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Petewilliamsite Mineral Data

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General Petewilliamsite Information

Help on Chemical  Formula: Chemical Formula: (Ni,Co,Cu)30(As2O7)15
Help on Composition: Composition: Molecular Weight = 5,730.36 gm
   Calcium   0.12 %  Ca    0.17 % CaO
   Iron      0.03 %  Fe    0.04 % FeO
   Cobalt   14.21 %  Co   18.07 % CoO
   Copper    2.67 %  Cu    3.35 % CuO
   Nickel   15.01 %  Ni   19.11 % NiO
   Arsenic  38.64 %  As   59.26 % As2O5
   Oxygen   29.32 %  O
           ______        ______ 
           100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ni14.66Co13.82Cu2.41Ca0.17Fe2+0.0315(As1.97)15(O7)
Help on Environment: Environment: In a fine-grained quartz specimen. It is the only known natural pyroarsenate.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Johanngeorgenstadt, Saxony, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Peter (Pete) Allan Williams (b. 1950), Professor, Minerals and Materials Group, School of Science, Food and Horticulture, University of Western Sydney, Penrith South DC, N ew South Wales, Australia.
Help on Synonym: Synonym: IMA2002-059
 

Petewilliamsite Image

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  Petewilliamsite

Comments: SEM image of a portion of a petewilliamsite aggregate. Note the rounded nature of the crystal faces. (Min. Mag. 68:235).
Location: Johanngeorgenstadt, Saxony, Germany. Scale: See Image.
© Mineralogical Magazine

Petewilliamsite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.9208:1:1.6731
Help on Cell Dimensions: Cell Dimensions: a = 33.256, b = 8.4818, c = 14.191, Z = 1; beta = 104.145° V = 3,881.50 Den(Calc)= 2.45
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: C 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.118(1)(513,023), 3.005(0.6)(10.0.3), 1.637(0.5)(536),2.567(0.5)(10.2.0), 1.507(0.3)(553,15.3.3,204.235(0.3)(020),
 

Physical Properties of Petewilliamsite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark violet red, Dark brownish red.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 1.5-2.5 - Hardness very near Gypsum
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: pale reddish brown
 

Optical Properties of Petewilliamsite

Help on Optical Data: Optical Data: NCalc= 1.41 - from Gladstone-Dale relationship (KC = 0.1681) where Ncalc=Dcalc*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Not obvious.
Help on RL Bireflectance: RL Bireflectance: None.
Help on RL Color: RL Color: Dark gray with orange internal reflections.
Help on RL Pleochroism: RL Pleochroism: None.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Petewilliamsite in Air
λ R  ∑ R(λ) 
 400 nm    9.84   
 420 nm    9.85 
 440 nm    9.71 
 460 nm    9.63 
 470 nm    9.59 
 480 nm    9.55 
 500 nm    9.49 
 520 nm    9.39 
 540 nm    9.33 
 546 nm    9.32 
 560 nm    9.29 
 580 nm    9.33 
 589 nm    9.27 
 600 nm    9.33 
 620 nm    9.29 
 640 nm    9.33 
 650 nm    9.33 
 660 nm    9.32 
 680 nm    9.31 
 700 nm    9.30 
Calculated Relative Intensity Colors of Petewilliamsite in Air
Relative
Intensity
   0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 940%
R                      
 

Calculated Properties of Petewilliamsite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Petewilliamsite =2.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0018451825
Boson Index = 0.9981548175
Help on Photoelectric: Photoelectric: PEPetewilliamsite = 39.26 barns/electron
U=PEPetewilliamsite x rElectron Density= 89.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Petewilliamsite is Not Radioactive
 

Petewilliamsite Classification

Help on  Dana Class: Dana Class: 38.04.13.01 (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.13)Dana Group
 
38.04.13.01 Petewilliamsite! (Ni,Co,Cu)30(As2O7)15 C 2 2
Help on  Strunz Class: Strunz Class: 08.FA.25 08 - PHOSPHATES, ARSENATES, VANADATES
  08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates
  08.FA -Polyphosphates, etc., without OH and H2O; dimers of corner-sharing RO4 tetrahedra.
 
08.FA.25 Petewilliamsite! (Ni,Co,Cu)30(As2O7)15 C 2 2
 

Other Petewilliamsite Information

Help on References: References: NAME( CanMin, 42:1922) PHYS. PROP.(CanMin, 42:1922) OPTIC PROP.(MinMag, 68:235)
Help on See Also: See Also: Links to other databases for Petewilliamsite :
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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Petewilliamsite

(Ni,Co,Cu)30(As2O7)15
Dana No: 38.04.13.01 Strunz No: 08.FA.25
Locality:

 

Notes:

 

 
   
 


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