Use it as rough finger stone for polishing knife body.
How about gluing it to a wooden base? Those cracks will remain of course, but I believe if glued accurately they might not affect sharpening.
Use it as a nagura.
Starting this harvest I'm a starving startling artist/
Lyrical arsonist it's arduous spitting this smartest arsenic/
Might make nice coasters
Rule #1- Don't sweat the small s%&t, rule #2- It's ALL small s%&t