Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and ...

Rather than a single rock bursting with crystals, the Guinness Book of World Records names the entire Crystal Cave, which is 35 feet at its widest point and 10 feet high, as the largest single ...