On 25 February 2025, the Faculty of Geo-resources and Geotechnical Engineering (GGE) at the Institute of Technology of Cambodia (ITC) organized a sharing workshop on the alteration of Angkor stones and sandstone formation in Kbal Spean, Siem Reap. We greatly appreciate Dr. Tann Bounsuy, the former Deputy Director of the National Apsara Authority, and Dr. Sio Sreymean, a lecturer at GGE-ITC, for generously sharing their expertise and knowledge with our GGE students and student