Well it does look like some of the silver ore I've seen and even pulled right out of the deposits myself. At least the color is similar, but being its only a picture your gonna need to have it looked at by someone in person who can say for sure what it is. Take it to a rock shop and see what they think it might be. There are a lot of folks in AZ who have knowledge on all kinds of rocks and minerals that may be able to say what you might have.