Found my third deposit of marble. It's pink! It was on the cliff face of the same mountains as my green marble, in slate. There were only three blocks of it sadly. I plan on clearing the rock up there to see if there is more, but it's high up and I was in a hurry when I found it. Now I have all three marble types. All I need now is Kimberlite and Phylite, the sisters of mischief.