General Molybdenite Information
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Chemical Formula: |
MoS2 |
Composition: |
Molecular Weight = 160.07 gm |
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Molybdenum 59.94 % Mo |
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Sulfur 40.06 % S |
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______ |
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100.00 % |
Empirical Formula: |
MoS2 |
Environment: |
High temperature hydrothermal veins. Important in disseminated deposits of the porphyry type. |
IMA Status: |
Valid Species (Pre-IMA) 1807 |
Locality: |
Common world wide occurrences. Link to MinDat.org Location Data. |
Name Origin: |
Greek, molybdos = "lead." |
Synonym: |
Castaingite-(Cu) |
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Molybdic ochre |
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Molybdenite Image |
Images:
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Molybdenite Crystallography
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Axial Ratios: |
a:c = 1:3.8924 |
Cell Dimensions: |
a = 3.16, c = 12.3, Z = 2; V = 106.37 Den(Calc)= 5.00 |
Crystal System: |
Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 63/mmc |
X Ray Diffraction: |
By Intensity(I/Io): 6.15(1), 2.277(0.45), 1.83(0.25), |
Forms:
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Crystal Structure:
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Schonfeld B , Huang J J , Moss S C , Acta Crystallographica, Section B , 39 (1983) p.404-407, Anisotropic mean-square displacements (MSD) in single crystals, of 2H- and 3R-MoS2, Note: 2H polytype, this is the most common in nature, Locality: synthetic
View Additional jPOWD Structure files for Molybdenite
[1]
[2]
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Physical Properties of Molybdenite
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Cleavage: |
[0001] Perfect |
Color: |
Black, Lead gray, Gray. |
Density: |
5.5 |
Diaphaniety: |
Opaque |
Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). |
Habit: |
Disseminated - Occurs in small, distinct particles dispersed in matrix. |
Habit: |
Foliated - Two dimensional platy forms. |
Habit: |
Massive - Uniformly indistinguishable crystals forming large masses. |
Hardness: |
1 - Talc |
Luminescence: |
None. |
Luster: |
Metallic |
Magnetism: |
Nonmagnetic |
Streak: |
greenish gray |
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Optical Properties of Molybdenite
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RL Anisotrophism: |
Very strong. |
RL Color: |
Gray, very pale yellow to deep reddish brown in transmitted light. |
RL Pleochroism: |
Very strong. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Molybdenite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
21.00 |
55.00 |

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| 420 nm |
22.20 |
54.80 |

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| 440 nm |
23.40 |
54.60 |

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| 460 nm |
24.10 |
53.80 |

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| 480 nm |
23.80 |
52.30 |

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| 500 nm |
22.70 |
49.70 |

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| 520 nm |
21.90 |
47.10 |

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| 540 nm |
21.30 |
45.50 |

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| 560 nm |
20.90 |
44.40 |

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| 580 nm |
20.60 |
44.00 |

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| 600 nm |
20.40 |
44.60 |

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| 620 nm |
20.20 |
45.30 |

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| 640 nm |
20.00 |
45.70 |

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| 660 nm |
20.00 |
45.60 |

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| 680 nm |
19.90 |
45.40 |

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| 700 nm |
19.70 |
44.20 |

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Calculated Relative Intensity Colors of Molybdenite in Air
Relative Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
430% |
| R1 |
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| R2 |
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Calculated Properties of Molybdenite
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Electron Density: |
relectron=4.62 gm/cc note: rMolybdenite =5.00 gm/cc. |
Fermion Index |
Fermion Index = 0.15566 Boson Index = 0.84434 |
Photoelectric: |
PEMolybdenite = 101.34 barns/electron U=PEMolybdenite x relectron= 468.49 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Molybdenite is Not Radioactive |
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Molybdenite Classification
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Dana Class: |
2.12.10.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.12)where Am Bn Xp, with (m+n):p=1:2 |
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(2.12.10)Dana Group |
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2.12.10.1 Molybdenite MoS2 P 63/mmc 6/m 2/m 2/m |
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2.12.10.2 Drysdallite Mo(Se,S)2 P 63/mmc 6/m 2/m 2/m |
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2.12.10.3 Tungstenite WS2 P 63/mmc 6/m 2/m 2/m |
Strunz Class: |
II/D.25-10 II - Sulfides and sulphosalts |
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II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold |
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II/D.25 - Molybdenite series |
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II/D.25-05 IMA1999-004a! ReS2 P1 1 |
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II/D.25-10 Molybdenite MoS2 P 63/mmc 6/m 2/m 2/m |
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II/D.25-20 Jordisite MoS2 None |
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II/D.25-30 Drysdallite Mo(Se,S)2 P 63/mmc 6/m 2/m 2/m |
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II/D.25-40 Tungstenite WS2 P 63/mmc 6/m 2/m 2/m |
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Other Molybdenite Information
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References: |
NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Molybdenite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Applied Mineralogy
6 -Athena
7 - Crocoite.com Mineral Locations
8 - Franklin Minerals(Palache)
9 - Glendale Community College
10 -Google Images
11 -Google Scholar
12 -Handbook of Mineralogy (UofA)
13 -MinDAT
14 -MinMax(Deutsch)
15 -MinMax(English)
16 -Mineralienatlas (Deutsch)
17 - Minerals of Wisconsin
18 -QUT Mineral Atlas
19 - Scandinavian mineral gallery
20 - WWW-MINCRYST
21 - YupRocks
22 -theimage
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Print or Cut-and-Paste your Molybdenite Specimen Label here :
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Molybdenite
MoS2
Dana No: 2.12.10.1 Strunz No: II/D.25-10
Locality:
Notes:
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