FTP name the soft, bright red mineral with  chemical formula HgS, the principal commercial source of mercury.
It is the most refractive natural mineral on earth, while a  synthetic version of it is used to make a pigment called vermilion.  A comparatively rare substance, it occurs in veins in sedimentary  rock, and is principally found in Spain, Italy, Mexico, and the  American Southwest. FTP name the soft, bright red mineral with  chemical formula HgS, the principal commercial source of mercury.
It is the most refractive natural mineral on earth, while a  synthetic version of it is used to make a pigment called vermilion.  
{cinnabar}