According to Mayo (1932), who provided a brief historical review of the names used for piemontite, the first researcher who described this mineral has been Cronstedt in 1758 who named it “röd Magnesia.” In 1790 Chevalier Napione analyzed the sample described by Cronstedt and termed it “Manganèse rouge.” On the basis of his chemical data Haüy designated the substance as “Manganèse oxidé violet silicifère” in 1801. Later, in his Traité de Mineralogie, Haüy (1822) adopted the name proposed by Cordier (1803) who first recognized the mineral as an “Èpidote manganésifere.” The name piedmontite was proposed in 1853 by Kenngott...

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