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Why would you not chamfer your Llyn Idwal? If you don't chamfer your coticule you can damage a razor as well.

Who wouldn't prefer the more expensive stone?

Anyway LIs are currently kind of...

The color of your stone is very close to that of all green CFs but I do think it's a LI. This type should be in the same grit range as CFs but harder.

If it's not flat have fun lapping :D

Edit:...

I'm still trying to figure out which types of stones are Llyn Idwals. If flaking is the common denominator then I know of 3 different types which might be LIs and I have one additional stone covered...