*# '''Lithic fragments''': are pieces of ancient source rock that have yet to weather away to individual mineral grains. Lithic grains may be any fine-grained or coarse- grained [[igneous]], metamorphic, or sedimentary rock. Although, the most commonly they are clasts of volcanic rocks. | *# '''Lithic fragments''': are pieces of ancient source rock that have yet to weather away to individual mineral grains. Lithic grains may be any fine-grained or coarse- grained [[igneous]], metamorphic, or sedimentary rock. Although, the most commonly they are clasts of volcanic rocks. |