How are chemical rocks identified, and how does this differ from how detrital rocks are identified? how are chemical rocks identified, and how does this differ from how detrital rocks are identified? chemical rocks are primarily identified based on their particle sizes, whereas detrital rocks are primarily identified based on their compositions. chemical rocks are primarily identified based on the minerals they are composed of, whereas detrital rocks are primarily identified based on their grain sorting. chemical rocks are primarily identified by their compositions, whereas detrital rocks are identified primarily by their grain rounding. chemical rocks are primarily identified based on their compositions, whereas detrital rocks are primarily identified based on their particle sizes. chemical rocks are primarily identified by their overall textures, whereas detrital rocks are primarily identified by their compositions.