Natural Japanese? Ideas please

Gentlemen, I come with another stone I need help with the identification of.
The measurements are 25x4.5x5.5 cm and as you can see it has been used by someone who knows little of natural stones. It is very dished on one side and has been used with large amounts of oil.
I have clean it up as much as I can and now use it with water. I cannot comment on how it soaks up water because of the oil impregnation, but the slurry is a sandy colour. It cuts well and the grit is probably over 2000, maybe a tad more. It has the most beautiful grain and patterns in.
Any suggestions on removing the remaining oil and oil smell would also be gratefully received. It does work well with water at the moment.Attachment 70342Attachment 70343Attachment 70344Attachment 70345

This stone does not look like Japanese natural, also the dimensions are very unconventional for a jnat.

+1 I don't think jnat either. Maybe Hindostan, maybe the bearded lady. You will never get all the oil out. You can use oven cleaner, some Comet w/ bleach and a wire brush, I use the CLR bath & kitchen. Some guys have heated them in ovens to loosen the oil and then cover in kitty litter to draw out the oil. All kind -a- weird schtuff to get the oil out. She'll need to be lapped flat which will also help expose a fresh surface.
Good luck have fun,
MIke

As long as you keep flames away, a kerosene or gasoline soak can also dissolve out the oil. I would do this as a last resort and if you do it, for gosh sakes store it outside for a week to let it air dry.

If it is a Hindostan then I should be using it with oil. I am not convinced it is one, after some research on the net. It also does not fit with the Hindostan that Mr Miller has for sale on his website. Mine is absolutely not a finisher, and has no glassy surface like the Llyn Idwal or CF has after some use.

Looks like indian stone, an old one.