Miassite Mineral Data

Miassite Mineral Data

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General Miassite Information

Chemical Formula:

Rh17S15

Composition:

Molecular Weight = 2,230.38 gm

Rhodium 78.43 % Rh

Sulfur 21.57 % S

______

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

Prassoite

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Miassite Crystallography

Cell Dimensions:

a = 10.024, Z = 2; V = 1,007.22 Den(Calc)= 7.35

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: P m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

None

Color:

Gray.

Diaphaniety:

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

Optical Properties of Miassite

RL Color:

Light gray with no internal reflections.

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**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	230%
R

Calculated Properties of Miassite

Electron Density:

r_electron=6.62 gm/cc
note: r_Miassite=7.35 gm/cc.

Fermion Index

Fermion Index = 0.00161
Boson Index = 0.99839

Photoelectric:

PE_Miassite= 171.51 barns/electron
U=PE_Miassite x r_electron=1,136.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Miassite is Not Radioactive

Miassite Classification

Dana Class:

2.16.19.2 (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.19)Dana Group

2.16.19.1 Palladseite Pd17Se15 P m3m 4/m 3 2/m

2.16.19.2 Miassite ! Rh17S15 P m3m 4/m 3 2/m

2.16.19.2a Prassoite! Rh17S15(?) P m3m 4/m 3 2/m

Strunz Class:

II/B.16-80 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides with predominant Nickel, Cobalt, Rhodium and Palladium

II/B.16 - Pentlandite group

II/B.16-10 Pentlandite (Fe,Ni)9S8 F m3m 4/m 3 2/m

II/B.16-20 Cobaltpentlandite Co9S8 F m3m 4/m 3 2/m

II/B.16-30 Argentopentlandite Ag(Fe,Ni)8S8 F m3m 4/m 3 2/m

II/B.16-40 Geffroyite (Ag,Cu,Fe)9(Se,S)8 F m3m 4/m 3 2/m

II/B.16-50 Manganese-shadlunite (Mn,Pb)(Cu,Fe)8S8 F m3m 4/m 3 2/m

II/B.16-60 Shadlunite (Pb,Cd)(Fe,Cu)8S8 F m3m 4/m 3 2/m

II/B.16-70 Palladseite Pd17Se15 P m3m 4/m 3 2/m

II/B.16-80 Miassite Rh17S15 P m3m 4/m 3 2/m

II/B.16-80* Prassoite! Rh17S15(?) P m3m 4/m 3 2/m

Other Miassite Information

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Miassite Specimen Label here :

Miassite

Rh17S15
Dana No: 2.16.19.2 Strunz No: II/B.16-80
Locality:

Notes: