Bhasma :  in Ayurveda has been defined as a substance obtained by calcination.

Use of both bhasma (Residue after incineration – calcined preparation) as well as in pishti (powdered gem or metal) form along with appropriate herbs for treatment of critical ailments is a medicinal preparation in Ayurveda and to some extentUnani (both Indian branches of medical science using natural curative methods. The procedures for preparing these medicines are time-consuming and complicated.

Bhasma is a calcined preparation in which the gem or metal is converted into ash. Gems or metals are purified to remove impurities and treated by triturating and macerating in herbal extracts. The dough so obtained is calcinated to obtain the ashes

Types of Bhasma