Final answer:
The properties of grains that determine the texture of rocks are size, shape, and composition.
Step-by-step explanation:
The properties of grains that determine the texture of rocks are size, shape, and composition. Grain size refers to the size of individual grains in a rock, which can range from fine to coarse-grained. Grain shape refers to the shape of individual grains, which can be angular, rounded, or other shapes. Composition refers to the mineral composition of the grains in a rock, which can vary and impact the overall texture.