argilloferruginous

Containing alumina or clay in combination with iron. [FERRUGINOUs.) In Phillips' Mineralogy , 2nd ed. (1819), there figures among the varieties of limestone one, the third in order, called argillo - terruginous limestone. Under it are included Calp, Aberthaw limestone, and blue and white lias. These are now looked at almost exclusively from the geological point of view, and are arranged not according to their chemical composition, but according to their relative ages as ascertained by their stratigraphical position and their fo il re mains. * argillo-murite, s. [In Ger. argillo murit ; from Lat. (1) argillo and (2) muria = brme, salt water.] Old Min.: A variety of Magnesite not now recognized.