Uglvik (Ugelvik), Otrøy (Otrøya; Otterøy), Midsund, Møre og Romsdal, Norway

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Uglvik, Otrøy, Midsund kommune, Møre og Romsdal fylke, Norge


A orogenic garnet peridotite body within the Scandinavian Caledonides located about 3 km NE of Midsund (the center of the municipality with the same name) on Oterøy Island. The Uglvik garnet peridotite consist of interbanded variable composition with 50 % garnet peridotite and 50 % garnet free peridotite.
Cr annd V - bearing pyrope from Uglvik are showing a"alexandrite-like effect", having a violette colour in daylight and a winered color in artificial light. These has also been cutted as gems.
Van Roermund et al (2000) reported evidence for petrographic and mineral chemical characteristics of relict super-silicic (majoritic) garnet microstructure in the in the Uglvik (Uglevik) garnet peridotite.

References

- Hysingjord, J. (1967): Edel granat fra Otterøy ved Molde. Norges Geologiske Undersøkelse 255 (Årbok 1967): 5-9
- Van Roermund, H.L.M., Drury, M.R., Barnhoorn, A. and De Ronde, A. A. (2000): Super-silicic garnet microstructures from an orogenic garnet peridotite, evidence for an ultradeep (>6GPa) origin. Journal of Metamorphic Geology 18: 135-147

Mineral List

Chromite 'Clinopyroxene Subgroup' Diopside var: Chromian Diopside

Enstatite 'Hornblende' 'Olivine'

Pyrope Rutile ? 'Serpentine Group'

9 entries listed. 4 valid minerals.