Cinnabar
Cinnabar, or cinnabarite, also known as mercurblende is the bright scarlet to brick-red form of mercury(II) sulfide. It is the most common source ore for refining elemental mercury and is the historic source for the brilliant red or scarlet... Wikipedia
Categories: Mineral
Cleavage: Prismatic, perfect
Color: Cochineal-red, towards brownish red and lead-gray
Crystal system: Trigonal
Fracture: Uneven to subconchoidal
Luster: Adamantine to dull
Mohs scale hardness: 2.0–2.5