Lithium
Li This alkali metal is named "lithos", from the Greek word λιθoς (transliterated as lithos, meaning "stone"). Lithium Wiki
Filming Concepts
Treatment for Mental Illness
Lithium is used in the treatment of Bipolar disorder as a mood stabilizer.
This drug, is featured in several songs, most famously by Kurt Cobain, Sting, and Evanescence.