This document summarizes key concepts about minerals from the Earth's crust. It discusses that minerals are naturally occurring inorganic solids with crystalline structures composed of elements or compounds. It also outlines the different crystal classes and types of minerals such as silicate and non-silicate minerals. Furthermore, it identifies several properties used to identify minerals including color, luster, cleavage, fracture, hardness, density, and special properties like fluorescence or radioactivity. Finally, it briefly discusses the formation of ores, and mining methods like surface and deep mining along with the process of land reclamation after mining.