Quote Originally Posted by DaveW View Post
It looks like a carborundum stone of some sort. If it is, it's made of the same general abrasive that is in sandpaper, so you will probably need to use loose grit of some sort to flatten it.

I'd clean it up first by taking it out of the base and immersing it in either kerosene or something warm and soapy if you're averse to using kerosene, and then it'll be easier to tell for sure that it's silicon carbide and not just a dark india stone (it does look more like silicon carbide).

You'll have to determine how coarse it is, it may be too coarse for razors except those with extreme damage - and better for setting bevels on knives and tools.

It feels slightly coarse, and it kind of sparkles slightly when holding to the light. It's stuck to the base faily tightly, I cannot seem to remove it with my hands only. Since I don't have any other stones, polishing/finishing then it's pretty much useless to me right?