Copper Stained Agate with Tip. The other day, Denny & I went out to a river in Oregon to do some rockhounding. As usual, I look in spots most people don't ever look - under bushes, under rocks, in shady areas. This time, I scored a beautiful Copper Stained agate about the size of my palm! To say I got an adrenaline rush would be a BIG understatement!! I was jazzed!!