Historical information
Cinnabar is naturally red, but can undergo photo-oxidation to form colloidal metallic mercury at the crystal surface. This mercury may produce a silver colouration
Significance
A common red ore that is often found in locations where there has been volcanic activity and has been historically used as a red pigment as a cosmetic or for colouring stone. It is commonly used today as a method of creating mercury.
Physical description
Red and brownish red stone with some whitish silver material at the surface
Inscriptions & markings
CINNIBAR / (Mercury sulphide) / Locality: Spain.