Sasyaka, also known as tuttha or blue vitriol, is the 6th mineral drug in the maharasa group. It is chemically identified as copper sulfate with the chemical formula CuSO4. The document discusses the various Sanskrit and regional names of sasyaka, its natural occurrences, mineralogical identification, historical references, types, purification process, therapeutic properties and uses when consumed in its purified or bhasma form. It describes how sasyaka bhasma is useful for treating diseases like kushta, netraroga and various skin disorders.