General Arsenopyrite Information
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Chemical Formula: |
FeAsS |
Composition: |
Molecular Weight = 162.83 gm |
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Iron 34.30 % Fe |
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Arsenic 46.01 % As |
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Sulfur 19.69 % S |
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______ |
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100.00 % |
Empirical Formula: |
Fe3+AsS |
Environment: |
High temperature veins. Found in igneous pegmatites and contact metamorphic rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1847 |
Locality: |
Most common arsenic-bearing mineral found world wide. Link to MinDat.org Location Data. |
Name Origin: |
Named after the minerals chemical composition. |
Synonym: |
Arsenical pyrite |
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Bismuthian Arsenopyrite |
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Cobaltian Arsenopyrite |
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ICSD 62400 |
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Mispickel |
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PDF 42-1320 |
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Arsenopyrite Image |
Images:
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Arsenopyrite Siderite
Comments: White, metallic arsenopyrite and tan siderite crystals.
Location: Panasqueira (2000, 3rd level), in the region of Beira Baixa, Portugal.
Scale: 11 x 7 cm.
© Fabre Minerals |
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Arsenopyrite Crystallography
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Axial Ratios: |
a:b:c =1.0105:1:1.0193 |
Cell Dimensions: |
a = 5.74, b = 5.68, c = 5.79, Z = 4; beta = 112.17° V = 174.82 Den(Calc)= 6.19 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c |
X Ray Diffraction: |
By Intensity(I/Io): 2.662(1), 2.677(1), 2.418(0.95), |
Forms:
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Forms:
[ 0 1 2]
[ 1 1 0]
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Crystal Structure:
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Morimoto N , Clark L A , American Mineralogist , 46 (1961) p.1448-1469, Arsenopyrite crystal-chemical relations, From Freiberg, Germany
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Physical Properties of Arsenopyrite
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Cleavage: |
[110] Distinct |
Color: |
Tin white, Light steel gray. |
Density: |
6.07 |
Diaphaniety: |
Opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Euhedral Crystals - Occurs as well-formed crystals showing good external form. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Habit: |
Striated - Parallel lines on crystal surface or cleavage face. |
Hardness: |
5 - Apatite |
Luminescence: |
None. |
Luster: |
Metallic |
Magnetism: |
Magnetic after heating |
Streak: |
black |
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Optical Properties of Arsenopyrite
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RL Anisotrophism: |
Strong, red-violet. |
RL Color: |
White, faint yellow tint. |
RL Pleochroism: |
Weak, white with bluish tint to faint reddish yell. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Arsenopyrite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
49.90 |
53.00 |

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| 420 nm |
49.20 |
53.00 |

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| 440 nm |
48.50 |
53.00 |

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| 460 nm |
48.30 |
53.00 |

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| 480 nm |
48.50 |
52.80 |

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| 500 nm |
48.90 |
52.70 |

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| 520 nm |
49.40 |
52.40 |

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| 540 nm |
49.70 |
52.00 |

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| 560 nm |
50.20 |
51.60 |

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| 580 nm |
50.50 |
51.30 |

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| 600 nm |
50.80 |
51.10 |

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| 620 nm |
51.00 |
50.80 |

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| 640 nm |
51.10 |
50.70 |

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| 660 nm |
51.10 |
50.60 |

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| 680 nm |
51.10 |
50.50 |

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| 700 nm |
51.00 |
50.50 |

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Calculated Relative Intensity Colors of Arsenopyrite 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 Arsenopyrite
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Electron Density: |
relectron=5.70 gm/cc note: rArsenopyrite =6.19 gm/cc. |
Fermion Index |
Fermion Index = 0.00874 Boson Index = 0.99126 |
Photoelectric: |
PEArsenopyrite = 44.13 barns/electron U=PEArsenopyrite x relectron= 251.61 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Arsenopyrite is Not Radioactive |
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Arsenopyrite Classification
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Dana Class: |
2.12.4.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.12)where Am Bn Xp, with (m+n):p=1:2 |
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(2.12.4)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic)) |
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2.12.4.1 Arsenopyrite FeAsS P 21/c 2/m |
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2.12.4.2 Gudmundite FeSbS P 21/n 2/m |
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2.12.4.3 Osarsite (Os,Ru)AsS P 21/c 2/m |
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2.12.4.4 Ruarsite RuAsS P 21/c 2/m |
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2.12.4.5 Iridarsenite (Ir,Ru)As2 P 21/c 2/m |
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2.12.4.6 Clinosafflorite (Co,Fe,Ni)As2 P 21/n 2/m |
Strunz Class: |
II/D.22-10 II - Sulfides and sulphosalts |
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II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold |
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II/D.22 - Arsenopyrite series |
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II/D.22-10 Arsenopyrite FeAsS P 21/c 2/m |
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II/D.22-20 Glaucodot (Co,Fe)AsS C mmm 2/m 2/m 2/m |
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II/D.22-30 Gudmundite FeSbS P 21/n 2/m |
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II/D.22-40 Ruarsite RuAsS P 21/c 2/m |
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II/D.22-50 Osarsite (Os,Ru)AsS P 21/c 2/m |
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II/D.22-60 Alloclasite (Co,Fe)AsS P 22121 2 2 2 |
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Other Arsenopyrite Information
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References: |
NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Arsenopyrite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 -Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Applied Mineralogy
6 -Athena
7 - Crocoite.com Mineral Locations
8 - EUROmin Project
9 - Franklin Minerals(Dunn)
10 - Franklin Minerals(Palache)
11 -Google Images
12 -Google Scholar
13 -Handbook of Mineralogy (UofA)
14 - HyperPhysics
15 -MinDAT
16 -MinMax(Deutsch)
17 -MinMax(English)
18 - Mineral and Gemstone Kingdom
19 -Mineralienatlas (Deutsch)
20 - Minerals of Wisconsin
21 - Philatelic Mineralogy
22 -QUT Mineral Atlas
23 - Scandinavian mineral gallery
24 - WWW-MINCRYST
25 -theimage
26 -École des Mines de Paris
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Arsenopyrite
FeAsS
Dana No: 2.12.4.1 Strunz No: II/D.22-10
Locality:
Notes:
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