Dear community, We cordially invite you to submit an abstract to AsCA (Asian Crystallographic Association) 2025 sessions related to crystallography, mineralogy, phase transitions, physical properties, and various experimental and computational techniques. For full details, please visit: https://asca2025.org/page/12 This invitation particularly highlights the following microsymposia: - *MS2-4*: *Minerals and inorganic materials* - *MS2-5*: *Polymorphism, co-crystals, and solid-state phase transitions* - *MS3-2*: *Phase transition: from static to dynamic phenomena of quantum materials* - *MS3-3:* *Electronic structures as seen by X-ray and electron diffraction* - *MS3-4: **Special measurement technique: extreme condition, time-resolved, in-situ measurement* - *MS4-2*: *Materials from the solar system and beyond* - *MS4-5*:* Interdisciplinary approach for disorder and short-range order in materials* - *MS5-1*: *X-ray free electron lasers: techniques and applications* - *MS5-2*: *Quantum crystallography covering experimental and computational works* - *MS5-4*: *Advances in synchrotron and neutron sciences* These sessions span a wide range of cutting-edge topics in crystallography and materials science, with particular relevance to the mineralogical and geoscience communities. We welcome contributions involving the crystallography and spectroscopy of minerals and inorganic materials, solid-state phase transitions, and structural evolution under extreme conditions. Several sessions highlight experimental breakthroughs using synchrotron, neutron, and X-ray free electron laser techniques, as well as emerging computational and quantum crystallographic approaches. Topics include vibrational and electronic properties, disorder and short-range order, planetary materials, and dynamic structural phenomena across scales and environments. AsCA 2025 will take place in Taipei, Taiwan, from December 1 to 5, 2025. The abstract submission deadline is *1 August 2025*. Link to the submission portal: https://asca2025.org/page/15 We look forward to your contributions and hope to see you in Taipei. Best regards, *Jennifer Kung* On behalf of the Host Organization -- Jennifer Kung (龔慧貞) Department of Earth Sciences National Cheng Kung University 1 University Road, Tainan 70101 Taiwan E-mail: jkung@mail.ncku.edu.tw Tel: 886-6-2757575 X 65434 Fax:886-6-2740285