Mineral Information and Data:

Mackinawite
(Fe,Ni)1+xS(x=0-0.07) [CNMNC approved formula]

Named for the locality : Mackinaw mine, Snohomish County, Washington, USA.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
02.07.02.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.07) where Am Bn Xp, with (m+n):p=9:8
  (02.07.02)
  
Nickel-Strunz
(10th edition) :
02.CC.25
  (02) Sulfides
  (02.C) Metal Sulfides, M:S = 1:1 (and similar)
  (02.CC) With Zn, Fe, Cu, Ag, etc.
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  
Other Properties: BioMineral.

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