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Copper pyrites, or yellow copper ore; a common ore of opper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.

also copiapite. -- Yellow copper ore, a sulphide of copper and iron; copper pyrites. See Chalcopyrite. -- Yellow cress (Bot.), a yellow-flowered, cruciferous plant (Barbarea præcox), sometimes grown as a salad plant. -- Yellow dock. (Bot.) See the Note under Dock. -- Yellow earth, a yellowish clay, colored by iron,…