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Fangite

A valid IMA mineral species
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02960500017271923034520.jpg
Fangite

Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland
00955650017271923056718.jpg
Fangite, etc.

Crven Dol, Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
03797800017271923077483.jpg
Fangite, etc.

Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
02960500017271923034520.jpg
Fangite

Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland
00955650017271923056718.jpg
Fangite, etc.

Crven Dol, Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
03797800017271923077483.jpg
Fangite, etc.

Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
02960500017271923034520.jpg
Fangite

Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland
06351330017271923107470.jpg
Fangite, etc.

Crven Dol, Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
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About FangiteHide

09375850017271923116249.jpg
Dr. Jen-Ho Fang
Formula:
Tl3AsS4
Colour:
Deep red to maroon.
Lustre:
Vitreous, Metallic
Hardness:
2 - 2½
Specific Gravity:
6.185 (Calculated)
Crystal System:
Orthorhombic
Name:
In honor of Dr. Jen-Ho Fang (October 21, 1929, Tainan, Taiwan– May 24, 2020 Salt Lake City, Utah), crystal chemist, University of Alabama, Tuscaloosa, Alabama, USA.
This page provides mineralogical data about Fangite.


Unique IdentifiersHide

Mindat ID:
1452
Long-form identifier:
mindat:1:1:1452:2

Similar NamesHide

FargiteA variety of NatroliteNa2Al2Si3O10 · 2H2O
KangiteA valid IMA mineral species(Sc,Ti,Al,Zr,Mg,Ca,◻)2O3
LangiteA valid IMA mineral species - grandfatheredCu4(SO4)(OH)6 · 2H2O
PhengiteA variety of MuscoviteKAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
YangiteA valid IMA mineral speciesPbMnSi3O8 · H2O

IMA Classification of FangiteHide

Classification of FangiteHide

Strunz-mindat (2026):
2.KA.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
K : Sulfarsenates, Sulfantimonates
A : Sulfarsenates with (As,Sb)S4 tetrahedra
Dana 8th ed.:
3.2.9.1

3 : SULFOSALTS
2 : ø = 4

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
FgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FangiteHide

Lustre:
Vitreous, Metallic
Transparency:
Translucent
Comment:
Tarnishes to metallic
Colour:
Deep red to maroon.
Streak:
Orange
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN100=60 - 63 kg/mm2 - Vickers
Comment:
Synthetic
Fracture:
Conchoidal
Density:
6.185 g/cm3 (Calculated)

Optical Data of FangiteHide

Type:
Biaxial
Bireflectance:
Very low
Dispersion:
relatively strong
Reflectivity:
WavelengthR1 (%)R2 (%)imR1 (%)imR2 (%)
400nm29.1%30.15%13.8%14.7%
420nm28.5%29.5%13.4%14.3%
440nm27.6%28.7%12.7%13.8%
460nm26.8%27.8%12.1%13.0%
470nm26.4%27.35%11.8%12.6%
480nm26.0%26.8%11.5%12.2%
500nm25.2%25.9%10.9%11.5%
520nm24.5%25.0%10.4%10.8%
540nm23.8%24.25%9.89%10.2%
546nm23.65%24.1%9.77%10.1%
560nm23.3%23.6%9.49%9.81%
580nm22.8%23.1%9.13%9.43%
589nm22.5%22.9%8.99%9.27%
600nm22.3%22.7%8.85%9.14%
620nm22.0%22.3%8.66%8.93%
640nm21.7%22.05%8.49%8.74%
650nm21.6%21.95%8.40%8.65%
660nm21.5%21.8%8.32%8.59%
680nm21.3%21.6%8.19%8.43%
700nm21.1%21.5%8.08%8.34%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 30.15%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
Blue-gray
Internal Reflections:
Red

Chemistry of FangiteHide

Mindat Formula:
Tl3AsS4
Element Weights:
Element% weight
Tl75.110 %
S15.712 %
As9.178 %

Calculated from ideal end-member formula.
Tl
S
As
Elements listed:
As, S, Tl - search for minerals with similar chemistry
Common Impurities:
Fe,Cu,Zn,Au,Sb,Se,Te,Ni

Crystallography of FangiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 8.89 Å, b = 10.85 Å, c = 9.07 Å
Ratio:
a:b:c = 0.819 : 1 : 0.836
Unit Cell V:
874.86 ų (Calculated from Unit Cell)
Z:
4

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001617FangiteWilson J R, Sen Gupta P K, Robinson P D, Criddle A J (1993) Fangite, Tl3AsS4, a new thallium arsenic sulfosalt from the Mercur Au deposit, Utah, and revised optical data for gillulyite American Mineralogist 78 1096-110319930293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.813 Å(vs)
3.99 Å(s)
2.264 Å(ms)
4.14 Å(m)
3.80 Å(m)
3.47 Å(m)
3.35 Å(m)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of FangiteHide

Type Locality:
ⓘ Mercur Disseminated Gold Mine (Marion Hill pit), Mercur Mining District, Tooele County, Utah, USA
General Appearance of Type Material:
Irregular to subhedral grains.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 17071.
Geological Setting of Type Material:
A sediment-hosted, disseminated Au deposit.
Associated Minerals at Type Locality:
CalciteOrpimentPyriteRealgar
Reference:
Wilson, James R., Gupta, Pradip K. Sen, Robinson, Paul D., Criddle, Alan J. (1993) Fangite, Tl3AsS4 a new thallium arsenic sulfosalt from the Mercur Au deposit, Utah, and revised optical data for gillulyite. American Mineralogist, 78 (9-10) 1096-1103

Synonyms of FangiteHide

Other Language Names for FangiteHide

Dutch:Fangiet
German:Fangit
Russian:Фангит
Spanish:Fangita

Common AssociatesHide

Associations Based on Photo Data:
8 photos of Fangite associated with OrpimentAs2S3
5 photos of Fangite associated with LoránditeTlAsS2
3 photos of Fangite associated with RaguiniteTlFeS2
2 photos of Fangite associated with RealgarAs4S4

Related Minerals - Strunz-mindat GroupingHide

2.KA.05EnargiteCu3AsS4Orth. mm2 : Pmn21
2.KA.05Petrukite(Cu,Fe,Zn,Ag)3(Sn,In)S4Orth. mm2 : Pmn21
2.KA.10BriartiteCu2FeGeS4Tet.
2.KA.10KeutschiteCu2AgAsS4Tet. 42m : I42m
2.KA.10PermingeatiteCu3SbSe4Tet. 42m : I42m
2.KA.10LuzoniteCu3AsS4Tet. 42m : I42m
2.KA.10BarquilliteCu2CdGeS4Tet. 42m : I42m
2.KA.10FamatiniteCu3SbS4Tet. 42m : I42m
2.KA.10ZincobriartiteCu2(Zn,Fe)(Ge,Ga)S4Tet. 42m : I42m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for FangiteHide

References for FangiteHide

Localities for FangiteHide

Showing 5 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
North Macedonia
 
  • Kavadarci Municipality
    • Ržanovo
El Goresy et al. (1988) +3 other references
Färber (n.d.) +3 other references
Ðorđević et al. (2020)
Switzerland
 
  • Valais
    • Goms
      • Binn
        • Fäld
Roth (2017)
USA (TL)
 
  • Utah
    • Tooele County
      • Mercur Mining District
Wilson et al. (1993)
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