This laboratory course covers visible light, electron, and x-ray microscopic methods for the characterization of concrete and geo-materials, including methods of sample preparation. Topics include fluorescent dye impregnation to characterize cracks/grain boundaries/pores, chemical staining procedures, image and quantitative chemical analysis using free software packages (ImageJ, MultiSpec, and DTSA-II). After taking this course students will be able to take a geologic or concrete sample through the entire process of stabilization, preparation (cutting, grinding, polishing), and examination by microscopic methods.