Physicists Identify First Unconventional Superconductor with Composition Also Found in Nature. Physicists at Ames National Laboratory have found compelling evidence of unconventional superconductivity in synthetic samples of Rh17S15, which is also found in nature as the mineral miassite.
Source: sci.news
https://www.sci.news/physics/unconventional-superconductor-miassite-12764.html