The Collaborative International Dictionary
Chlorite slate
Chlorite \Chlo"rite\, n. [Gr. ? (sc. ?), fr. chlwro`s light green.] (Min.) The name of a group of minerals, usually of a green color and micaceous to granular in structure. They are hydrous silicates of alumina, iron, and magnesia.
Chlorite slate, a schistose or slaty rock consisting of alumina, iron, and magnesia.