chapter  3
Physical and Mechanical Properties of Rocks, Soils, and Coals
Pages 26

In geology, rocks occur as a solid aggregate of minerals, connected by strong and permanent cohesive forces, and classified according to their origin: igneous, sedimentary, and metamorphic. The major three groups of rocks are subdivided into many groups, and petrology is the scientific study of the rocks. The minerals, grains, and microscopic properties of the rocks give some important information about the rock such as strength, abrasivity, hardness, drillability, and cuttability. In this section, these properties and the methodology of applying the tests will be explained.