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Unless it's just my screen, I don't see any translucence. I see whitish areas, but not translucence. We're all just looking at a screen though... much easier to say for sure when seeing it in person.

Yeah speed isn't really a great indicator in all cases. There are slow and fast JNats just like slow and fast coticules. I didn't mention the LI personally because I didn't see the usual slight...

Looks like a Japanese natural stone to me. Definitely not novaculite. You'll know when you're lapping an Ark.