Kendleton has been classified as an L4 fragmental regolith breccia with a Shock Rating of S3. Regolith breccias are fragmental rocks that contain implanted solar-wind gases and are widely believed to have formed by lithification [the process or processes by which unconsolidated materials are converted into coherent solid rock, as by compaction] of regolith material that once resided at the surface of a body (Taylor & Wilkening, 1982). About 80% of the Kendleton meteorite consists of a dark chondritic type-4 matrix with at least four other types of light & dark coloured clasts. These include light-coloured type-5 clasts with less-defined chondrules than the type-4 host matrix, along with light-coloured primitive type-3 clasts which are likely L3.5.

Kendleton also contains shock-blackened and melt-rock clasts. The shock-blackened clasts were produced in post-metamorphic impacts, while the melt-rock clasts were formed before the end of metamorphism. The shock-blackened clasts are angular to irregularly shaped with sharp to diffuse boundaries. They consist of faint, isolated to grouped chondrules; shock-melted Iron/Nickel (Fe/Ni) & Troilite (FeS); glassy material and olivines & pyroxenes. A unique tridymite-rich inclusion was also found during studies which are believed to originate from the H-Chondrite parent-body due its matching oxygen isotope. However since they've not been found in H-Chondrites, a different origin is assumed. It was described as an inclusion and not a clast because there was no textural evidence that it was broken from a pre-existing rock although given its relatively large size, this is likely.