Cinnabar with the deadly toxin. Cinnabar Cinnabar () and cinnabarite (), likely deriving from the ("kinnabari"), refer to the common bright scarlet to brick-red form of mercury(II) sulfide (HgS) that is the most common source ore for refining elemental mercury, and is the historic source for the brilliant red or scarlet pigment termed vermilion and associated red mercury pigments. Cinnabar generally occurs as a vein-filling mineral associated with recent volcanic activity and alkaline hot springs. The mineral resembles quartz in symmetry and in its exhibiting birefringence; cinnabar has a mean refractive index of approximately 3.2, a hardness between 2.0 and 2.5,
Cinnabar Theater of Figaro" (2014), and others. Notable among the many dramatic works produced at Cinnabar was a 2004 production of Tony Kushner's "The Illusion" (1988) adapted from "L’Illusion Comique" by 17th-century French playwright Pierre Corneille. The Cinnabar production featured actor Jeffrey Weissman. In 2013, Broadway veteran and film/television actor Charles Siebert played the role of Gregory Solomon in the Cinnabar production of Arthur Miller's "The Price." Cinnabar Theater The Cinnabar Theater, located in Petaluma, California, is a professional non-profit theater producing opera and musical theatre, drama and a chamber music series in a 120-seat venue, under the auspices of the Cinnabar