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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.
Quartz Quartz is the most abundant mineral in the crust. It has many useful properties. Fluorescent Minerals Fluorescent Minerals glow with spectacular colors under ultraviolet light. Mineral Hardness Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.Diamond: The Mineral Diamond is a mineral with unique properties and many gem and industrial uses! Fee Mining Find Minerals and Gems Dozens of sites where you can dig and keep what you find.U.S. Gemstones United States Gemstones Small mines in the U.S. produce a diversity of gemstones.ses of Gold Gold has unique properties that make it one of the most useful minerals. Rhodochrosite Rhodochrosite: a manganese mineral used as an ore, a pink gem and an ornamental stone. Herkimer Diamonds Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.