Rundemyr, Øvre Eiker Kommune (Eger), Buskerud fylke, Norge
A small aegirine-bearing ekerite pegmatite genetically associated with the ekerite (a peralkaline riebeckitic arfvedsonite granite) of the Oslo region. The pegmatite dike is hosted in contactmetamorphic sediments of the Vikformation (silur). Type locality for
aegirine, known since around 1780.
Old specimens often labelled as coming from "Eger".
Note:
The locality has in some recent literature erroneously been refered to as belonging to the Nedre Eiker Municipality. The locality is, however, located close to the border between the municipalities of Øvre Eiker and Nedre Eiker, but well situated inside the Øvre Eiker Municipality.
References
- Strøm, H. (1784): Physisk-Oekonomisk Beskrivelse over Eger-Præstegiæld i Aggerhuus-Stift i Norge; tilligemed et geografisk kort over samme. Kiøbenhavn, Gyldendals Forlag 1784, 288p. [first note on aegirine from Rundemyr, as " crystalliseret hornsteen eller brun kantet og riflet Schoel"]
- Strøm, P. (1821): Undersökning af ett nytt Fossil. Kongliga Vetenskaps-Academiens Handlingar, 160-163 [first report on find of acmite = aegirine]
- Berzelius, J. (1821): Tillägg til föregående Afhandling. Kongliga Vetenskaps-Academiens Handlingar, 163-166 [on acmite]
- Möller, N.B. (1825a) : Achmit fra Eger. Magazin for Naturvidenskaberne, 6, 174-181
- Möller, N.B. (1825b): On the Locality of Acmite. Edinburgh Journal of Science, 3, 326-327
- Möller, N.B. (1825c): Nachricht über den Fundort des Akmit’s. Annalen der Physik und Chemie (herausgegeben zu Berlin von J.C. Poggendorff), 81,177-179
- Brøgger, W.C.(1890): Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit-und Nephelinsyenite. Zeitschrift für Kristallographie und Mineralogie, 16: 298-318 + Plate 14
- Grout, F.F. (1946): Acmite occurences on the Cuyuna Range, Minnesota. American Mineralogist. 31: 125-130 [with an analysis of "acmite" from Rundemyr]
- Raade, G. (1996): Minerals originally described from Norway. Bergverksmuseet Skrift 11, p 17-18 [on Acmite (= aegirine) from Rundemyr]
- Raade, G. (2010): Chemical composition of acmite/aegirine intergrowths from Rundemyr, Eiker. Norsk Bergverksmuseum Skrift 43: 29-34
- Larsen, K. E. & Stensrud, S. (2010): Mineralene i Rundemyrpegmatitten i Øvre Eiker, Buskerud. Norsk Bergverksmuseum Skrift 43: 53-64
Mineral List
23 entries listed. 17 valid minerals. 1 type locality (valid mineral).
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