We found agates at Furnace Bay CG in the UP and along the north shore of Lake Superior, had to free dive to find them and the water is cold. Not too far from you are Herkimer Diamonds in Herkimer NY which are quartz's crystals, took GS there several years ago he had fun finding them. Also close are garnets in CT, smoky quarts crystals in NH wht mtn nat NF, and amethysts just over the border in ME. Found a few crystals in Quartsite but you really need to know where to go, or else buy them at the gem shows. I am not a rock hound and don't go out of my way to look for them, just a few places that I stumble across.