The Materia Medica of the Hindus, compiled from Sanskrit Medical Works c4.s13.t1.4

c4.s13.t1.4

स्रोतोञ्जन Srotonjana is described as of white colour, and is said to be produced in the bed of the Jamuná and other rivers. It is called saffed surmá in the vernacular, and the article supplied under this name by Hindustani medicine vendors is calcareous or Iceland spar. It is used as a collyrium for the eyes, but is considered inferior to the black surmá or galena.