Found in old drawer

I have spent the winter at my in-laws house and while cleaning up the basement I found an old rack of wooden draws the my father-in-law's father had. He was a boat builder. In one of the draws was some sharpening stones.
I know one is an Arkansas but the other I have no idea. It looks greenish yellow and is very smooth. I think he used the sides and bottom for sharpening machine tools. Any help on id of this stone would be helpful. It had a small sticker on one end, they both did but they were unreadable. Both are 8" x 2"

if you could post a close-up of the surface of the grey one, it would help ID it.

When you lap it if a silky smooth slurry gives up easily, you got a real winner. Could be of a German water hone family.

Yes it does. And the surface feels like a 8000 Norton but puts a polish on the blade not lines. I wonder if I should cut an 1" off for a slurry stone?

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Originally Posted by bnitch

Yes it does. And the surface feels like a 8000 Norton but puts a polish on the blade not lines. I wonder if I should cut an 1" off for a slurry stone?

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That is a tough one. Given the limited quantity of those stones that size I would wait a while to do it until you are really sure. You might find a small version of it later on to sacrifice. I use a SRD barber hone combo that has water stone on one side to bring up slurry on mine. As far as hones go, larger is so much more pleasant and makes it faster and more consistant IME. You can also bring up slurry with just abouut anything that is harder than the water hone. Great find.:)

may be it's one of them brown-ish thuringians?

i wouldn't cut a slurry piece. it's easy to generate slurry with one of those small diamond cards, which are inexpensive, if you don't already have a diamond hone.
but if i am to cut a slurry piece, i wouldn't make it rectangular, i'll just cut a wedge so that one of the hone surfaces remains at its full area.

I wouldn't use anything to ruff like diamond plate, when I lapped it with it it created a lot of dust and would probably be gritty or cut too fast. I've got other slurry stones. The Exide stone works best but I like it by its self. But I like it as a sharpening stone itself. The little JAPANESE stone or the BBW work well, the 12K makes a lite milky slurry.

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Originally Posted by bnitch

(…) I wonder if I should cut an 1" off for a slurry stone?

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A hard stone like a translucent Arkansas works pretty good to create a slurry and there are for sure no Ark-parts in the Slurry, since the Ark doesn´t create a slurry. I tried that. Right now, I use a Roszusec, which is extremely hard as well. I´m wondering If a block of matted glass would work, too…

Regards,
tok

After useing the stone a little with a couple different slurrys the surface is more like Brownish, greenish, yellowish glass. Works well with just plain water so I think I'll just use it for finishing and see which shaves best the Coticule or what ever this stone really is.