The most common addition is calcinied ash of purified Swarna Makshik which in modern terms is Chalcopyrite.
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Sutshekhar Rasa as per its preparation methods contains "purified" mineral compounds like Swarna Makshik (Chalcopyrite), Shankh (conch shell) and heavy metals like Swarna (Gold), Tamra (Copper), Parad (Mercury) and Gandhak (Sulfur) along with other herbs.
Further, the municipality of Castro Verde is crossed by the Iberian Pyrite Belt, composed of a massive volcanogenic sulfide deposit (VMS) associated with the polymetallic flanks of volcanic cones in the form of pyrite, chalcopyrite, sphalerite, galena and cassiterite, that begins in Aljustrel, spreads through the lower Alentejo and extends into southern Spain.