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Osmium Mineral Data
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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. |
| Name Pronunciation: |
Osmium  |
| 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 |
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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 Dipyramidal H-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), |
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Physical Properties of Osmium
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| Cleavage: |
{0001} Perfect |
| Color: |
Steel gray. |
| Density: |
19 - 21, Average = 20 |
| Diaphaneity: |
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: |
Bulk Density (Electron Density)=18.4 gm/cc
note: Specific Gravity of Osmium =23.0 gm/cc.
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| Fermion Index: |
Fermion Index = 0.13
Boson Index = 0.87 |
| Photoelectric: |
PEOsmium =1,493.21 barns/electron
U=PEOsmium x rElectron Density=27475.43 barns/cc.
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| 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: |
01.02.02.01 (01)Native Elements |
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(01.02)with platinum group metals and alloys |
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(01.02.02)Osmium group (Space Group P63/mmc) |
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01.02.02.01 Osmium (Os,Ir) P 63/mmc 6/m 2/m 2/m |
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01.02.02.02 Ruthenium (Ru,Ir,Os) P 63/mmc 6/m 2/m 2/m |
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01.02.02.03 Rutheniridosmine (Ir,Os,Ru) P 63/mmc 6/m 2/m 2/m |
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01.02.02.04 Hexaferrum! (Fe,Os,Ru,Ir) P 63/mmc 6/m 2/m 2/m |
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01.02.02.05 Hexamolybdenum! (Mo,Ru,Fe,Ir,Os) P 63/mmc 6/m 2/m 2/m |
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01.02.02.06 IMA2008-055! (Ni,Fe,Ir) P 63/mmc 6/m 2/m 2/m |
| Strunz Class: |
01.AF.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides) |
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01.A - Metals and Intermetallic Alloys |
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01.AF -Platinum-group elements |
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01.AF.05 Osmium (Os,Ir) P 63/mmc 6/m 2/m 2/m |
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01.AF.05 Rutheniridosmine (Ir,Os,Ru) P 63/mmc 6/m 2/m 2/m |
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01.AF.05 Ruthenium (Ru,Ir,Os) 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 - 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
15 - WWW-MINCRYST
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Osmium
(Os,Ir)
Dana No: 01.02.02.01 Strunz No: 01.AF.05
Locality:
Notes:
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