The World’s Rarest Mineral Is So Uncommon It Has Only Been Discovered Once
The world's only known specimen of kyawthuite. (Kampf et al., Mineral. Mag., 2017)A mineral so rare that only one specimen has ever been found in the world exists: kyawthuite (cha-too-ite). This tiny, tawny-hued grain weighs just a third of a gram (1.61 carats), and at first glance, it might resemble amber or topaz. However, its...