There's a mineral so rare that only one specimen of it has ever been found in the entire world. It's called kyawthuite ( cha-too-ite ), a tiny, tawny-hued grain weighing just a third of a gram (1.61 ...
For example, jadeite is the hardest natural mineral, and painite is the second-rarest mineral in the world. The rarest mineral in the world is kyawthuite (Photo: mindat) Cost of kyawthuite The ...