A rare arsenic sulfide mineral that forms in specific geological conditions, named after French mineralogist Ours-Pierre Dufrenoy.
This mineral name combines the geologist's surname 'Dufrenoy' with the standard mineral suffix '-site' (variant of '-ite'). It was named in honor of Dufrenoy's extensive work documenting and classifying minerals in the 19th century.
This mineral is so rare that most people will never see it, yet it has an exact scientific name that's recognized worldwide. It's a beautiful example of how science creates universal naming systems so that a geologist in Japan and one in Brazil can discuss the exact same mineral using the same word.
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