Fangite Mineral Data

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.

Name Pronunciation:

Fangite

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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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

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

Optical Properties of Fangite

Optical Data:

Biaxial (?), b=2.78-2.81

Calculated Properties of Fangite

Electron Density:

Bulk Density (Electron Density)=5.16 gm/cc
note: Specific Gravity of Fangite =6.19 gm/cc.

Fermion Index:

Fermion Index = 0.0011784126
Boson Index = 0.9988215874

Photoelectric:

PE_Fangite=1,334.34 barns/electron
U=PE_Fangite x rElectron Density=6,880.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fangite is Not Radioactive

Fangite Classification

Dana Class:

03.02.09.01 (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

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

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

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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Ask about Fangite here :
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Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Fangite Specimen Label here :

Fangite

Tl3AsS4
Dana No: 03.02.09.01 Strunz No: 02.KA.15
Locality:

Notes: