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Yes, the yellow lake stones from salmens is from the same quarry as the purple yellow lake. I'm not sure if salmens mined stone from more than one quarries in that area, and named them all yellow...

That's unfortunate... (Not that I would like to see a National park destroyed for this reason). Regarding their price, for many many good stones, on antique stores and eBay, the sellers just sell...

A very good stone. With slurry it looks and cuts as BBW, but much faster, maybe 5x faster. With plain water it gives a mirror like finish, you can shave quite comfortably, and with oil it gets even...