This funny t-shirt has not one, but two, punny geologist jokes screen-printed on the front! For those of you out-of-the-loop, both “gneiss” and “chert” are both types of rocks and are pronounced “nice” and “shirt” respectively. These are pretty common rock names, so even rookie rockhounds will get the joke and they’ll be sure to get more than a few laughs at the local meet-ups, digs, or expos. With a variety of color and size options, you’re sure to find the perfect “chert” for the rockhound in your life.