Anyone know what this is?

The striations at the top are odd. The smoothness could be just stream polishing, although it looks almost too shiny for that. Could it be a man-made object which has been partially melted?

It does look like melted. Is it heavy?

It has some lines that resemble sedimentary rocks, but it does look metallic to me. It could be a human made object. http://meteorites.wustl.edu/id/z_metal.jpg
http://meteorites.wustl.edu/id/z_metal2.jpg

Thank you for your suggestions!

Some more details. I found this 20 years ago in a small landslide on a slope, in a forest in Norway.

It feels like a rock. The weight is 40grams.

Pictures might lie a bit, it is darker than in pictures. Ill borrow a camera and take new ones.

Take the pictures with more light, outdoors, they are too dark. You live in a country with three meteorite impact craters, I have seen in the database, do you live near these sites: Gardnos, Mjolnir, Ritland? I envy you. You could find stones related to the impact event near these sites.