Minerals and Metals in Ancient India v2.c44.s6.28

v2.c44.s6.28

Govindabhagavat wrote *Rasahṛdaya* (*RHR*) in the eleventh century AD at the request of the king of the Kirataland, i.e., the region adjoining the modern Bhutan. He mentioned eight *rasas* including *vaikrānta* (tourmaline?), *kānta* (a kind of iron); eight *uparasas* such as *kankustha* (magnesium and sodium sulphate, a purgative); six salts including *sauvarchala* (saltpetre), *chulika* (sal ammoniac), *romaka* etc.