Mineralogy Database

Miassite Mineral Data

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General Miassite Information

Help on Chemical  Formula: Chemical Formula: Rh17S15
Help on Composition: Composition: Molecular Weight = 2,230.38 gm
   Rhodium  78.43 %  Rh
   Sulfur   21.57 %  S
           100.00 % 
Help on Empirical Formula: Empirical Formula: Rh17S15
Help on Environment: Environment: Inclusions in isoferroplatinum from placer concentrates. The rhodium and sulfur analogue of palladseite. Identical with prassoite.
Help on IMA Status: IMA Status: Approved IMA 1997 (Dana # Added)
Help on Locality: Locality: Miass river, Ural Mountains, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA1997-029

Miassite Image

Click Here for Larger   Image in a New Browser Window Images:
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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

Miassite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.024, Z = 2; V = 1,007.22 Den(Calc)= 7.35
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: P m3m
Help on X Ray Diffraction: 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),

Physical Properties of Miassite

Help on Cleavage: Cleavage: None
Help on Color: Color: Gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 5.5-6 - Knife Blade-Orthoclase
Help on Luster: Luster: Metallic

Optical Properties of Miassite

Help on RL Color: RL Color: Light gray with no internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Miassite in Air
λ R  ∑ R(λ) 
 460 nm   38.30   
 500 nm   39.00 
 540 nm   39.00 
 580 nm   39.10 
 660 nm   38.80 
Calculated Relative Intensity Colors of Miassite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 210% 230%

Calculated Properties of Miassite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.62 gm/cc
note: Specific Gravity of Miassite =7.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0016174012
Boson Index = 0.9983825988
Help on Photoelectric: Photoelectric: PEMiassite = 171.51 barns/electron
U=PEMiassite x rElectron Density=1,136.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Miassite is Not Radioactive

Miassite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.19)Palladseite Group Palladseite Pd17Se15 P m3m 4/m 3 2/m Miassite! Rh17S15 P m3m 4/m 3 2/m Prassoite! Rh17S15(?) P m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 02.BC.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)
  02.BC -With Rh, Pd, Pt, etc.
02.BC.05 Miassite! Rh17S15 P m3m 4/m 3 2/m
02.BC.05 Palladseite Pd17Se15 P m3m 4/m 3 2/m

Other Miassite Information

Help on References: References: NAME( AmMin, Vol 87, p 1511) PHYS. PROP.(AmMin, Vol 87, p 1511) OPTIC PROP.(AmMin, Vol 87, p 1511)
Help on See Also: 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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Dana No: Strunz No: 02.BC.05





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