argillaceous

Word origin

From Latin argillaceus, from argilla (“clay”), from Ancient Greek ἄργιλλος (árgillos, “white clay, potter's earth”), from ἀργός (argós, “white”).

Used in a sentence

• “[…] natural colossi from two to five hundred feet high, done in argillaceous sandstone or a singular species of conglomerate, all of which owe their existence almost entirely to the agency of wind.”

• “The gleam of the land is in its rocks, the fine-grained argillaceous rocks, here, not purple or grey, but green of living stone.”

Source: Wiktionary, CC BY-SA 4.0