What particle size is generally implied when a geologist uses the term 'grain' instead of 'clast'?
Answer
Sand-sized fragments
While often used interchangeably with clast, the term grain generally implies a smaller particle size, commonly associated with fragments the size of sand.

Related Questions
What is the general geological term for any broken piece of rock or mineral found in a sedimentary setting?What particle size is generally implied when a geologist uses the term 'grain' instead of 'clast'?On what primary physical characteristic are clastic sedimentary rocks fundamentally classified?According to the provided size guide, what approximate size range defines fragments classified as Sand?What is a fragment called if it is composed of multiple interlocking mineral grains from an original parent rock?If a sandstone is rich in lithic fragments instead of individual mineral grains, what does this suggest about the source area?Which term describes a coarse clastic rock composed of fragments that possess sharp, jagged edges?What process is necessary for angular clasts to become the rounded fragments found in a conglomerate?What general term is sometimes used for any coarse-grained clastic rock, encompassing both conglomerates and breccias?What is the term for pieces of rock ejected during a volcanic eruption that compose rocks like tuff?The comprehensive identification of grain size, angularity, and lithic type is used to determine what aspect of the sedimentary material?