General Duranusite Information
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Chemical Formula: |
As4S |
Composition: |
Molecular Weight = 331.75 gm |
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Arsenic 90.33 % As |
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Sulfur 9.67 % S |
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______ |
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100.00 % |
Empirical Formula: |
As4S |
Environment: |
Realgar has been altered by deuteric solutions to form the rare mineral duranusite, |
IMA Status: |
Approved IMA 1973 |
Locality: |
Duranus, Alpes-Meritimes, France. Mina Capillitas, an epithermal deposit in the Province of Catamarca, Argentina. Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
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Duranusite Image |
Images:
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Duranusite Crystallography
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Axial Ratios: |
a:b:c =0.529:1:1.4904 |
Cell Dimensions: |
a = 3.576, b = 6.759, c = 10.074, Z = 2; V = 243.49 Den(Calc)= 4.52 |
Crystal System: |
OrthorhombicSpace Group: Unk |
X Ray Diffraction: |
By Intensity(I/Io): 2.919(1), 5.037(0.9), 5.62(0.9), |
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Physical Properties of Duranusite
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Color: |
Red. |
Density: |
4.5 |
Diaphaniety: |
Opaque |
Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
Hardness: |
2 - Gypsum |
Luster: |
Metallic |
Streak: |
black |
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Optical Properties of Duranusite
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RL Color: |
Gray-white with a brownish tint and brownish red internal reflections. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Duranusite in Air
| λ |
R1 |
R2 |
 |
∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
39.00 |
42.00 |

 |
|
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| 420 nm |
36.80 |
39.40 |

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| 440 nm |
34.60 |
36.80 |

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| 460 nm |
33.00 |
34.80 |

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| 480 nm |
32.10 |
33.60 |

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| 500 nm |
31.40 |
32.70 |

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| 520 nm |
30.80 |
32.20 |

 |
| 540 nm |
30.40 |
31.80 |

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| 560 nm |
30.00 |
31.50 |

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| 580 nm |
29.60 |
31.00 |

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| 600 nm |
29.10 |
30.60 |

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| 620 nm |
28.70 |
30.30 |

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| 640 nm |
28.40 |
30.00 |

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| 660 nm |
28.00 |
29.70 |

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| 680 nm |
27.60 |
29.30 |

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| 700 nm |
27.10 |
29.00 |

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Calculated Relative Intensity Colors of Duranusite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
300% |
| R1 |
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| R2 |
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Calculated Properties of Duranusite
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Electron Density: |
relectron=4.03 gm/cc note: rDuranusite =4.52 gm/cc. |
Fermion Index |
Fermion Index = 0.00072 Boson Index = 0.99928 |
Photoelectric: |
PEDuranusite = 65.88 barns/electron U=PEDuranusite x relectron= 265.70 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Duranusite is Not Radioactive |
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Duranusite Classification
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Dana Class: |
2.1.4.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.1)where Am Xp, with m:p>3:1 |
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(2.1.4)Dana Group |
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2.1.4.1 Duranusite As4S Unk Ortho |
Strunz Class: |
II/F.02-10 II - Sulfides and sulphosalts |
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II/F - Sulfides with nonmetallic properties, Arsenic-Sulfides |
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II/F.02 - Duranusite - Jeromite series |
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II/F.02-10 Duranusite As4S Unk Ortho |
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II/F.02-20 Dimorphite As4S3 P nma 2/m 2/m 2/m |
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II/F.02-30 Realgar AsS P 21/n 2/m |
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II/F.02-40 Pararealgar AsS P 21/c 2/m |
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II/F.02-50 Alacranite As8S9 P 2/c 2/m |
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II/F.02-60 Uzonite As4S5 P 21/m 2/m |
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II/F.02-70 Orpiment As2S3 P 21/n 2/m |
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II/F.02-80 Laphamite As2(Se,S)3 P 21/n 2/m |
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II/F.02-90 Jeromite As(S,Se)2 None |
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Other Duranusite Information
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References: |
NAME( CanMin, 10/99) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Duranusite :
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 Duranusite Specimen Label here :
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Duranusite
As4S
Dana No: 2.1.4.1 Strunz No: II/F.02-10
Locality:
Notes:
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