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Mackinawite Mineral Data
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General Mackinawite Information
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 Chemical Formula: |
(Fe,Ni)S0.9 |
| Composition: |
Molecular Weight = 85.42 gm |
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Iron 49.04 % Fe |
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Nickel 17.18 % Ni |
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Sulfur 33.79 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Fe2+0.75Ni0.25S0.9 |
| Environment: |
Serpentinization of ultrabasic rocks. |
| IMA Status: |
Approved IMA 1962 |
| Locality: |
Mackinaw mine, Snohomish County, Washington, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Mackinawite + Pronunciation  |
| Synonym: |
ICSD 81087 |
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PDF 24-73 |
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Mackinawite Image |
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Images:
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Mackinawite Crystallography
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| Axial Ratios: |
a:c = 1:1.36887 |
| Cell Dimensions: |
a = 3.676, c = 5.032, Z = 2; V = 68.00 Den(Calc)= 4.17 |
| Crystal System: |
Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm |
| X Ray Diffraction: |
By Intensity(I/Io): 5.03(1), 2.31(0.8), 2.97(0.8), |
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Physical Properties of Mackinawite
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| Cleavage: |
{001} Perfect |
| Color: |
Bronze, White gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
| Streak: |
black |
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Optical Properties of Mackinawite
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| RL Anisotrophism: |
Extreme. |
| RL Pleochroism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Mackinawite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
21.00 |
35.50 |
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| 420 nm |
21.00 |
37.20 |
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| 440 nm |
21.00 |
38.90 |
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| 460 nm |
21.00 |
40.40 |
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| 480 nm |
21.10 |
41.80 |
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| 500 nm |
21.20 |
43.10 |
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| 520 nm |
21.30 |
44.30 |
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| 540 nm |
21.60 |
45.30 |
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| 560 nm |
21.90 |
46.10 |
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| 580 nm |
22.20 |
46.90 |
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| 600 nm |
22.60 |
47.40 |
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| 620 nm |
22.90 |
47.80 |
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| 640 nm |
23.30 |
48.20 |
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| 660 nm |
23.80 |
48.50 |
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| 680 nm |
24.30 |
48.80 |
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| 700 nm |
24.90 |
49.10 |
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Calculated Relative Intensity Colors of Mackinawite in Air
Relative
Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
420% |
| R1 |
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| R2 |
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Calculated Properties of Mackinawite
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| Electron Density: |
Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Mackinawite =4.17 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEMackinawite = 23.63 barns/electron
U=PEMackinawite x rElectron Density= 94.38 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mackinawite is Not Radioactive |
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Mackinawite Classification
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| Dana Class: |
02.07.02.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.07)where Am Bn Xp, with (m+n):p=9:8 |
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(02.07.02)Dana Group |
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02.07.02.01 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/m 2/m 2/m |
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02.07.02.02 Sugakiite! Cu(Fe,Ni)8S8 P 41/mnm 4/m 2/m 2/m |
| Strunz Class: |
02.CC.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.C - Metal Sulfides, M:S = 1:1 (and similar) |
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02.CC -With Ni, Fe, Co, PGE, etc. |
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02.CC.25 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/m 2/m 2/m |
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Other Mackinawite Information
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| References: |
PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Mackinawite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Print or Cut-and-Paste your Mackinawite Specimen Label here :
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Mackinawite
(Fe,Ni)S0.9
Dana No: 02.07.02.01 Strunz No: 02.CC.25
Locality:
Notes:
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