Platarsite Mineral Data

Platarsite Mineral Data +

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General Platarsite Information

Chemical Formula:

(Pt,Rh,Ru)AsS

Composition:

Molecular Weight = 265.01 gm

Arsenic 28.27 % As

Ruthenium 3.81 % Ru

Platinum 44.17 % Pt

Rhodium 11.65 % Rh

Sulfur 12.10 % S

______

100.00 %

Empirical Formula:

Pt_0.6Rh_0.3Ru_0.1AsS

Environment:

In replacement pegmatite deposits.

IMA Status:

Approved IMA 1977

Locality:

Onverwacht No. 330 mine, Lydenberg district, Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for the composition, PLATinum and ARSenic.

Synonym:

ICSD 38427

PDF 42-566

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Platarsite Crystallography

Cell Dimensions:

a = 5.79, Z = 4; V = 194.10 Den(Calc)= 9.07

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

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

By Intensity(I/I_o): 1.746(1), 2.896(0.9), 3.345(0.8),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Szymanski J T , The Canadian Mineralogist , 17 (1979) p.117-123, The crystal structure of platarsite, Pt(As,S)2, and a comparison with, sperrylite, PtAs2

Physical Properties of Platarsite

Color:

Gray.

Density:

Diaphaniety:

Opaque

Habit:

Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.

Hardness:

7.5 - Garnet

Luster:

Metallic

Optical Properties of Platarsite

RL Color:

Gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Platarsite in Air**
λ	R	∑ R(λ)
420 nm	47.70
440 nm	47.40
460 nm	47.30
480 nm	47.30
500 nm	47.10
520 nm	47.50
540 nm	48.00
560 nm	48.20
580 nm	48.70
600 nm	49.00
620 nm	48.90
640 nm	48.90
660 nm	49.50
680 nm	49.80
700 nm	49.60

**Calculated Relative Intensity Colors of Platarsite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R

Calculated Properties of Platarsite

Electron Density:

r_electron=7.78 gm/cc
note: r_Platarsite=9.07 gm/cc.

Fermion Index

Fermion Index = 0.16155
Boson Index = 0.83845

Photoelectric:

PE_Platarsite= 723.30 barns/electron
U=PE_Platarsite x r_electron=5,629.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Platarsite is Not Radioactive

Platarsite Classification

Dana Class:

2.12.3.6 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.3)Cobaltite Group (Cubic or pseudocubic crystals)

2.12.3.1 Cobaltite CoAsS P ca2₁ mm2

2.12.3.2 Gersdorffite NiAsS P 2₁3 2 3

2.12.3.3 Ullmannite NiSbS P 2₁3 2 3

2.12.3.4 Willyamite (Co,Ni)SbS P 2₁3 2 3

2.12.3.5 Tolovkite IrSbS P 2₁3 2 3

2.12.3.6 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

2.12.3.7 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

2.12.3.8 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

2.12.3.9 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

2.12.3.10 Padmaite PdBiSe P 2₁3 2 3

2.12.3.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

2.12.3.12 Maslovite PtBiTe P 2₁3 2 3

2.12.3.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

2.12.3.14 Changchengite! IrBiS P 2₁3 2 3

2.12.3.15 Milotaite! PdSbSe P 2₁/3 2 3

2.12.3.16 IMA2004-047! PdAsSe Pa3 4/m 2/m 2/m

Strunz Class:

II/D.18-70 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.18 - Cobaltite group, Cobaltite - Ullmannite - Tolovkite series

II/D.18-10 Cobaltite CoAsS P ca2₁ mm2

II/D.18-20 Gersdorffite NiAsS P 2₁3 2 3

II/D.18-25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

II/D.18-30 Willyamite (Co,Ni)SbS P 2₁3 2 3

II/D.18-40 Ullmannite NiSbS P 2₁3 2 3

II/D.18-50 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

II/D.18-60 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

II/D.18-70 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

II/D.18-80 Tolovkite IrSbS P 2₁3 2 3

Other Platarsite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Platarsite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Platarsite

(Pt,Rh,Ru)AsS
Dana No: 2.12.3.6 Strunz No: II/D.18-70
Locality:

Notes: