Stone ID

This stone is extremely hard a dmt 325 won't hardly touch it.
When I got it I looked like it was around a 200K, very porous.
It seems to be as hard as a Translucent, I was able to fatten it enough to get two large shiny spots on the face and they look like glass. This stone only liked a 1/32" of being flat.
It is formation rock or synthetic I believe. It is tan in color with just a tinge of a red shade especially where I polished it on the 325 dmt. In the pictures the red comes outlooks like BBW, but with the naked eye it looks tan almost like a Frictionite. Where I polished the stone It will polish metal, where it is still rough it cuts. I have never seen anything like it except the new translucent Arkansas I got that set a bevel until I was able to get it polished, took forever. Any help will be appreciated.
Thanks, russhiAttachment 82498Attachment 82497Attachment 82499Attachment 82500Attachment 82501Attachment 82502Attachment 82503Attachment 82504Attachment 82505

Well, here's my weird theory: it IS a coarse man-made hone and you glazed a couple of high spots, or wore down the grit and get good polishing from the binder. Did it wear anything off your DMT?

I can't imagine how a really fine hone would gain such a coarse looking surface. Into that vacuum of imagination, then, steps weird theory.

You may be right. The 325 would took forever. I got out the plate glass and the 90 grit silicon carbide lapping and took it to 180 grit, it took close to an hour and will have to work on it a little more in the morning. I pick up stones of any kind, every chance I get and have been doing it for 10 years. I flatten silicon carbide and aluminum oxide stones all the time and I can do it quick, but this stone is a different color and texture than any synthetic stone I have ever run across, besides being as hard a translucent Arkansas. almost impossible to flatten. I don't know if you have ever used 90 grit on plate glass before, It will flat eat up a stone. I usually use it on India oil stone, which this might be what this is.

Is it harder than flattening India stone? This would be my guess.

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I lapped it with 90 grit, followed by180 grit on glass and finished up on a dmt 325. finally got it slick. when you look down the face at an angle looking at the like it shines like a mirror. I set the bevel on a razor I was working on. I would guess the grit to about like a hard Arkansas, but cut faster. I used it with water. I have some India oil stones but don't know much about them, except I tried lapping them and I quit because they were to hard. This stone is a different color than my combination India oil stones. They are red and black. this stone is solid and is a light tan. Doe's the color of India oil stones indicate their grit. The color of this stone looks a lot like a Frictionite, it honed done like glass.

It may be a India oil stone, but the color looks like a frictionite

the pictures look red, but the stone is tan. When it is wet it has a little red cast to it.