Mackinawite Mineral Data + Say MACKINAWITE

General Mackinawite Information
Help on Chemical Formula: Chemical Formula: (Fe,Ni)S0.9
Help on Composition: Composition: Molecular Weight = 85.42 gm
   Iron    49.04 %  Fe
   Nickel  17.18 %  Ni
   Sulfur  33.79 %  S
          ______ 
          100.00 % 
Help on Empirical Formula: Empirical Formula: Fe2+0.75Ni0.25S0.9
Help on Environment: Environment: Serpentinization of ultrabasic rocks.
Help on IMA Status: IMA Status: Approved IMA 1962
Help on Locality: Locality: Mackinaw mine, Snohomish County, Washington, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 81087
  PDF 24-73
 

Mackinawite Image

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Mackinawite

Comments: Mackinawite inclusions in sulfide ore (polished specimen).
Location: Mackinaw Mine, Snohomish County, Washington, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mackinawite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.36887
Help on Cell Dimensions: Cell Dimensions: a = 3.676, c = 5.032, Z = 2; V = 68.00 Den(Calc)= 4.17
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.03(1), 2.31(0.8), 2.97(0.8),
 

Physical Properties of Mackinawite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Bronze, White gray.
Help on Diaphaniety: Diaphaniety: Opaque
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: black
 

Optical Properties of Mackinawite

Help on RL Anisotrophism: RL Anisotrophism: Extreme.
Help on RL Pleochroism: RL Pleochroism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Mackinawite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   21.00   35.50 
   
 420 nm   21.00   37.20 
 440 nm   21.00   38.90 
 460 nm   21.00   40.40 
 480 nm   21.10   41.80 
 500 nm   21.20   43.10 
 520 nm   21.30   44.30 
 540 nm   21.60   45.30 
 560 nm   21.90   46.10 
 580 nm   22.20   46.90 
 600 nm   22.60   47.40 
 620 nm   22.90   47.80 
 640 nm   23.30   48.20 
 660 nm   23.80   48.50 
 680 nm   24.30   48.80 
 700 nm   24.90   49.10 
Calculated Relative Intensity Colors of Mackinawite in Air
Relative
Intensity		    0%   50% 100% 150% 200% 250% 300% 350% 400% 420%
R1                    
R2                    
 

Calculated Properties of Mackinawite

Help on Electron Density: Electron Density:

relectron=3.99 gm/cc
note: rMackinawite =4.17 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01487
Boson Index = 0.98513
Help on Photoelectric: Photoelectric:

PEMackinawite = 23.63 barns/electron
U=PEMackinawite x relectron= 94.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mackinawite is Not Radioactive
 

Mackinawite Classification
Help on Dana Class: Dana Class: 2.7.2.1 (2)Sulfides - Including Selenides and Tellurides
  (2.7)where Am Bn Xp, with (m+n):p=9:8
  (2.7.2)Dana Group
 
2.7.2.1 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: II/B.17-10 II - Sulfides and sulphosalts
  II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium and related compounds
  II/B.17 - Mackinawite - Karaelakhite series
 
II/B.17-10 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/m 2/m 2/m
 
II/B.17-20 Godlevskite (Ni,Fe)9S8 C 222 2 2 2
 
II/B.17-30 Kharaelakhite (Pt,Cu,Pb,Fe,Ni)9S8 P mmm 2/m 2/m 2/m
 

Other Mackinawite Information
Help on References: References: PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Mackinawite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - University of Manchester - Mineral Structure 14 -École des Mines de Paris

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Mackinawite

(Fe,Ni)S0.9
Dana No: 2.7.2.1 Strunz No: II/B.17-10
Locality:

 

Notes:

 
 
   
 
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