Pictures: Marginal Border Series (MBS)

Close up of perpendicular feldspar rock near the western margin of the Skaergaard intrusion, Mellemø. The rock is defined by branching crystals of plagioclase feldspar directed inwards toward the centre of the intrusion. The rock is commonly taken as a good illustration of heterogeneous crystal nucleation and growth on a solid surface. The crystallisation is probably closely related to volatile fluctuations. Photo by Jens C. Andersen.

© 2005