Mackinawite Mineral Data (original) (raw)

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 Name Pronunciation: Name Pronunciation:

Mackinawite + Pronunciation Say MACKINAWITE

Help on Synonym: Synonym:

ICSD 81087

PDF 24-73

Mackinawite Image

Click Here for Larger Mackinawite Image in a New Browser Window Images:

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),

Click Here for Large Mackinawite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

| | Lennie A R , Redfern S A T , Schofield P F , Vaughan D J , Mineralogical Magazine , 59 (1995) p.677-683, Synthesis and Rietveld crystal structure refinement of mackinawite, tetragonal, FeS, Locality: synthetic | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Mackinawite

Help on Cleavage: Cleavage:

{001} Perfect

Help on Color: Color:

Bronze, White gray.

Help on Diaphaneity: Diaphaneity:

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 R 2 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

RelativeIntensity 0% 50% 100% 150% 200% 250% 300% 350% 400% 420%
R1
R2

Calculated Properties of Mackinawite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Mackinawite =4.17 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PEMackinawite = 23.63 barns/electron
U=PEMackinawite x rElectron Density= 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:

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)Dana Group

02.07.02.01 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/m 2/m 2/m

02.07.02.02 Sugakiite! Cu(Fe,Ni)8S8 P 41/mnm 4/m 2/m 2/m

Help on  Strunz Class: Strunz Class:

02.CC.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.25 Mackinawite (Fe,Ni)S0.9 P 4/nmm 4/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 - 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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Ask about Mackinawite here :
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Print or Cut-and-Paste your Mackinawite Specimen Label here :

Mackinawite

(Fe,Ni)S0.9
Dana No: 02.07.02.01 Strunz No: 02.CC.25
Locality:

Notes: