Oregon's state rock is celebrating its 60th anniversary this year. Here's everything to know about the thunderegg and where ...

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 ...

Pure quartz, or “rock crystal” from Brazil ... generating steam that gradually increases the pressure inside the chamber. Convection causes the process fluid to flow up through the chamber ...