Øyegneis

Øyegneis
Foto: Eurico Zimbres

Øyegneis er en metamorf bergart med store, vanligvis ovale, krystaller («øyne») eller korn av kalifeltspat i en båndet eller stripet mørk grunnmasse av biotitt-rik gneis. Granittisk gneis er dannet ved «pressing» og omdanning av granitter dypt nede i jordskorpa. Øyegneis er en variant av granittisk gneis.[1]

Øyegneis er svært vanlig både i det norske grunnfjellet og i den kaledonske fjellkjeden, gjerne som utklemte omdanningsprodukter av grovkornete eller porfyriske granitter.[2][3]

Referanser

  1. ^ «Gneis | Norges geologiske undersøkelse». www.ngu.no. Arkivert fra originalen 27. januar 2019. Besøkt 26. januar 2019. 
  2. ^ «Geo365 | Nasjonalbergart – Gneis». www.geo365.no. Besøkt 26. januar 2019. 
  3. ^ N.N. (18. mai 2011). «Orthogneiser, migmatitter og amfibolitter - Naturhistorisk museum». www.nhm.uio.no (på norsk). Besøkt 26. januar 2019. 

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