Help ID this purple/burgundy hone

I picked this up recently, it was dirty as all get out so I lapped it down a bit to see what it was. This is unlike any of the stones in my collection. It is a rich purple/burgundy color.It has a bit coarser texture than the slate stones I have been playing with, if anyone has any idea what this is I'd love to hear it.

I have posted on SRP in a LONG time, been away before I ever really got hooked on razors but I am an avid collector of sharpening stones and this here is one of the only places on the net where folks actively discuss stones and know what some of the more off the wall stones are. 99% of the people I talk to only know Arkansas (I'm mainly a knife guy), and some have heard of Japanese water stones but that's about it. Anyway I digress, if you folks care to share your knowledge I'd love to hear it!

Looks like my Belgian Blue Waterstone, affectionately known as a BBW. About 4k grit. It's the poor cousin of the Belgian coticule. Mined in the same place. Not quite a razor finisher, but fine for knives. A bit slow cutting without slurry.

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Originally Posted by cau

Looks like my Belgian Blue Waterstone, affectionately known as a BBW. About 4k grit. It's the poor cousin of the Belgian coticule. Mined in the same place. Not quite a razor finisher, but fine for knives. A bit slow cutting without slurry.

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Did a google image search for belgian blue waterstone and I believe you are spot on, color and grain looks identical to this one. Thank you for your help!