Fangite Mineral Data

Fangite Mineral Data +

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General Fangite Information

Chemical Formula:

Tl3AsS4

Composition:

Molecular Weight = 816.34 gm

Thallium 75.11 % Tl

Arsenic 9.18 % As

Sulfur 15.71 % S

______

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.

Synonym:

ICSD 74007

IMA1991-047

PDF 46-1402

Fangite Image

Images:

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.536(1), 2.714(0.87), 3.361(0.71),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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H - Help Screen
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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

Cleavage:

[???] Indistinct

Color:

Deep dark brown, Red.

Density:

6.185

Diaphaniety:

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

Optical Properties of Fangite

Optical Data:

Biaxial (?), b=2.78-2.81

Calculated Properties of Fangite

Electron Density:

r_electron=5.16 gm/cc
note: r_Fangite=6.19 gm/cc.

Fermion Index

Fermion Index = 0.00117
Boson Index = 0.99883

Photoelectric:

PE_Fangite=1,334.34 barns/electron
U=PE_Fangite x r_electron=6,880.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fangite is Not Radioactive

Fangite Classification

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

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

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 -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 Fangite Specimen Label here :

Fangite

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

Notes: