Here's why:
* Pigments are colorants: Pigments are substances that give color to a material. They don't influence the physical structure of the rock.
* Texture is determined by grain size and arrangement: A rock's texture refers to the size, shape, and arrangement of its mineral grains. This is determined by the rock's formation process, not its color.
* Example: Granite and basalt can have similar colors but vastly different textures due to their distinct mineral compositions and formation processes. Granite is coarse-grained with large crystals, while basalt is fine-grained with smaller crystals.
In summary: Rock pigments determine color, while the rock's texture is determined by the size and arrangement of its mineral grains.
