Mindat Short Description
May be confused with valleriite (which it was initially believed to be in the type location).
Mackinawite may form as a metastable product of sulfidation of goethite in the CH4 atmosphere but only when CO2 is added, as shown by an experiment of Wang...
Geoscience Ontology Status Notes
Evans H T, Milton C, Chao E C T, Adler I, Mead C, Ingram B, Berner R A (1964) Valleriite and the new iron sulfide, mackinawite, U.S. Geological Survey Professional Paper 475-D, 64-69
IMA Formula (from Mindat)
(Fe,Ni)1+xS (x = 0-0.07)
RRUFF Formula (from Geoscience Ontology)
(Fe,Ni)1-1.07S