The common textural conditions utilized for rock varieties with respect to the dimensions of the grains or crystals, are specified within the Table. The particle-dimensions classes are derived from the Udden-Wentworth scale developed for sediment. For igneous and metamorphic rocks, the conditions are usually made use of as modifiers— There's https://www.generationgenius.com/videolessons/rocks-and-minerals-video-for-kids/