Mineralogy Database

Orcelite Mineral Data

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General Orcelite Information

Help on Chemical  Formula: Chemical Formula: Ni5-xAs2 (x=0.23)
Help on Composition: Composition: Molecular Weight = 429.79 gm
   Nickel   65.14 %  Ni
   Arsenic  34.86 %  As
           100.00 % 
Help on Empirical Formula: Empirical Formula: Ni4.77As2
Help on Environment: Environment: Inclusions in pentlandite in ultramafic rocks.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Tiebaghi massif, New Caledonia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jean Orcel (1896-1978), French mineralogist.
Help on Name Pronunciation: Name Pronunciation: Orcelite Say ORCELITE
Help on Synonym: Synonym: ICSD 15053
  PDF 35-493

Orcelite Image

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Comments: Bronze micro spherical orcelite coated with greenish zaratite.
Location: Tiebaghi Massif, New Caledonia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orcelite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.84925
Help on Cell Dimensions: Cell Dimensions: a = 6.7, c = 12.39, Z = 6; V = 481.67 Den(Calc)= 8.89
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.918(1), 1.977(1), 2.11(0.4),

Physical Properties of Orcelite

Help on Color: Color: Yellow white, Pink bronze.
Help on Density: Density: 7.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Metallic

Optical Properties of Orcelite

Help on RL Anisotrophism: RL Anisotrophism: Noticeable.
Help on RL Color: RL Color: Orange white.
Help on RL Pleochroism: RL Pleochroism: Low, weaker than nickeline.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Orcelite in Air
λ R  ∑ R(λ) 
 400 nm   42.30   
 420 nm   42.90 
 440 nm   43.60 
 460 nm   44.50 
 480 nm   45.50 
 500 nm   46.70 
 520 nm   47.80 
 540 nm   49.10 
 560 nm   50.50 
 580 nm   51.80 
 600 nm   53.30 
 620 nm   54.70 
 640 nm   56.00 
 660 nm   57.20 
 680 nm   58.20 
 700 nm   59.00 
Calculated Relative Intensity Colors of Orcelite in Air
   0%   30%   60%   90% 100% 120% 150% 180% 200%

Calculated Properties of Orcelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=8.26 gm/cc
note: Specific Gravity of Orcelite =8.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0073603773
Boson Index = 0.9926396227
Help on Photoelectric: Photoelectric: PEOrcelite = 51.34 barns/electron
U=PEOrcelite x rElectron Density= 423.80 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orcelite is Not Radioactive

Orcelite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.03)where Am Bn Xp, with (m+n):p=5:2
  (02.03.02)Dana Group Orcelite Ni5-xAs2(x=0.23) P 63cm 6mm
Help on  Strunz Class: Strunz Class: 02.AB.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.A - Simple Sulfides, Selenides, etc
  02.AB -Ni-metalloid alloys
02.AB.10 Orcelite Ni5-xAs2(x=0.23) P 63cm 6mm

Other Orcelite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Orcelite :
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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Print or Cut-and-Paste your Orcelite Specimen Label here :


Ni5-xAs2 (x=0.23)
Dana No: Strunz No: 02.AB.10





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