Not sure

You might want to post a clear, well-lit pic of the stone. If there are any manufacturer's marks on it, be sure to show those. Somebody here (maybe many) might recognize it for the type, such as an oilstone, waterstone, etc.

If the stone has never been used with oil, and/or it isn't pre-soaked by the manufacturer with oil, it'll likely drink up moisture (water) when wetted. In such case, it's likely usable with water at least, and perhaps oil as well. If the water instead beads up and rolls off the surface, there's a good chance it's an oilstone, or at least one that's been used with oil, or pre-treated with oil or grease previously, as some manufacturers do with their oilstones. In that case, it likely wouldn't perform very well if used with anything else (like water, or anything mixed with water), and likely should continue to be used with oil.

There's also the possibility of a dedicated waterstone that should only be used with water. Some of these will be irreparably damaged or diminished in performance, if they're used with oil. That's why a clear pic will be helpful (hopefully), as some of the waterstone experts here can warn you off using oil with it. A pic is the best first step, in getting some good advice.


David
 
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