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I have a brown hindostan, it is probably the hardest rock I have had. I tried many different natural razor stones. I will send a photo when I find it.

"It grinds the Swaty with ease." I haven't...

I have a very similar one, a bit smaller. You can come across it on ebay uk, it is sold under the name Hindostan. He says it is very hard, this also fits the description. Washita(the only possibility...

Too late maybe but the stone in the first post is a Hindostan/India stone.