Twenty years ago, most people relegated tourmaline to the “accessories” category and ignored it in petrological analyses. This view has since changed dramatically, and tourmaline is now widely used as an extraordinary archive of petrologic processes and host-rock formation conditions, allowing for element sources, temperature, pressure, fluid composition, pH, and provenance to be constrained. Although this transformation was already underway in 1997, the first Tourmaline Conference (June 1997)—organized by Milan Novák (Moravian Museum; Masaryk University, Czech Republic) and Frank Hawthorne (University of Manitoba, Canada)—acted as a catalyst. This meeting brought together an international group of scientists to discuss tourma-line research...

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