Unusual Vintage Sharpening Stone ID

So I accidentally bought this stone on the bay. Not sure what it is. Very hard and puts a nice edge on a knife with slurry. Didn’t look or feel like oil was used, but the box and stone have a slight smell. So I will do a simple green soak. It cleaned up well and has su and greenish grey brown slurry.

It was suggested it could be a glanrafon Welsh slate, which there was one labeled on the bay that sold. It looked a bit different than this one though. Only real info I can find on them is about the mine though which closed in 1915. Couldn’t find any other pics of them either.
Let me know what you think and if you have any pics of a glanrafon like this or if it is something else.

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beautiful stone! would that be a finisher?

Nice looking rock you got there! I dont know anything about them but its a looker!

Honestly I don’t know but I really want to blurt out coticule.

I originally thought coticule, but then changed my mind after looking at the pictures for a bit. Still not 100% sure it isn't, but never saw a coti with su either. If it is a coti it is some old long lost forgotten layer i have never seen, still I have a strange unknown coti layer so it is possible too.

I want to say Coticule as well, but I'm not at all sure. VERY cool stone!!!

The more I mess with this stone the more it seems like a coticule in feel, slurry and looks. Everything I find about the glanrafon tells me it was just a quarry not a stone type. The one previously seen with the label from the bay was not a good label to tell anything. I found a fully intact labeled one and it is a Charnley Forest stone.

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Looks like the stones we have discussed as so-called Fiddish River Hone stone here in the Forum a few years ago.
Here are two links to the old threads:

http://straightrazorpalace.com/hones...ned-stone.html

http://straightrazorpalace.com/hones...id-please.html

Best regards and have all a Merry Christmas!

Peter

It's a Welsh stone Glanrafon is an old slate quarry in Wales, It's no longer a working quarry closed in 1915.

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It could also be another Welsh stone a llyn idwal hone?

https://www.google.co.uk/search?clie...H-wKBo#imgrc=_