This could be a one of stone... @cotedupy recently got something similar with ice caps.. I've never seen anything like it specifically. 99.999% certain it's novaculite, really translucent in sunlight. I'm pretty sure its a very old washita stone that had a holder made by the next generation(pre electricity) but it's really hard and super fine with a light touch(very coarse with pressure, i.e. washita) but it's the finest washita I've ever seen and didn't realize until an hour ago. It hasn't gotten a razor yet but I feel she may soon.