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 ...
It is the rarest mineral known to science, with only a single specimen ever discovered. The only sample found thus far, weighing a mere 1.61 carats (0.3 grams), has sparked immense intrigue among ...