Leka Steinsenter - in the middle of Norways Geological National Monument.

At Leka Steinsenter the rocks and minerals are displayed and explained.

In addition the exhibition has around 500 rocks and minerals from all over the world and a shop with souvenirs.   Facebook: 

The Leka ophiolite complex is an exotic fragment of oceanic crustal material in this part of Norway, where rocks of typical continental type predominate. Thus, on the mainland (Gutvik/Austra) there are mainly granitic gneisses (old basement c. 1800 million years old). These gneisses represent original granitic rocks that were deformed and transformed due to high pressure and temperature. 

Sedimentary rocks that were deposited in continental basins and on the continental shelf, were folded and metamorphosed together with the older basement rocks during the Caledonian orogeny, when Baltica collided with Laurentia. On Solsem°yene there are metamorphosed sedimentary rocks of this kind. Some of these rocks reached great enough depths that parts of them started to melt. Now and then melts from the mantle intruded these environments. The melts solidified as plutonic rocks such as granite, syenite and gabbro. In Horta, gabbro, diorite, monzonite, syenite and granite occur together with metamorphosed sedimentary rocks, and at Sklinna there is granite. All these rocks are older than c. 400-450 million years.

Similar to most places along the Norwegian coast, there are few unconsolidated Quaternary sediments at Leka. However, by the path up to Solsemhula a very young serpentinite conglomerate is exposed. It is poorly consolidated and may be the youngest rock in Norway, formed from local scree material after the last glacial period (< c. 10 000 years old).

Rocks originally formed in the mantle are exposed on the northern and western parts of Leka (Fig. 5). They are most easily studied on the northern side, where also the ancient Moho is exposed. Four different rock types are common in the mantle section. The most common is harzburgite, which has a chocolate-coloured surface due to weathering. Fresh surfaces are dark green.


The picture below is taken from the road near Kval°ya in direction East: We can see crust material in parallell pattern (SW-NE) : Stripes of klinopyroksenite, wehrlite and dunite follows stripes of dunite and serpentinite. In the background is mantle material with harzburgite, lherzolite, dunite and serpentinite. See the map below.

Picture with higher resolution
Map with higher resolution