At my local city park...thumbed the discrim, as slingshot said in his posts. Nice, short, repeatable tone well past 1c/zinc. Was only 2" down. 14k; purple stones are amethyst, yes? Prob not worth much, but tons o' fun to find! Funny, as a guy told me in passing yesterday that this park is hunted hard, and there is "nothing" left to find...yeah, whatever...