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It's going to be an extremely nice looking hone when you get it lapped, whatever it is made out of. BTW, if quartz will scratch it, it is probably not a translucent Arkansas, but it sure looks like...

Yeah, don't destroy your DMT on that stone! Probably has a Moh hardness of at least 7, and is way thick. Maybe you could get things started by laying pieces of 120 grit wet/dry sandpaper on a flat...

Looks like a translucent Arkansas to me. Lapping it may be a job for that yellow powder discussed in another thread! Should clean up very pretty like a huge block of semi-precious gem. Have you tried...