Hi Thaeris,

I am not really sure if this is a Norway ragstone. The ragstones do have very small black dots, normally only visible when wet (Last picture). Maybe a view of the hone sides could help to identify.
Here are some pictures of my ragstones:

Name:  IMG_9736.jpg
Views: 655
Size:  43.7 KBName:  IMG_9738.jpg
Views: 706
Size:  30.5 KBName:  IMG_9739.jpg
Views: 627
Size:  43.3 KB