Otherwise I would recommend the management to delete the post.

Superficially seen, it might, however very unlikely, even be a Norwegian rhomben porphyry from the Oslo area.

But without a sharp photo it is basically impossible to establish what kind of rock this is.

On the other hand, this photo is suspiciously similar:

In any case it's a porphyry with sharp, tabular crystals of light-colored feldspar individually and in clusters in a black basaltic (maybe dacitic) matrix.  In the one specimen I have, most (maybe all) of the feldspar appears to be twinned on the Carlsbad law.  I have seen a number of objects made from it over the years, but until now I had not looked into where it comes from.