|  |  | 
	 Greigite Mineral Data  |  |  | 
   
| General Greigite  Information  | 
|  Chemical  Formula: | Fe++Fe+++2S4 | 
|  Composition: | Molecular Weight = 295.81 gm | 
|  | Iron    56.64 %  Fe | 
|  | Sulfur  43.36 %  S | 
|  | ______ | 
|  | 100.00 % | 
|  Empirical Formula: | Fe2+Fe3+2S4 | 
|  Environment: | In part, a biomineral | 
|  IMA Status: | Approved IMA 1964 | 
|  Locality: | Kramer - Four Corners area (Drill cores), San Bernardino Co. California. Link to MinDat.org Location Data. | 
|  Name Origin: | For Dr. Joseph Wilson Grieg (1895-1977). | 
|  Name Pronunciation: | Greigite   | 
|  Synonym: | ICSD 42535 | 
|  | Melnikovite | 
|  | PDF 16-713 | 
|  |