Mineralogy Database

Stillwaterite Mineral Data

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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: J-M reef in the Stillwater layered basic intrusion. J-M reef is a stratobound 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.
Help on Name Pronunciation: Name Pronunciation: Stillwaterite + Pronunciation Say STILLWATERITE

Stillwaterite Image

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Comments: B&W photomicrograph of a stillwaterite grain (gray) associated with native gold. (CanMin, v13:321).
Location: Heavy mineral centrates from the Banded and Upper zones of Stillwater Complex, Montana, USA. Scale: See Image.
© Canadian Mineralogist

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 - Rhombohedral H-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 Diaphaneity: Diaphaneity: 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
   0%   20%   40%   60%   80% 100% 120% 140% 160% 170%

Calculated Properties of Stillwaterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=9.52 gm/cc
note: Specific Gravity of Stillwaterite =11.0 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.17
Boson Index = 0.83
Help on Photoelectric: Photoelectric: PEStillwaterite = 206.24 barns/electron
U=PEStillwaterite x rElectron Density=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: (02)Sulfides - Including Selenides and Tellurides
  (02.16)with miscellaneous formulae
  (02.16.04)Dana Group Stillwaterite Pd8As3 P 3 3
Help on  Strunz Class: Strunz Class: 02.AC.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.A - Simple Sulfides, Selenides, etc
  02.AC -Alloys of metalloids with PGE
02.AC.10a Stillwaterite Pd8As3 P 3 3

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.AC.10a





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