This collection honoring Professor Jiann-Yang Hwang focuses on characterization and processing development in minerals, metals, and materials. Topics include but are not limited to:• Characterization methodology of minerals, metals, and materials• Microwave-assisted material processes• Recycling and reuse of metallurgical byproducts• Materials for hydrogen storage• Wastewater treatment and environmental protection• Natural materials for value-added applications• Principles and interactions of material characterization and manufacturing processing