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An 18th century find of an erratic lazulite-andalusite-quartz boulder in Södermanland, Sweden, and its implications
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0003-2109-2277
Sveriges Geologiska Undersökning.
2019 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 141, no 3, p. 216-221Article in journal (Refereed) Published
Abstract [en]

At some point in the 1750s, a jeweller-apprentice by the name Jacob Hässelgren found an erratic bouldernext to the Eskilstuna country road in the neighbourhood of Ärla in Södermanland. It contained a deep bluemass of lazulite, at the time an unknown mineral. Pieces of the find eventually reached Daniel Tilas, TorbernBergman and Axel Fredrik Cronstedt ˗ renowned natural scientists in Sweden ˗ but no detailed studies of thematerial seem to have been carried out by them. Two fragments of the original boulder are still preserved,and a recent examination shows them to consist of mainly lazulite, andalusite, quartz, pyrophyllite, augeliteand svanbergite. The average composition of lazulite is Mg0.700Fe2+0.261Mn0.003Al1.954Fe3+0.017 P2.031O8(OH)2.The mineral assemblage is characteristic of known occurrences of phosphate-Al silicate-quartz appearingalong the Protogine Zone in southern Sweden. Transportation of the boulder from its source rock, likely tobe located somewhere along the Protogine Zone, ought to have occurred in connection with the developmentof the Fennoscandian ice sheet during the final Weichselian deglaciation, and the material waspossibly discharged from floating ice on the Yoldia Sea.

Place, publisher, year, edition, pages
Stockholm: Taylor & Francis, 2019. Vol. 141, no 3, p. 216-221
Keywords [en]
lazulite, glacial transportation, erratic, Protogine Zone, Ärla, Södermanland
Keywords [sv]
lazulit, glacialtransport, flyttblock, protoginzonen, Tilas, Ärla, Södermanland
National Category
Geology Geosciences, Multidisciplinary
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3613DOI: 10.1080/11035897.2019.1621369OAI: oai:DiVA.org:nrm-3613DiVA, id: diva2:1375964
Available from: 2019-12-06 Created: 2019-12-06 Last updated: 2019-12-06Bibliographically approved

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