Yu Yuliang. The Chinese medicine name is Yu Yuliang yuyuliang. It is also known as Yuliang stone, Taiyi Yuliang, Shizhonghuang, Yuliangshi, and Yuliangtu. .

The English name is Limonitum. .Medicinal parts of the hydroxide mineral Limonite ore. .Distributed mainly in Henan and Jiangsu; also produced in Zhejiang, Sichuan, Guangdong and other places. . Harvesting and processing can be carried out all year round, and sediment and impurities are removed after digging. .When encountering ovoid bodies, do not break them to prevent the limonite powder inside from being lost or contaminated. .The properties of medicinal materials are irregular and diagonal, often in the shape of hollow or solid nodules or stalactites. .