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Great info, Olivia! IDK anything about geology, but the slates are pretty soft (they flatten relatively easily on dry sandpaper that's meant for wood). There is also a noticeable difference in grit...

I happened to stumble across a few nice pieces of slate. Being ever curious, I rubbed a spoon on one & it left quite a scratch pattern on the stainless steel. So I lapped a few of them just for...