As4S4Monoclinic
Cinnabar
As4S4
SulfidesChemical FormulaAs4S4
Crystal SystemMonoclinic
Mohs Hardness1.5
Specific Gravity3.56
ColorRed to orange red
LusterResinous to greasy
StreakOrange red
CleavageOne direction
FractureConchoidal
Occurrence
Found in hydrothermal veins. Arsenic mineral. Toxic. Also called ruby sulfur.