Posted on August 31, 2018 GeoCon 3 Comments Pic of the day #36 (Rock fabric) Pic src: Earth structure – An introduction to structural geology and tectonics Left figure: The basic categories of fabrics. (a) A random fabric. The fabric elements are dark, elongate crystals. The long axes of these crystals are not parallel to one another. (b) A (1-dimensional) preferred fabric, in which the long axes of elongate crystals are aligned with one another. (c) A foliation. The fabric elements are planar and essentially parallel to one another, creating a 2-dimensional fabric. (d) A lineation. The fabric elements are linear; in this example, we show the alignment of fabric elements in a single plane. Right figure: The distinction between continuous and spaced fabrics. (a) A continuous fabric. The lines represent a planar fabric element that continues to be visible no matter how small your field of view (at least down to the scale of individual grains). (b) A spaced fabric. The rock between the fabric elements does not contain the fabric. The circled areas represent enlarged views.