Metacinnabar
Metacinnabar is the cubic form of mercury sulfide. It is the high temperature form and trimorphous with cinnabar and the higher temperature hypercinnabar. It occurs with cinnabar in mercury deposits and is associated with native mercury, wurtzite, stibnite, marcasite, realgar, calcite, barite,
chalcedony and hydrocarbons.
It was first described in 1870 for an occurrence in the Redington mine, Knoxville, Napa County, California.