I received a brand new 50 x 200 mm coticule from a vendor today. It originally came from Ardennes Coticule's quarry. I looked at the stone, then laid it on a level surface and laid a level across the 50 mm width, and the stone has a definite slanted top. My question to more knowledgeable folks than I (other than Chinese 12k, this is my first natural stone) if this is to be expected? I plan on using this size as a "palm stone," so the slant is not as big a deal as it might otherwise be, but with the slant, it seems like it would be difficult to use on top of a table, at least not without altering my stroke. Should I ask the vendor to swap it, or is this par for the course with coticules? From other HADdict posts out there, I know that there are multiple coticule owners around here.
Thanks in advance.