Mineralogy Database

Fangite Mineral Data

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General Fangite Information

Help on Chemical  Formula: Chemical Formula: Tl3AsS4
Help on Composition: Composition: Molecular Weight = 816.34 gm
   Thallium  75.11 %  Tl
   Arsenic    9.18 %  As
   Sulfur    15.71 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Tl3AsS4
Help on Environment: Environment: Found in vugs with pyrite an other sulfide material of complex composition.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Mercury gold deposit in the southern Oquirrh Mountains of Tooele County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Fangite was named for Jen-Ho Fang in honor of his numerous contributions to crystallography, crystal chemistry, and geostatistics.
Help on Name Pronunciation: Name Pronunciation: Fangite Say FANGITE
Help on Synonym: Synonym: ICSD 74007
  PDF 46-1402

Fangite Image

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  Fangite   Lorandite

Comments: Brown crystals of fangite with red lorandite.
Location: Allchar, Roszdan, FYR Macedonia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Fangite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8193:1:0.8363
Help on Cell Dimensions: Cell Dimensions: a = 8.894, b = 10.855, c = 9.079, Z = 4; V = 876.53 Den(Calc)= 6.19
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.536(1), 2.714(0.87), 3.361(0.71),

Physical Properties of Fangite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Deep dark brown, Red.
Help on Density: Density: 6.185
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: orange

Optical Properties of Fangite

Help on Optical Data: Optical Data: Biaxial (?), b=2.78-2.81

Calculated Properties of Fangite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.16 gm/cc
note: Specific Gravity of Fangite =6.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0011784126
Boson Index = 0.9988215874
Help on Photoelectric: Photoelectric: PEFangite =1,334.34 barns/electron
U=PEFangite x rElectron Density=6,880.13 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fangite is Not Radioactive

Fangite Classification

Help on  Dana Class: Dana Class: (03)Sulfides - Sulfosalts
  (03.02)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.09)Dana Group Fangite Tl3AsS4 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.KA.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.K - Sulfarsenates, Sulfantimonates
  02.KA -Sulfarsenates with (As,Sb)S4 tetrahedra
02.KA.15 Fangite Tl3AsS4 P nma 2/m 2/m 2/m

Other Fangite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.78,p1096-1103,1993) OPTIC PROP.(Am.Min.,Vol.78,p1096-1103,1993)
Help on See Also: 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

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Dana No: Strunz No: 02.KA.15





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