Stillwaterite Mineral Data + Say STILLWATERITE


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General Stillwaterite Information

Help on Chemical  Formula: Chemical Formula: Pd8As3
Help on Composition: Composition: Molecular Weight = 1,076.12 gm
   Arsenic    20.89 %  As
   Palladium  79.11 %  Pd
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: Pd8As3
Help on Environment: Environment: SM reef in the Stillwater layered basic intrusion. SM reef is a cumulate concentration of platinum group metals included in pyrrhotite crystals.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Stillwater Complex, Nye County, Montana, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
 

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Stillwaterite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.39356
Help on Cell Dimensions: Cell Dimensions: a = 7.399, c = 10.311, Z = 3; V = 488.85 Den(Calc)= 10.97
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.115(1), 2.355(0.8), 1.351(0.5),
 

Physical Properties of Stillwaterite

Help on Color: Color: Gray.
Help on Density: Density: 10.4
Help on Diaphaniety: Diaphaniety: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Metallic
 

Optical Properties of Stillwaterite

Help on RL Anisotrophism: RL Anisotrophism: Weak in air, dark gray to brownish gray, in oil, distinct in brownish black with a blue to yellowish.
Help on RL Color: RL Color: Light creamy gray.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Stillwaterite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   51.60   52.70 
   
 546 nm   52.50   53.20 
 589 nm   53.10   53.70 
 650 nm   54.40   55.00 
Calculated Relative Intensity Colors of Stillwaterite in Air
Relative
Intensity
   0%   20%   40%   60%   80% 100% 120% 140% 160% 170%
R1                    
R2                    
 

Calculated Properties of Stillwaterite

Help on Electron Density: Electron Density:

relectron=9.52 gm/cc
note: rStillwaterite =11.0 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.17666
Boson Index = 0.82334
Help on Photoelectric: Photoelectric:

PEStillwaterite = 206.24 barns/electron
U=PEStillwaterite x relectron=1,963.67 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stillwaterite is Not Radioactive

 

Stillwaterite Classification

Help on  Dana Class: Dana Class: 2.16.4.1 (2)Sulfides - Including Selenides and Tellurides
  (2.16)with miscellaneous formulae
  (2.16.4)Dana Group
 
2.16.4.1 Stillwaterite Pd8As3 P 3 3
Help on  Strunz Class: Strunz Class: II/A.05-30 II - Sulfides and sulphosalts
  II/A - Alloys and alloylike compounds, with metals of the Platinum series, (Palladium)
  II/A.05 - Atheneite - Genkinite series
 
II/A.05-10 Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m
 
II/A.05-20 Vincentite (Pd,Pt)3(As,Sb,Te) Unk Mono
 
II/A.05-30 Stillwaterite Pd8As3 P 3 3
 
II/A.05-40 Arsenopalladinite Pd8(As,Sb)3 P1 1
 
II/A.05-50 Isomertieite Pd11Sb2As2 F d3m 4/m 3 2/m
 
II/A.05-60 Mertieite-I Pd11(Sb,As)4 Unk Hex
 
II/A.05-70 Mertieite-II Pd8(Sb,As)3 R 3c 3m
 
II/A.05-80 Stibiopalladinite Pd5Sb2 P 63mc 6mm
 
II/A.05-90 Palladoarsenide Pd2As P 2/m 2/m
 
II/A.05-100 Palladobismutharsenide Pd2(As,Bi) Pmcn,P 21cn Ortho
 
II/A.05-102 Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m
 
II/A.05-105 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho
 
II/A.05-110 Majakite PdNiAs Unk Hex
 
II/A.05-112 Menshikovite! Pd3Ni2As3 P 63/m,P 63, or P 6322 Hex
 
II/A.05-115 Polkanovite! Rh12As7 P 63m 6/m
 
II/A.05-120 Genkinite (Pt,Pd)4Sb3 P 41212 4 2 2
 

Other Stillwaterite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Stillwaterite :
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 -École des Mines de Paris

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

Stillwaterite

Pd8As3
Dana No: 2.16.4.1 Strunz No: II/A.05-30
Locality:

 

Notes:

 

 
   
 
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