This atlas features compilation of over 600 microscopic images taken between 2019 and 2021 while the authors were developing methodology of using reflected light microscopy in identification of charcoal-based grilling fuels constituents. These photomicrographs provide documentation of the composition of the fuels and demonstrate the array of impurities that can be present. As such, this atlas is a valuable source of information for anyone interested in grilling, pellet fuels, optical microscopy, and quality assessment techniques. See the atlas introductory text and component classification at: Drobniak, A., Jelonek, Z., Mastalerz, M., Jelonek, I., 2021, Atlas of Charcoal-Based Grilling Fuel Components: Indiana Geological and Water Survey, Indiana Journal of Earth Sciences, v. 3, https://doi.org/10.14434/ijes.v3i1.32559.
