The Leonides family all live together in a not-so-little crooked house. Which one of them poisoned the patriarch, Aristides, and why his late wife’s rose Quartz necklace is missing? Quartz is one of the most well-known minerals on Earth. It is also the most varied of all minerals, occurring in all different forms, habits, and colors. Indeed, more variety names have been given to Quartz than to any other stone.