But, before we go any further, we want anyone who finds a really nice geode to know that museum-quality geodes are sold in the collector market for prices that will astound the average person. The Arkenstone, a business that specializes in museum-quality mineral specimens, usually has a few nice geodes for sale. At the time this article was being written, they were selling rare-mineral lined geodes featuring volkovskite, millerite, thomsonite, and shattuckite for four- and five-digit prices.