A really pretty chunk of serpentine from cali! More specifically Bagby CA very close to the jade deposits. It's a very soft material so be lighter and spend some more time getting scratches out. Higher grits may be needed to get a nice polish
Can be used for 
Untreated and unpolished. Photos shown wet. 
If there are any concerns regarding the product or your purchase please get a hold of me ASAP and I will find a solution for you.