General Xanthoconite Information
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Chemical Formula: |
Ag3AsS3 |
Composition: |
Molecular Weight = 494.72 gm |
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Silver 65.41 % Ag |
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Arsenic 15.14 % As |
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Sulfur 19.44 % S |
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______ |
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100.00 % |
Empirical Formula: |
Ag3AsS3 |
Environment: |
Usually associated with other silver sulfosalts in hydrothermal veins. |
IMA Status: |
Valid Species (Pre-IMA) 1840 |
Locality: |
Freiberg, Germany. Link to MinDat.org Location Data. |
Name Origin: |
From the Greek xanthos, "yellow" and konis "powder." |
Synonym: |
ICSD 36352 |
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PDF 21-1455 |
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Rittingerite |
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Xanthoconite Image |
Images:
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Xanthoconite
Comments: Wine-colored, tabular crystal of xanthoconite on matrix.
Location: Schlema, Schlema-Hartenstein area, Erzgebirge, Saxony, Germany.
Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag |
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Xanthoconite Crystallography
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Axial Ratios: |
a:b:c =2.7342:1:1.9307 |
Cell Dimensions: |
a = 16.98, b = 6.21, c = 11.99, Z = 8; beta = 110.167° V = 1,186.78 Den(Calc)= 5.54 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a |
X Ray Diffraction: |
By Intensity(I/Io): 3(1), 2.82(0.6), 3.14(0.3), |
Forms:
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Forms:
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Crystal Structure:
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Engel P , Nowacki W , Acta Crystallographica, Section B , 24 (1968) p.77-81, Die kristallstruktur von Ag3AsS3
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Physical Properties of Xanthoconite
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Cleavage: |
[001] Distinct |
Color: |
Dark crimson red, Dark orange, Brown, Lemon yellow. |
Density: |
5.5 - 5.6, Average = 5.55 |
Diaphaniety: |
Subtranslucent to opaque |
Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Habit: |
Reniform - "Kidney like" in shape (e.g.. hematite). |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
2.5-3 - Finger Nail-Calcite |
Luminescence: |
None. |
Luster: |
Adamantine |
Magnetism: |
Nonmagnetic |
Streak: |
orange yellow |
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Optical Properties of Xanthoconite
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Optical Data: |
Biaxial (-), b=3, 2V(Meas)=34. Dispersion r < v. |
RL Color: |
Lemon yellow. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Xanthoconite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
33.70 |
37.10 |

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| 420 nm |
32.20 |
36.10 |

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| 440 nm |
30.70 |
35.10 |

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| 460 nm |
29.10 |
33.70 |

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| 480 nm |
27.60 |
32.10 |

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| 500 nm |
26.10 |
30.10 |

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| 520 nm |
24.80 |
28.50 |

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| 540 nm |
23.70 |
27.30 |

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| 560 nm |
22.70 |
26.30 |

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| 580 nm |
22.00 |
25.50 |

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| 600 nm |
21.50 |
24.80 |

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| 620 nm |
21.30 |
24.40 |

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| 640 nm |
21.00 |
24.10 |

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| 660 nm |
20.80 |
23.80 |

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| 680 nm |
20.60 |
23.60 |

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| 700 nm |
20.40 |
23.50 |

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Calculated Relative Intensity Colors of Xanthoconite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
390% |
| R1 |
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| R2 |
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Calculated Properties of Xanthoconite
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Electron Density: |
relectron=4.97 gm/cc note: rXanthoconite =5.54 gm/cc. |
Fermion Index |
Fermion Index = 0.00145 Boson Index = 0.99855 |
Photoelectric: |
PEXanthoconite = 178.15 barns/electron U=PEXanthoconite x relectron= 885.75 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Xanthoconite is Not Radioactive |
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Xanthoconite Classification
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Dana Class: |
3.4.2.1 (3)Sulfides - Sulfosalts |
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(3.4)where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(3.4.2)Dana Group |
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3.4.2.1 Xanthoconite Ag3AsS3 A2/a 2/m |
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3.4.2.2 Pyrostilpnite Ag3SbS3 P 21/c 2/m |
Strunz Class: |
II/E.07-30 II - Sulfides and sulphosalts |
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II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Silver, x = 6.0 - 1.6 |
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II/E.07 - Proustite - Samsonite series |
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II/E.07-10 Proustite Ag3AsS3 R 3c 3 2/m |
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II/E.07-20 Pyrargyrite Ag3SbS3 R 3c 3m |
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II/E.07-30 Xanthoconite Ag3AsS3 A2/a 2/m |
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II/E.07-40 Pyrostilpnite Ag3SbS3 P 21/c 2/m |
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II/E.07-50 Samsonite Ag4MnSb2S6 P 2/n 2/m |
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II/E.07-60 Quadratite! Ag(Cd,Pb)AsS3 I 4/amd 4/m 2/m 2/m |
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Other Xanthoconite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Xanthoconite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Xanthoconite Specimen Label here :
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Xanthoconite
Ag3AsS3
Dana No: 3.4.2.1 Strunz No: II/E.07-30
Locality:
Notes:
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