On geological maps, the centre of Flekke appears as a circular rock structure. The rock here originated in a very old gabbro complex that formed several hundred million years ago.
The original rock was rich in the mineral olivine and formed deep in the Earth’s crust. Later, the rock was metamorphosed under high pressure and temperature. This gave rise to a special structure in which pink garnet forms rims around older minerals.
The area also contains dark rock lenses that have been transformed into eclogite, a rock formed very deep in the Earth’s crust.
