Hi everyone I've enjoyed all your info you've givin, but need to ask how to tell the difference between the blue and green copper and turquoise, I was told if you put the rock to your tongue turquoise will stick to your tongue and copper will not. I found a buried outcropping of copper after busting thru the peacock copper layer it started turning blues and greens,,some of the blue at the bottom of the hole I've been busting down to will actually stick to your tongue and pull your tongue with it as you pull it away..This is a very well known turquoise area in the state ( well close to one anyway) in mineral county Nevada. I'm hoping it is turquoise and hoping the veining gets a bit thicker. Your help would be appreciated..TY