This document provides information about minerals and methods for studying their properties. It defines a mineral as a naturally occurring inorganic solid with specific physical properties and a definite chemical composition. Common rock-forming and economic minerals are described. The importance of mineralogy for civil engineering applications is outlined. Methods for studying minerals include examining their physical, chemical, optical, and atomic properties. Key physical properties discussed include form, color, streak, luster, fracture, cleavage, hardness, density, and transparency.