This document discusses the mineral vaikranta (tourmaline). It provides details on its chemical formula, sources, color variations, purification process involving swedana and kulattha kashaya, and marana process using gandhaka and nimbu. Vaikranta bhasma has therapeutic uses for diseases like pandu, udara, and prameha. Its uses are described in classical texts like the Ashtanga Hridaya. Precautions are mentioned for use of impure vaikranta which can cause diseases. Common formulations containing vaikranta are also listed.