紅こう鉛えん鉱こうMeanings1nouncrocoite; red lead oremineralogy›A mineral consisting of lead chromate, typically bright red or orange. Technical term used in mineralogy.紅こう鉛えん鉱こうはクロム酸さん鉛なまりからなる鉱こう物ぶつです。Crocoite is a mineral composed of lead chromate.