90223 4 ISSN 2364 6497 S2CID 135266142 External links EditRock samples from Alnon Retrieved from https en wikipedia org w index php title Alnon amp oldid 1158250208, wikipedia, wiki, book, books, library,
