General Vrbaite Information
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Chemical Formula: |
Tl4Hg3Sb2As8S20 |
Composition: |
Molecular Weight = 2,903.50 gm |
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Thallium 28.16 % Tl |
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Mercury 20.73 % Hg |
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Antimony 8.39 % Sb |
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Arsenic 20.64 % As |
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Sulfur 22.09 % S |
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______ |
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100.00 % |
Empirical Formula: |
Tl4Hg3Sb2As8S20 |
Environment: |
Intergrown with realgar and orpiment. |
IMA Status: |
Valid Species (Pre-IMA) 1912 |
Locality: |
Allchar, near Rozsdan, northwest of Salonika, Macedonia, Greece. Link to MinDat.org Location Data. |
Name Origin: |
Named for Karl Vrba (1845-1922), Czech mineralogist. |
Synonym: |
ICSD 15240 |
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PDF 20-1264 |
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Vrbaite Image |
Images:
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Vrbaite Crystallography
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Axial Ratios: |
a:b:c =0.5676:1:0.483 |
Cell Dimensions: |
a = 13.189, b = 23.235, c = 11.223, Z = 2; V = 3,439.25 Den(Calc)= 2.80 |
Crystal System: |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mca |
X Ray Diffraction: |
By Intensity(I/Io): 4.04(1), 2.57(0.8), 3.33(0.8), |
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Physical Properties of Vrbaite
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Cleavage: |
[010] Good |
Color: |
Gray black, Dark red. |
Density: |
5.3 - 2.3, Average = 3.8 |
Diaphaniety: |
Opaque to subtranslucent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
Habit: |
Pyramidal - Crystals are shaped like pyramids. |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
3.5 - Copper Penny |
Luster: |
Metallic |
Streak: |
light red |
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Optical Properties of Vrbaite
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Optical Data: |
Biaxial (+), b=2.72 |
RL Color: |
Bluish white with red internal reflections, dark red in translucent thin splinters. |
Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Vrbaite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
45.80 |
48.60 |

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| 420 nm |
42.00 |
44.60 |

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| 440 nm |
38.20 |
40.60 |

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| 460 nm |
35.70 |
38.20 |

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| 480 nm |
33.80 |
36.70 |

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| 500 nm |
32.20 |
35.30 |

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| 520 nm |
30.80 |
34.00 |

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| 540 nm |
29.60 |
32.50 |

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| 560 nm |
28.60 |
31.10 |

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| 580 nm |
28.00 |
30.00 |

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| 600 nm |
27.60 |
29.20 |

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| 620 nm |
27.30 |
28.80 |

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| 640 nm |
27.10 |
28.80 |

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| 660 nm |
26.80 |
28.60 |

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| 680 nm |
26.60 |
28.40 |

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| 700 nm |
26.40 |
28.00 |

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Calculated Relative Intensity Colors of Vrbaite in Air
Relative Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
310% |
| R1 |
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| R2 |
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Calculated Properties of Vrbaite
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Electron Density: |
relectron=2.41 gm/cc note: rVrbaite =2.80 gm/cc. |
Fermion Index |
Fermion Index = 0.06424 Boson Index = 0.93576 |
Photoelectric: |
PEVrbaite = 867.15 barns/electron U=PEVrbaite x relectron=2,090.60 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Vrbaite is Not Radioactive |
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Vrbaite Classification
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Dana Class: |
3.7.15.1 (3)Sulfides - Sulfosalts |
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(3.7)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(3.7.15)Dana Group |
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3.7.15.1 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m |
Strunz Class: |
II/E.13-40 II - Sulfides and sulphosalts |
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II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6 |
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II/E.13 - Livingstonite - Vaughanite series |
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II/E.13-10 Livingstonite HgSb4S8 A2/a 2/m |
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II/E.13-20 Grumiplucite! HgBi2S4 C 2/m 2/m |
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II/E.13-30 Simonite TlHgAs3S6 P 21/n 2/m |
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II/E.13-40 Vrbaite Tl4Hg3Sb2As8S20 C mca 2/m 2/m 2/m |
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II/E.13-42 Edenharterite TlPbAs3S6 F dd2 mm2 |
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II/E.13-43 Jentschite! TlPbAs2SbS6 P 21/n 2/m |
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II/E.13-45 Hutchinsonite (Pb,Tl)2As5S9 P bca 2/m 2/m 2/m |
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II/E.13-50 Lorandite TlAsS2 P 21/a 2/m |
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II/E.13-60 Weissbergite TlSbS2 P1 1 |
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II/E.13-70 Tvalchrelidzeite Hg12(Sb,As)8S15 P1 1 |
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II/E.13-80 Vaughanite TlHgSb4S7 P1 ? 1 |
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Other Vrbaite Information
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References: |
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
See Also: |
Links to other databases for Vrbaite :
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 - WWW-MINCRYST
13 -École des Mines de Paris
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Print or Cut-and-Paste your Vrbaite Specimen Label here :
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Vrbaite
Tl4Hg3Sb2As8S20
Dana No: 3.7.15.1 Strunz No: II/E.13-40
Locality:
Notes:
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