I have an opalised split & polished ammonite which is worth آ$600, a massive amethyst geode which is currently being used to hang my t-shirt on... that's worth about آ$200ish, a fair amount of other rocks and crystals in the آ$50-150 range. And tonnes of them valued between آ$1-50. A lot of my rocks I've collected myself from Charmouth, Whitby, Isle of Wight, and a quarry near my home in Peterborough. I've sold around 19 fossils I found so far getting around آ$15-30 each for them.