Hey folks, A little background info first. I just moved out to Arizona from the east coast and for the past few months I have been living at my house Ive noticed a large rock in the front yard. I never really looked at it and kinda put it off as well... a rock. Upon closer inspection I realized this is no ordinary rock but it someones what i would assume to be a work in progress as its polished and theres a large cut mark on the back. Im not sure if this is local to Arizona or was brought from somewhere else. Hoping someone can help me identify this "rock" and perhaps tell me what kind of val