Thread: New mystery stone..

Edit: thanks to Piet I have changed the title of the thread and the mystery has been solved.

Picked this up at the antique mall for a couple dollars... At first I thought I was total junk. But after getting home and spending a few minutes lapping, I realized this thing is actually Much Much finer than I thought, I am comparing it to my German Honess, and it is just as fine grit. 8000+ but much different in regardes to hardness. It's nothing like any other stone I have. Small sparkles, but hard. And fine, with grain.( what is the geological term used for those dark lines you see... I need to learn the terminology)

Maybe Thuringian

I dont have any confirmed thuri's. But I have some German labled stones that are probably thuri.. This feels just as fine grit, but the slurry I think is to white, and it is harder to create a slurry...

I always wondered what the experts on these forums would charge if I were to send a flat rate box, with a return label in it. For them to classify my stones.... Perhaps If I can ever actually start winning some labled thuri's on the bay. Or heaven forbid an esher.. Or I get lucky and find some at flea markets. I will finally have something to compare to.

It reminds a little bit of a Dalmore Blue, a sandstone ranging from coarse to fine. I don't think it is one but it might be similar.

All Thuris I had in my hands (last one was today) were not that hard. Can you show wet picture without the slurry.

Every thuringian I have had in my hands are pretty soft & you "can" generate a slurry off the stone with just a razor & circles with just a slight pressure. If the water soaks into it readily, I'll bet Piet is right on the $.

Scottish Dalmore Blue. I like that Piet, and after spending several hours cleaning it up, with several hours more to go. These are the photos. With different angles, and different lighting,,
So are these rare? Google only turned up a few old threads on SRP. One article I read showed one in a box with the exact size as mine, 8x2x1

As you can see its pretty beat up.. How much would you guys keep lapping? I am thinking until it looks like a new stone, which will probably change the thickness to around 7/8 or less.

I am not good at solving the mystery of grit size. But I ran my fingernails across my Norton 4k. And then the Dalmore blue. And I think that is close.

I think it's better to round the edges instead of a 45 degree angle. You don't have to lap away all the chips but you should round the edges of the chips.

Here are some of my DBs for comparison. They're not common but I wouldn't call them rare either. They're pretty porous and sparkle.

Hmm Piet's famous wooden table. I would agree with himjust roun the edges. I would use only one side of it for honeing- the one without the flaky chip. For Dalmore Blue it in my opinion does not have enough yellow streaks. Can you show detail of that flakey chip?

in piet's photo the two stones to the left is what i recognize as a dalmore blue . the pattren on your stone is different . but piet and adrspach has more experience on this stone then i do .