Category Sulfide mineral Strunz classification 2.CB.05a Space group F43m | Formula(repeating unit) HgS | |
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Crystal class Hextetrahedral (43m)H-M symbol: (4 3m) | ||
Metacinnabar is the cubic form of mercury sulfide (HgS). It is the low temperature form and trimorphous with cinnabar (trigonal structure) and the high temperature hypercinnabar (hexagonal structure). 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.
References
Metacinnabar Wikipedia(Text) CC BY-SA