Spectrolite is mined in Ylämaa Finland.
And Larvikite, from Larvik Norway.
(The first two pictures are mine, the Larvik is from http://www.mindat.org/ , one of the best places on the web to learn about rocks.)
These are all similar rocks, but when you have them in hand, the differences are simple to see. I can't really explain how Spectrolite feels smoother or Larvikite is heavier to work. If in doubt, research, research, research. That's what the internet is for!