The prevalent textural terms useful for rock forms with respect to the scale in the grains or crystals, are given inside the Desk. The particle-measurement classes are derived from the Udden-Wentworth scale formulated for sediment. For igneous and metamorphic rocks, the terms are normally made use of as modifiers— Minerals https://socialclubfm.com/story2495477/everything-about-rocks-and-minerals-for-kids