Fangite Mineral Data + Say FANGITE

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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 Synonym: Synonym: ICSD 74007
  IMA1991-047
  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 - DipyramidalH-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),
Click Here for Large Fangite Structure Window Crystal Structure:

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Help on Above


Wilson J R , Sen Gupta P K , Robinson P D , Criddle A J , American Mineralogist , 78 (1993) p.1096-1103, Fangite, Tl3AsS4, a new thallium arsenic sulfosalt from the Mercur Au deposit,, Utah, and revised optical data for gillulyite

 

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 Diaphaniety: Diaphaniety: 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:

relectron=5.16 gm/cc
note: rFangite =6.19 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00117
Boson Index = 0.99883
Help on Photoelectric: Photoelectric:

PEFangite =1,334.34 barns/electron
U=PEFangite x relectron=6,880.12 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: 3.2.9.1 (3)Sulfides - Sulfosalts
  (3.2)where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (3.2.9)Dana Group
 
3.2.9.1 Fangite Tl3AsS4 P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: II/E.10-10 II - Sulfides and sulphosalts
  II/E - Sulfosalts (S : As,Sb,Bi = x) Sulfosalts with predominant Thallium and Mercury, x = 4.0 - 1.6
  II/E.10 - Fangite series
 
II/E.10-10 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 -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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Fangite

Tl3AsS4
Dana No: 3.2.9.1 Strunz No: II/E.10-10
Locality:

 

Notes:

 

 
   
 
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