General Osmium Information
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Chemical Formula: |
(Os,Ir) |
Composition: |
Molecular Weight = 190.71 gm |
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Iridium 25.20 % Ir |
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Osmium 74.80 % Os |
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______ |
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100.00 % |
Empirical Formula: |
Os0.75Ir0.25 |
Environment: |
In magmatic segregation deposits and concentrated in placers derived from ultrabasic rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1804 |
Locality: |
Urals Region, Sverdlovskaya Oblast', Nizhnii Tagi, Russia. Link to MinDat.org Location Data. |
Name Origin: |
Named for the principle element in the composition. |
Synonym: |
ICSD 40323 |
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Iridosmine |
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Nevyanakite |
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PDF 41-601 |
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Rutheniridosmium |
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Siserskite |
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Osmium Image |
Images:
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Osmium Cooperite Vasilite Vysotskite
Comments: BSE image taken with a SEM of the sulfide-dominant microparagenesis filling a gas vacuole. Cooperite crystal surrounded by Pd-Cu-Pt-S phase (vasilite?), vysotskite and osmium laths (white) in chalcopyrite-bornite matrix (dark). (CanMin 38:1258).
Location: Pustaya River placer deposit, situated within the Koryak-Kamchatka platinum-bearing belt of Alaskan-type intrusions in eastern Russia.
Scale: See Image.
© Canadian Mineralogist |
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Osmium Crystallography
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Axial Ratios: |
a:c = 1:1.58953 |
Cell Dimensions: |
a = 2.714, c = 4.314, Z = 2; V = 27.52 Den(Calc)= 23.01 |
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): 1.22(1), 2.13(1), 1.35(0.6), |
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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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Hexagonal closest packed, hcp, structure
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Physical Properties of Osmium
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Cleavage: |
[0001] Perfect |
Color: |
Steel gray. |
Density: |
19 - 21, Average = 20 |
Diaphaniety: |
Opaque |
Fracture: |
Elastic - Fragments which spring back after bending. |
Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
Hardness: |
6-7 - Orthoclase-Quartz |
Luster: |
Metallic |
Streak: |
gray |
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Optical Properties of Osmium
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RL Anisotrophism: |
Weak to moderate. |
RL Color: |
White, bluish gray tint. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Osmium in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
62.60 |
63.60 |

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| 420 nm |
63.20 |
64.20 |

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| 440 nm |
63.80 |
64.80 |

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| 460 nm |
64.30 |
65.30 |

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| 480 nm |
64.60 |
65.60 |

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| 500 nm |
64.80 |
66.00 |

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| 520 nm |
64.60 |
66.20 |

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| 540 nm |
64.30 |
66.20 |

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| 560 nm |
64.00 |
66.00 |

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| 580 nm |
63.50 |
65.70 |

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| 600 nm |
63.10 |
65.40 |

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| 620 nm |
62.80 |
65.40 |

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| 640 nm |
62.60 |
65.40 |

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| 660 nm |
62.40 |
65.50 |

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| 680 nm |
62.20 |
65.60 |

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| 700 nm |
62.00 |
65.80 |

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Calculated Relative Intensity Colors of Osmium in Air
Relative Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
| R1 |
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| R2 |
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Calculated Properties of Osmium
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Electron Density: |
relectron=18.4 gm/cc note: rOsmium =23.0 gm/cc. |
Fermion Index |
Fermion Index = 0.13239 Boson Index = 0.86761 |
Photoelectric: |
PEOsmium =1,493.21 barns/electron U=PEOsmium x relectron=27475.42 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Osmium is Not Radioactive |
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Osmium Classification
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Dana Class: |
1.2.2.1 (1)Native Elements |
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(1.2)with platinum group metals and alloys |
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(1.2.2)Osmium group (Space Group P63/mmc) |
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1.2.2.1 Osmium (Os,Ir) P 63/mmc 6/m 2/m 2/m |
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1.2.2.2 Ruthenium (Ru,Ir,Os) P 63/mmc 6/m 2/m 2/m |
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1.2.2.3 Rutheniridosmine (Ir,Os,Ru) P 63/mmc 6/m 2/m 2/m |
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1.2.2.4 Hexaferrum! (Fe,Os,Ru,Ir) P 63/mmc 6/m 2/m 2/m |
Strunz Class: |
I/A.13-20 I - Elements |
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I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides |
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I/A.13 - Osmium series |
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I/A.13-10 Rhenium* Re P 63/mmc 6/m 2/m 2/m |
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I/A.13-15 Hexaferrum! (Fe,Os,Ru,Ir) P 63/mmc 6/m 2/m 2/m |
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I/A.13-20 Osmium (Os,Ir) P 63/mmc 6/m 2/m 2/m |
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I/A.13-30 Ruthenium (Ru,Ir,Os) P 63/mmc 6/m 2/m 2/m |
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I/A.13-40 Rutheniridosmine (Ir,Os,Ru) P 63/mmc 6/m 2/m 2/m |
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Other Osmium Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Osmium :
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 - WWW-MINCRYST
14 -École des Mines de Paris
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Osmium
(Os,Ir)
Dana No: 1.2.2.1 Strunz No: I/A.13-20
Locality:
Notes:
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