In the ebay auction for this stone it appeared to be a blue stone with an oily surface. I knew it could be pretty much anything beneath the surface but I wasn't expecting lapping would reveal a white stone. It measures 14.8 x 4.9 x 2.5 cm and the slurry is white. I've only finished the first stage of lapping, I got tired because this stone is hard.
It feels as smooth as my Guangxi to the touch so I'm looking forward to test it.
Does anyone have an idea what this could be?