shale [shales](sedimentary rock) noun [UK: ʃeɪl] [US: ˈʃeɪl]Shale rock is a sedimentary rock made up of clay, compacted together by pressure. = Lo scisto è una roccia sedimentaria composta da argilla, compattata dalla pressione.
scisto bituminoso noun {m}
oil shale(shale from which hydrocarbons can be produced) noun