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Orcelite Mineral Data
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General Orcelite Information
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 Chemical Formula: |
Ni5-xAs2 (x=0.23) |
| Composition: |
Molecular Weight = 429.79 gm |
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Nickel 65.14 % Ni |
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Arsenic 34.86 % As |
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______ |
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100.00 % |
| Empirical Formula: |
Ni4.77As2 |
| Environment: |
Inclusions in pentlandite in ultramafic rocks. |
| IMA Status: |
Approved IMA 1959 |
| Locality: |
Tiebaghi massif, New Caledonia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Jean Orcel (1896-1978), French mineralogist. |
| Name Pronunciation: |
Orcelite  |
| Synonym: |
ICSD 15053 |
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PDF 35-493 |
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Orcelite Image |
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Images:
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Orcelite Crystallography
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| Axial Ratios: |
a:c = 1:1.84925 |
| Cell Dimensions: |
a = 6.7, c = 12.39, Z = 6; V = 481.67 Den(Calc)= 8.89 |
| Crystal System: |
Hexagonal - Dihexagonal Pyramidal H-M Symbol (6mm) Space Group: P 63cm |
| X Ray Diffraction: |
By Intensity(I/Io): 1.918(1), 1.977(1), 2.11(0.4), |
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Physical Properties of Orcelite
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| Color: |
Yellow white, Pink bronze. |
| Density: |
7.5 |
| Diaphaneity: |
Opaque |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Luster: |
Metallic |
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Optical Properties of Orcelite
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| RL Anisotrophism: |
Noticeable. |
| RL Color: |
Orange white. |
| RL Pleochroism: |
Low, weaker than nickeline. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Orcelite in Air
| λ |
R |
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∑ R(λ) |
| 400 nm |
42.30 |
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| 420 nm |
42.90 |
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| 440 nm |
43.60 |
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| 460 nm |
44.50 |
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| 480 nm |
45.50 |
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| 500 nm |
46.70 |
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| 520 nm |
47.80 |
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| 540 nm |
49.10 |
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| 560 nm |
50.50 |
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| 580 nm |
51.80 |
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| 600 nm |
53.30 |
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| 620 nm |
54.70 |
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| 640 nm |
56.00 |
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| 660 nm |
57.20 |
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| 680 nm |
58.20 |
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| 700 nm |
59.00 |
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Calculated Relative Intensity Colors of Orcelite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
200% |
| R |
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Calculated Properties of Orcelite
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| Electron Density: |
Bulk Density (Electron Density)=8.26 gm/cc
note: Specific Gravity of Orcelite =8.89 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0073603773
Boson Index = 0.9926396227 |
| Photoelectric: |
PEOrcelite = 51.34 barns/electron
U=PEOrcelite x rElectron Density= 423.80 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orcelite is Not Radioactive |
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Orcelite Classification
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| Dana Class: |
02.03.02.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.03)where Am Bn Xp, with (m+n):p=5:2 |
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(02.03.02)Dana Group |
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02.03.02.01 Orcelite Ni5-xAs2(x=0.23) P 63cm 6mm |
| Strunz Class: |
02.AB.10 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.A - Simple Sulfides, Selenides, etc |
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02.AB -Ni-metalloid alloys |
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02.AB.10 Orcelite Ni5-xAs2(x=0.23) P 63cm 6mm |
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Other Orcelite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| 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 :
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Orcelite
Ni5-xAs2 (x=0.23)
Dana No: 02.03.02.01 Strunz No: 02.AB.10
Locality:
Notes:
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