The document discusses construction materials and methods, focusing on building stones. It provides an outline that covers the introduction, classification of rocks, properties of good building stones, types of building stones, uses of common building stones, quarrying and dressing of stones, durability and selection of stones. It classifies rocks geologically into igneous rocks formed by cooling magma, sedimentary rocks formed from compressed sediments, and metamorphic rocks formed from changes to sedimentary and igneous rocks. Igneous rocks are further classified by crystal size, sedimentary rocks include limestone and sandstone, and metamorphic rocks include gneiss, schist and slate. Rocks are also physically classified by