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Hypercinnabar

Type Locality
Mount Diablo Mine (Mt. Diablo Mine; Diablo Mine; Ryne Mine), Mount Diablo (Mt Diablo), Mount Diablo State Park, Clayton, Diablo Range, Contra Costa Co., California, USA
Mineral Data
HgS
Strunz: 
2.CD.15b
Physical Properties
Hardness: 
3.0