Young Brunette Girl Shows Off Outside On Sedimentary Rocks

- rounding describes the general smoothness of the shape of a grain.
- 'Sphericity' describes the degree to which the grain approaches a sphere.
- 'Grain form' describes the three dimensional shape of the grain.
Chemical sedimentary rocks have a non-clastic texture, consisting entirely of crystals. To describe such a texture only the average size of the crystals and the fabric are necessary.