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Don't let the size put you off testing that paddle. It was common enough for a thin slither of coticule 3-5mm to be glued into a paddle. You will never be able to remove the stone from the paddle but...

That little one I thought might be a Vermont or Vosgienne. Doesn't have the green I was seeing in the big pictures so it'll have to just be a regular slate. Test it against the others as it looks...

Going from left to right, And these are only guesses.

https://c1.staticflickr.com/5/4254/35531674845_20df811b88_z.jpg

1. Belgian blue,
2. Belgian blue,
3. Belgian blue, Possibly La Lorraine....