Citation: Biagioni, C.; Bonaccorsi, E.; Perchiazzi, N.; Halenius, U.; Zaccarini, F. (2020). Derbylite and graeserite from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy: occurrence and crystal-chemistry Note: Sample G. Mineralogical Magazine, 84, pp. 766-777.