Geomaterials, or geologically derived materials, are of enormous economic importance to the global construction industry. If you are a geologist or petrographer who provides consultation to architects, civil engineers, and construction engineers, you must have the knowledge and expertise of the features and applications of geomaterials to provide accurate and safe recommendations. This is the first guide to the petrography of geomaterials, making the petrographer's specialist knowledge available to you in a single source. More than 350 full-color and captioned photos provide concise explanations of petrographic properties of geomaterials and how to interpret them--arming you with the tools to identify the highest quality geomaterials and how they are used in the construction industry.