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From your last pics I would say that the bottom stone is a yellow-green thuringian :) Those are the most sought after.

The slurry of the middle one seems pretty light and it's actually not that...

Nice find. The top looks coticule and the bottom a lightgreen? thuringian, I've seen similar sawmarks on mine. I can't place the middle one, it seems too thick to be a thuringian. How big are they?