I found the answer to this on my own. Having never played with Jungle Adventure or the archaeology table before, I didn't realize that refined crystals went into the household inventory instead of the Sim's personal inventory. This seems really inconvenient while on vacation in Selvadorado. Fortunately, I found a LittleMsSam mod that allows the crystals to go into the personal inventory. It's the Small Archaeology Overhaul mod. Hopefully this will help someone else who is playing the pack for the first time.
