nephrite

Hi! I was told this rock found on my river bank (PNW)looks like it may be jade. What do you think? Is there any way to confirm whether or not it is? -attached some pics of it both dry and wet if that helps at all Thank for your help!

While arrowhead hunting, I came across this smooth, black, semi-shiny rock, that I originally picked up as a meteowrong. At first I didn't know if the smooth black surface was fusion crust, and didn't see obvious any regmaglypts, but upon handling the stone thats size and shape are almost...