![]() Some igneous rocks have also formed by some type of settling or accumulation, such as settling or other accumulation in a magma chamber. Although we are not going to be considering size of particles in this lesson, the size of the clastic particles is a major criterion for naming of detrital sedimentary rocks. This texture is typical of detrital sedimentary rocks. Grains often have an interlocking and space filling quality that differs from the way that grains look if they have been gravity-deposited from water, for example.Ĭlastic (or Detrital): This refers to a texture in which the constituents are "stacked together" as they were deposited by settling. ![]() It is a common texture in igneous rocks, although this word might also be used to describe the texture of some chemical sedimentary rocks, such as evaporites that have crystallized from water. The textures we are going to consider are the following.Ĭrystalline: This refers the a texture in which the different constituents have crystallized together from a liquid state. We are going to be looking at only a few basic textures and thinking about what they tell us. There are many important textures to consider when examining a rock-you might review some of these online by searching on terms like "igneous rock textures", "metamorphic rock textures", and "sedimentary rock textures." Texture refers the the size, shape, and arrangement of the constituents that make up a rock. We will also identify (name) a few common rock types based on their mineralogy and texture. In Part 2 we are going to look at a few basic textures and think about the stories that they tell us of the rock's formation. In Part 1 of these thin section exercises we practiced using a polarizing petrographic microscope and got some experience identifying a small set of common rock-forming minerals. Photomicrograph of zoned euhedral feldspar in aphanitc matrix under crossed Nicols. Mineralogy-Petrology-Thin Sections Part 2-Textures
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