Image from Ersvika and Ersvikskjäret nature reserve, in Hurum (buskerud county), Norway. The water is the middle Oslo Fjord. The rocks in the front belong to a small craton portion of the otherwise younger Oslo Graben. The dominating minerals are leptite (bright) and an amphibolite intrisuin (dark).
<a href="//commons.wikimedia.org/wiki/User:Bjoertvedt" title="User:Bjoertvedt">Bjoertvedt</a>
<span class="int-own-work" lang="en">Own work</span>