If pic 2 and 3 are different sides of the same stone that one is probably a Coticule.
4th and 5th different sides of the same stone - don't know but the purple side looks like a BBW black maybe slate backing but not sure.
Last one looks like an Arkansas for course work.
Any side photos and sizes?
Well, if the worst ripoff you ever get on stones is $25 you are doing pretty good. I am sort of wondering if the two on the left aren't coticules. If you have it to spare, I wouldn't blame you if you went for it. You will get your money's worth in entertainment value at least. You will spend hours just lapping those rocks and giving them a go. Right, the razor isn't worth anything but yeah you can rub it on a rock and study scratches, at least. Meh. I would go for it. I have always liked cheap.
My 2 cents,, i say no
Recommend buying from rep recommended vendor or seller
Stones could damaged a razor especially if not made for razors and especially if not flat smooth for honing
Nothing in pics peep my interest
I have 2 jnats that have their own description pages on web and purchased from amazing vendors and are verifiable stones and work flawlessly
Worth paying and getting a good stone
Yes. Use it. Observe the scratch patterns. How fast or slow it cuts. Some stones can tear an edge up. My routine on a new stone is to do 100 half strokes on an expendible razor and see. Feel for resistance and how scratchy it feels. Look at the edge. If you develop an even scratch pattern then you look at the edge and see where in the progression the stone fits. If it's very fine we'll the stone is very fine. If the lines are coarse then it's a lower grit. It isn't rocket science. Testing them against known synthetics will give you a more accurate understanding of what the stone can do. Many stones are.made for tools. Most stones aren't made for razors as most tools.dont require that refined an edge. Push cutting is vegetable chopping and shaving. You need a refined edge to do that. Toothy edge tools generally excel at slicing tasks.Is there any way I can test a random stone if it's good enough for straight razors?
Damage the razor? If the stones are lapped and used judiciously I don't see any harm coming from them. Anyway he has a perfect guinea pig in the worn out beater razor that comes with them. $25. If I had time on my hands I would jump right in there and snag that myself. Or maybe not. I got enough rocks that I don't use already. But still, $25. I have spent more than that on a lot of useless or even harmful stuff.My 2 cents,, i say no
Recommend buying from rep recommended vendor or seller
Stones could damaged a razor especially if not made for razors and especially if not flat smooth for honing
Nothing in pics peep my interest
I have 2 jnats that have their own description pages on web and purchased from amazing vendors and are verifiable stones and work flawlessly
Worth paying and getting a good stone