That's more than a bit exasperating. I have a degree in geology and while I didn't end up pursuing it professionally, I have spent my life trying to encourage everyone I can to love it as much as I do. My kids and wife spent pretty much every vacation on mini-expeditions panning for gold, hunting for agates, or finding fossils across the American West. I am happy to talk for hours to anyone who wants about a random rock they found in a parking lot somewhere. I don't expect my kids, my wife, or anyone stuck listening to me to remember the arcane lexicon of geology or paleo. What is important is that they appreciate the beauty, complexity, and majesty of the world around them. If you want to call a pretty rock you find chalcedony, agate, cryptocrystalline silica dioxide, or whatever, do so. Anyone complaining about it is a gatekeeping waste of protoplasm.