Geschichte: In autumn 2020, I was on a beautiful hike in Swedish Lapland. I really enjoyed the green boreal forest with the countless small ponds in between. However, hiking off-trail is not an option since it is all swamp land! On a rocky hill, I found this reddish rock - looks like a granite to me.
Geologie: This granite is made of the minerals biotite (black), alkali feldspar (reddish), quartz and plagioclase (both whitish-greyish). A granite forms when magma intrudes Earth's crust and then subsequently cools and solidifies below the surface. Due to slow cooling at depth, big crystals form which are visible by the naked eye.