That assumption is particularly true of clay deposits found in crater central peaks. (sciencedaily.com)
As for the ammonia - rich clay deposits, they provide evidence that Ceres may have originally formed farther out in the Solar System and then migrated inward to where it is now in the main asteroid belt. (americaspace.com)
Australia Minerals and Mining Group has chosen its Meckering aluminous clay deposit as the key supply of feedstock material for its HPA chemicals project, which will be located north of Perth. (businessnews.com.au)