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Fangite Mineral Data
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General Fangite Information
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 Chemical Formula: |
Tl3AsS4 |
| Composition: |
Molecular Weight = 816.34 gm |
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Thallium 75.11 % Tl |
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Arsenic 9.18 % As |
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Sulfur 15.71 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Tl3AsS4 |
| Environment: |
Found in vugs with pyrite an other sulfide material of complex composition. |
| IMA Status: |
Approved IMA 1993 |
| Locality: |
Mercury gold deposit in the southern Oquirrh Mountains of Tooele County, Utah, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Fangite was named for Jen-Ho Fang in honor of his numerous contributions to crystallography, crystal chemistry, and geostatistics. |
| Name Pronunciation: |
Fangite  |
| Synonym: |
ICSD 74007 |
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IMA1991-047 |
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PDF 46-1402 |
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Fangite Image |
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Images:
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Fangite Crystallography
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| Axial Ratios: |
a:b:c =0.8193:1:0.8363 |
| Cell Dimensions: |
a = 8.894, b = 10.855, c = 9.079, Z = 4; V = 876.53 Den(Calc)= 6.19 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma |
| X Ray Diffraction: |
By Intensity(I/Io): 2.536(1), 2.714(0.87), 3.361(0.71), |
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Physical Properties of Fangite
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| Cleavage: |
{???} Indistinct |
| Color: |
Deep dark brown, Red. |
| Density: |
6.185 |
| Diaphaneity: |
Translucent |
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
| Hardness: |
2-2.5 - Gypsum-Finger Nail |
| Luster: |
Sub Metallic |
| Streak: |
orange |
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Optical Properties of Fangite
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| Optical Data: |
Biaxial (?), b=2.78-2.81 |
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Calculated Properties of Fangite
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| Electron Density: |
Bulk Density (Electron Density)=5.16 gm/cc
note: Specific Gravity of Fangite =6.19 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0011784126
Boson Index = 0.9988215874 |
| Photoelectric: |
PEFangite =1,334.34 barns/electron
U=PEFangite x rElectron Density=6,880.13 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fangite is Not Radioactive |
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Fangite Classification
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| Dana Class: |
03.02.09.01 (03)Sulfides - Sulfosalts |
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(03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.02.09)Dana Group |
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03.02.09.01 Fangite Tl3AsS4 P nma 2/m 2/m 2/m |
| Strunz Class: |
02.KA.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.K - Sulfarsenates, Sulfantimonates |
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02.KA -Sulfarsenates with (As,Sb)S4 tetrahedra |
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02.KA.15 Fangite Tl3AsS4 P nma 2/m 2/m 2/m |
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Other Fangite Information
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| References: |
PHYS. PROP.(Am.Min.,Vol.78,p1096-1103,1993) OPTIC PROP.(Am.Min.,Vol.78,p1096-1103,1993) |
| See Also: |
Links to other databases for Fangite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Fangite Specimen Label here :
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Fangite
Tl3AsS4
Dana No: 03.02.09.01 Strunz No: 02.KA.15
Locality:
Notes:
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