Robuta

https://www.usgs.gov/publications/origin-placer-laurite-borneo-se-and-contents-and-s-isotopic-compositions Origin of placer laurite from Borneo: Se and As contents, and S isotopic compositions | U.S.... We examined grains of the platinum-group mineral, laurite (RuS2), from the type locality, Pontyn River, Tanah Laut, Borneo, and from the Tambanio River,...