Dear Colleagues, We would like to draw your attention to the session on “/The Petrology of Accessory Minerals: from the Ubiquitous to the Exotic/” to be held at the 4th European Mineralogical Conference in Dublin, 18-23 August 2024 ( https://emc-2024.org/ ). Abstract submission deadline: *22nd March 2024*. *The Petrology of Accessory Minerals: from the Ubiquitous to the Exotic* Conveners: Callum J. Hetherington, Ewa Słaby, Bartosz Budzyń *Keynote speaker:* Claire Corkhill (the School of Earth Sciences at the University of Bristol) Accessory mineral petrology is a well-established field of Earth Sciences contributing to the understanding of processes across diverse geologic environments, and on scales from nanometer to the planetary. With perpetual improvements in analytical methods, increased understanding of trace element behavior between rock-forming and accessory minerals, knowledge of isotope systems, and novel approaches in experimental petrology, researchers are continually expanding the range of minerals that we leverage to understand rock-forming processes. This session seeks contributions from practitioners of accessory-mineral science to understanding geologic processes and welcomes those making contributions to improving our understanding of minerals ranging from the better known and ubiquitous minerals (e.g. zircon, monazite, apatite), to the more exotic, less common phases that have more limited occurrence, and perhaps unique attributes (e.g. small windows of stability) or compositions (e.g. Nb-Ta-phases, REE-fluorides and carbonates, metal-oxides). Accessory minerals continue to have far-reaching applications for understanding igneous, metamorphic and hydrothermal systems, as well as contributing to understanding tectonics and sedimentary systems (provenance as well as rates and tempos), and ore-forming processes, and we encourage submissions that contribute to broadening the understanding of crustal processes. Kind regards, Callum, Ewa and Bartek -- Bartosz Budzyń Institute of Geological Sciences Polish Academy of Sciences Kraków Research Centre Senacka 1 31-002 Kraków, Poland orcid.org/0000-0002-1186-0888 https://www.ing.pan.pl/en/staff/bartosz-budzyn