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Atheneite Mineral Data
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General Atheneite Information
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 Chemical Formula: |
(Pd,Hg)3As |
| Composition: |
Molecular Weight = 464.81 gm |
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Mercury 32.37 % Hg |
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Arsenic 16.12 % As |
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Palladium 51.51 % Pd |
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______ |
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100.00 % |
| Empirical Formula: |
Pd2.25Hg0.75As |
| Environment: |
In concentrates from gold washings. |
| IMA Status: |
Approved IMA 1973 |
| Locality: |
From Itabira, Minas Gerais, Brazil. From the area around Zlatoust, Ural Mountains, USSR. Link to MinDat.org Location Data. |
| Name Origin: |
After the Greek goddess "Pallas Athene," in allusion to its palladium content. |
| Name Pronunciation: |
Atheneite + Pronunciation  |
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Atheneite Image |
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Images:
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Atheneite
Comments: BSE image of Hg-bearing palladian gold (Au-Pd-Hg), Pd-poor gold and associated PGM in a Mn-Ba-O matrix (possibly romanechite, dark grey). Note that the crystals of atheneite [(Pd,Hg)3As] are on the surface of the Au-Pd-Hg alloy.
Location: Drill-core, recovered in 1982 from the near-surface lateritic portion of the Serra Pelada garimpo (1980-1984) bonanza, Carajas mineral province, Northern Brazil. (CanMin, v40:1451).
Scale: See Image.
© Canadian Mineralogist |
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Atheneite Crystallography
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| Axial Ratios: |
a:c = 1:0.51235 |
| Cell Dimensions: |
a = 6.798, c = 3.483, Z = 2; V = 139.39 Den(Calc)= 11.07 |
| Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm |
| X Ray Diffraction: |
By Intensity(I/Io): 2.423(1), 2.246(0.9), 1.371(0.8), |
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Physical Properties of Atheneite
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| Color: |
Gray white. |
| Density: |
10.2 |
| Diaphaneity: |
Opaque |
| Hardness: |
5 - Apatite |
| Luster: |
Metallic |
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Optical Properties of Atheneite
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| RL Anisotrophism: |
Distinct. |
| RL Color: |
White with bluish tint. |
| RL Pleochroism: |
Very weak, in pale yellow-white to bluish gray-white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Atheneite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
46.10 |
48.30 |
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| 420 nm |
47.40 |
49.80 |
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| 440 nm |
48.50 |
50.90 |
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| 460 nm |
49.70 |
52.40 |
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| 480 nm |
50.80 |
53.60 |
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| 500 nm |
51.90 |
54.80 |
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| 520 nm |
53.00 |
55.80 |
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| 540 nm |
54.00 |
56.70 |
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| 560 nm |
54.80 |
57.30 |
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| 580 nm |
55.70 |
57.80 |
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| 600 nm |
56.40 |
58.30 |
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| 620 nm |
57.00 |
58.50 |
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| 640 nm |
57.40 |
58.60 |
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| 660 nm |
57.60 |
58.70 |
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| 680 nm |
57.90 |
59.00 |
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| 700 nm |
58.20 |
59.10 |
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Calculated Relative Intensity Colors of Atheneite in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
| R1 |
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| R2 |
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Calculated Properties of Atheneite
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| Electron Density: |
Bulk Density (Electron Density)=9.36 gm/cc
note: Specific Gravity of Atheneite =11.1 gm/cc.
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| Fermion Index: |
Fermion Index = 0.21
Boson Index = 0.79 |
| Photoelectric: |
PEAtheneite = 681.59 barns/electron
U=PEAtheneite x rElectron Density=6,379.56 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Atheneite is Not Radioactive |
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Atheneite Classification
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| Dana Class: |
02.02.04.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.02)where Am Bn Xp, with (m+n):p=3:1 |
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(02.02.04)Dana Group |
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02.02.04.01 Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m |
| Strunz Class: |
02.AC.05a 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.AC -Alloys of metalloids with PGE |
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02.AC.05a Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m |
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02.AC.05a Vincentite (Pd,Pt)3(As,Sb,Te) Unk Mono |
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Other Atheneite Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Atheneite :
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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Atheneite
(Pd,Hg)3As
Dana No: 02.02.04.01 Strunz No: 02.AC.05a
Locality:
Notes:
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