Dimmitt is an H3.7 Ordinary Chondrite found near Dimmitt in Castro County, Texas, USA, in 1942. It is a substantial American meteorite find, with around 200 kg of material recovered from many stones. As an H Chondrite, Dimmitt contains relatively high iron compared with L and LL Chondrites, while its type 3.7 classification makes it especially interesting because it preserves more primitive Chondritic textures than more equilibrated H5 or H6 material.

Dimmitt specimens are known for their regolith breccia structure, containing a mixture of clasts from the surface of its parent asteroid. Many pieces show visible chondrules, metal grains, and a dark clastic matrix, with some material including both relatively primitive and more equilibrated components. Published descriptions list Dimmitt as H3.7, shock stage S3, and weathering grade W4, reflecting both pre-terrestrial impact history and long terrestrial exposure after landing.

Studying Dimmitt provides valuable insight into the surface processes of the H Chondrite parent body, including impact mixing, regolith development, and the preservation of primitive material. For collectors, Dimmitt offers a recognised Texas meteorite with strong American provenance, large recovered mass, and an appealing unequilibrated classification. Each specimen represents ancient asteroid material formed over 4.5 billion years ago, preserving evidence from the early solar system and the disturbed surface of its parent body.