General Arsenopalladinite Information
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Chemical Formula: |
Pd8(As,Sb)3 |
Composition: |
Molecular Weight = 1,099.54 gm |
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Antimony 5.54 % Sb |
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Arsenic 17.03 % As |
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Palladium 77.43 % Pd |
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______ |
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100.00 % |
Empirical Formula: |
Pd8As2.5Sb0.5 |
Environment: |
Alluvial placers and ultra-basic intrusions. |
IMA Status: |
Approved IMA 1974 |
Locality: |
Itabira, Minas Gerias, Brazil. Link to MinDat.org Location Data. |
Name Origin: |
Named for its composition. |
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Arsenopalladinite Image |
Images:
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Arsenopalladinite Isomertieite Gold Bornite
Comments: Light grayish grain of intimately intergrown isomertieite and arsenopalladinite (in the center of the picture), with pale yellow gold and brownish to violet bornite. Polished section (from microprobe analysis) in reflected light.
Location: Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia.
Scale: Picture size 0.1 mm.
© Thomas Witzke / Abraxas-Verlag |
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Images:
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Arsenopalladinite Crystallography
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Axial Ratios: |
a:b:c =0.5326:1:0.5268 |
Cell Dimensions: |
a = 7.43, b = 13.95, c = 7.35, Z = 4; alpha = 92.88°, beta = 119.5°, gamma = 87.85° V = 661.75 Den(Calc)= 11.04 |
Crystal System: |
Triclinic - PedialH-M Symbol (1) Space Group: P1 |
X Ray Diffraction: |
By Intensity(I/Io): 2.13(1), 2.34(0.6), 1.41(0.4), |
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Physical Properties of Arsenopalladinite
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Color: |
Silver white. |
Density: |
10.4 |
Diaphaniety: |
Opaque |
Habit: |
Anhedral Grains - Granular minerals without the expression of crystal shapes |
Habit: |
Nuggets - Irregular lumps produced by stream transport of malleable metals. |
Hardness: |
4 - Fluorite |
Luster: |
Metallic |
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Optical Properties of Arsenopalladinite
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RL Anisotrophism: |
Strong, red and golden brown to blue-gray in air, khaki-brown to blue gray in oil. |
RL Color: |
White with yellowish creamy tint. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Arsenopalladinite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
43.90 |
44.50 |

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| 420 nm |
44.70 |
45.80 |

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| 440 nm |
45.70 |
46.50 |

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| 460 nm |
46.80 |
47.80 |

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| 480 nm |
48.10 |
49.40 |

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| 500 nm |
49.40 |
50.80 |

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| 520 nm |
50.80 |
52.40 |

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| 540 nm |
52.10 |
53.90 |

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| 560 nm |
53.20 |
55.10 |

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| 580 nm |
54.40 |
56.40 |

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| 600 nm |
55.40 |
57.30 |

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| 620 nm |
56.40 |
58.10 |

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| 640 nm |
57.00 |
58.80 |

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| 660 nm |
57.70 |
59.20 |

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| 680 nm |
58.20 |
59.80 |

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| 700 nm |
58.80 |
60.00 |

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Calculated Relative Intensity Colors of Arsenopalladinite in Air
Relative Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
160% |
180% |
190% |
| R1 |
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| R2 |
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Calculated Properties of Arsenopalladinite
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Electron Density: |
relectron=9.56 gm/cc note: rArsenopalladinite =11.0 gm/cc. |
Fermion Index |
Fermion Index = 0.17289 Boson Index = 0.82711 |
Photoelectric: |
PEArsenopalladinite = 218.60 barns/electron U=PEArsenopalladinite x relectron=2,089.54 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Arsenopalladinite is Not Radioactive |
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Arsenopalladinite Classification
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Dana Class: |
2.16.5.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.16)with miscellaneous formulae |
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(2.16.5)Dana Group |
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2.16.5.1 Arsenopalladinite Pd8(As,Sb)3 P1 1 |
Strunz Class: |
II/A.05-40 II - Sulfides and sulphosalts |
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II/A - Alloys and alloylike compounds, with metals of the Platinum series, (Palladium) |
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II/A.05 - Atheneite - Genkinite series |
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II/A.05-10 Atheneite (Pd,Hg)3As P 6/mmm 6/m 2/m 2/m |
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II/A.05-20 Vincentite (Pd,Pt)3(As,Sb,Te) Unk Mono |
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II/A.05-30 Stillwaterite Pd8As3 P 3 3 |
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II/A.05-40 Arsenopalladinite Pd8(As,Sb)3 P1 1 |
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II/A.05-50 Isomertieite Pd11Sb2As2 F d3m 4/m 3 2/m |
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II/A.05-60 Mertieite-I Pd11(Sb,As)4 Unk Hex |
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II/A.05-70 Mertieite-II Pd8(Sb,As)3 R 3c 3m |
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II/A.05-80 Stibiopalladinite Pd5Sb2 P 63mc 6mm |
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II/A.05-90 Palladoarsenide Pd2As P 2/m 2/m |
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II/A.05-100 Palladobismutharsenide Pd2(As,Bi) Pmcn,P 21cn Ortho |
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II/A.05-102 Palladodymite! (Pd,Rh)2As P nma 2/m 2/m 2/m |
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II/A.05-105 Rhodarsenide! (Rh,Pd)2As P nma or Pn2 Ortho |
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II/A.05-110 Majakite PdNiAs Unk Hex |
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II/A.05-112 Menshikovite! Pd3Ni2As3 P 63/m,P 63, or P 6322 Hex |
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II/A.05-115 Polkanovite! Rh12As7 P 63m 6/m |
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II/A.05-120 Genkinite (Pt,Pd)4Sb3 P 41212 4 2 2 |
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Other Arsenopalladinite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Arsenopalladinite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 -École des Mines de Paris
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Print or Cut-and-Paste your Arsenopalladinite Specimen Label here :
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Arsenopalladinite
Pd8(As,Sb)3
Dana No: 2.16.5.1 Strunz No: II/A.05-40
Locality:
Notes:
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