what are the rarest minerals on earth
What is the second rarest element on Earth? The second rarest element on Earth is unstable so it does not have a long life (22min.), but uranium is the rarest natural element and is the second heavist natural element. â¦ Actually, there are even rarer elements that last for less then fractions of a second.Some are so rare that they haven't even been discovered. people found this useful. The second rarest element on Earth is unstable so it does not have a long life (22min.), but uranium is the rarest natural element and is the second heavist natural element. â¦ Actually, there are even rarer elements that last for less then fractions of a second.