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Miassite Mineral Data
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General Miassite Information
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 Chemical Formula: |
Rh17S15 |
| Composition: |
Molecular Weight = 2,230.38 gm |
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Rhodium 78.43 % Rh |
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Sulfur 21.57 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Rh17S15 |
| Environment: |
Inclusions in isoferroplatinum from placer concentrates. The rhodium and sulfur analogue of palladseite. Identical with prassoite. |
| IMA Status: |
Approved IMA 1997 (Dana # Added) |
| Locality: |
Miass river, Ural Mountains, Russia Link to MinDat.org Location Data. |
| Name Origin: |
Named after the locality. |
| Synonym: |
IMA1997-029 |
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Prassoite |
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Miassite Image |
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Images:
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Miassite
Comments: Composite image of dark gray metallic polished grains and pale yellow vanadinite embedded in epoxy. Miassite occurs as a small inclusion in the larger isoferrplatinum grain on the inset BSE image.
Location: Yukhtochka placer, Tributary of Aldan River, Yakutia, Russia.
Scale: See Image.
© Rruff Database |
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Miassite Crystallography
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| Cell Dimensions: |
a = 10.024, Z = 2; V = 1,007.22 Den(Calc)= 7.35 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P m3m |
| X Ray Diffraction: |
By Intensity(I/Io): 1.774(1)(440), 3.02(0.9)(311), 2.24(0.9)(420),1.931(0.8)(333,511), 3.19(0.7)(310), 2.68(0.5)(321), |
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Physical Properties of Miassite
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| Cleavage: |
None |
| Color: |
Gray. |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Inclusions - Generally found as inclusions in other minerals. |
| Hardness: |
5.5-6 - Knife Blade-Orthoclase |
| Luster: |
Metallic |
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Optical Properties of Miassite
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| RL Color: |
Light gray with no internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Miassite in Air
| λ |
R |
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∑ R(λ) |
| 460 nm |
38.30 |
 |
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| 500 nm |
39.00 |
 |
| 540 nm |
39.00 |
 |
| 580 nm |
39.10 |
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| 660 nm |
38.80 |
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Calculated Relative Intensity Colors of Miassite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
230% |
| R |
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Calculated Properties of Miassite
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| Electron Density: |
Bulk Density (Electron Density)=6.62 gm/cc
note: Specific Gravity of Miassite =7.35 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0016174012
Boson Index = 0.9983825988 |
| Photoelectric: |
PEMiassite = 171.51 barns/electron
U=PEMiassite x rElectron Density=1,136.02 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Miassite is Not Radioactive |
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Miassite Classification
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| Dana Class: |
02.16.19.02 (02)Sulfides - Including Selenides and Tellurides |
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(02.16)with miscellaneous formulae |
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(02.16.19)Palladseite Group |
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02.16.19.01 Palladseite Pd17Se15 P m3m 4/m 3 2/m |
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02.16.19.02 Miassite! Rh17S15 P m3m 4/m 3 2/m |
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02.16.19.02a Prassoite! Rh17S15(?) P m3m 4/m 3 2/m |
| Strunz Class: |
02.BC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1) |
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02.BC -With Rh, Pd, Pt, etc. |
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02.BC.05 Miassite! Rh17S15 P m3m 4/m 3 2/m |
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02.BC.05 Palladseite Pd17Se15 P m3m 4/m 3 2/m |
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Other Miassite Information
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| References: |
NAME( AmMin, Vol 87, p 1511) PHYS. PROP.(AmMin, Vol 87, p 1511) OPTIC PROP.(AmMin, Vol 87, p 1511) |
| See Also: |
Links to other databases for Miassite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Miassite
Rh17S15
Dana No: 02.16.19.02 Strunz No: 02.BC.05
Locality:
Notes:
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