General Pentlandite Information
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Chemical Formula: |
(Fe,Ni)9S8 |
Composition: |
Molecular Weight = 771.94 gm |
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Iron 32.56 % Fe |
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Nickel 34.21 % Ni |
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Sulfur 33.23 % S |
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______ |
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100.00 % |
Empirical Formula: |
Fe2+4.5Ni4.5S8 |
Environment: |
Common as the sulfide phase in basic and ultra-basic intrusive igneous rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1856 |
Locality: |
Espedalen, near Lillihammer, Norway. Link to MinDat.org Location Data. |
Name Origin: |
Named after the Irish natural historian, J. B. Pentland (1797-1873). |
Synonym: |
ICSD 61021 |
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PDF Aug-90 |
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Pentlandite Image |
Images:
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Pentlandite
Comments: Ore sample of a mixture of several sulfide minerals: pentlandite, chalcopyrite, and pyrrhotite.
Location: Frood-Stobie Mine, Sudbury District, Ontario, Canada.
Scale: 20x15x7 mm.
© John Betts - Fine Minerals |
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Pentlandite Crystallography
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Cell Dimensions: |
a = 10.04, Z = 4; V = 1,012.05 Den(Calc)= 5.07 |
Crystal System: |
Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m |
X Ray Diffraction: |
By Intensity(I/Io): 1.775(1), 3.03(0.8), 1.931(0.5), |
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
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Pearson A D , Buerger M J , American Mineralogist , 41 (1956) p.804-805, Confirmation of the crystal structure of pentlandite.
View Additional jPOWD Structure files for Pentlandite
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Physical Properties of Pentlandite
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Cleavage: |
None |
Color: |
Bronze, Brown. |
Density: |
4.6 - 5, Average = 4.8 |
Diaphaniety: |
Opaque |
Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Hardness: |
3.5-4 - Copper Penny-Fluorite |
Luminescence: |
None. |
Luster: |
Metallic |
Magnetism: |
Nonmagnetic |
Streak: |
greenish black |
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Optical Properties of Pentlandite
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RL Pleochroism: |
None. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Pentlandite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
30.90 |
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| 420 nm |
34.80 |
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| 440 nm |
38.70 |
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| 460 nm |
41.80 |
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| 480 nm |
44.20 |
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| 500 nm |
46.30 |
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| 520 nm |
47.90 |
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| 540 nm |
49.20 |
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| 560 nm |
50.40 |
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| 580 nm |
51.10 |
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| 600 nm |
52.30 |
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| 620 nm |
53.10 |
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| 640 nm |
53.80 |
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| 660 nm |
54.50 |
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| 680 nm |
55.00 |
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| 700 nm |
55.60 |
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Calculated Relative Intensity Colors of Pentlandite in Air
Relative Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
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Calculated Properties of Pentlandite
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Electron Density: |
relectron=4.87 gm/cc note: rPentlandite =5.07 gm/cc. |
Fermion Index |
Fermion Index = 0.01326 Boson Index = 0.98674 |
Photoelectric: |
PEPentlandite = 25.41 barns/electron U=PEPentlandite x relectron= 123.85 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pentlandite is Not Radioactive |
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Pentlandite Classification
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Dana Class: |
2.7.1.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.7)where Am Bn Xp, with (m+n):p=9:8 |
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(2.7.1)Pentalndite Group (Isometric: Fm3m) |
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2.7.1.1 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m |
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2.7.1.2 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m |
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2.7.1.3 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m |
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2.7.1.4 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m |
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2.7.1.5 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m |
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2.7.1.6 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m |
Strunz Class: |
II/B.16-10 II - Sulfides and sulphosalts |
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II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium |
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II/B.16 - Pentlandite group |
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II/B.16-10 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m |
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II/B.16-20 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m |
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II/B.16-30 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m |
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II/B.16-40 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m |
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II/B.16-50 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m |
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II/B.16-60 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m |
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II/B.16-70 Palladseite Pd17Se15 P m3m 4/m 3 2/m |
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II/B.16-80 Miassite! Rh17S15 P m3m 4/m 3 2/m |
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II/B.16-80* Prassoite! Rh17S15(?) P m3m 4/m 3 2/m |
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Other Pentlandite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Pentlandite :
1 -Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Applied Mineralogy
4 -Athena
5 - Crocoite.com Mineral Locations
6 - EUROmin Project
7 -Google Images
8 -Google Scholar
9 -Handbook of Mineralogy (UofA)
10 -MinDAT
11 -MinMax(Deutsch)
12 -MinMax(English)
13 -Mineralienatlas (Deutsch)
14 - Minerals of Wisconsin
15 -QUT Mineral Atlas
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST
18 -École des Mines de Paris
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Print or Cut-and-Paste your Pentlandite Specimen Label here :
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Pentlandite
(Fe,Ni)9S8
Dana No: 2.7.1.1 Strunz No: II/B.16-10
Locality:
Notes:
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