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Imhofite

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Formula:
Tl5.8As15.4S26
System:
Monoclinic
Hardness:
2
Name:
For the professional mineral collector Joseph Imhof (1902-1969), Binn, Binn valley, Switzerland.
May be confused with some habits of lengenbachite.


Classification of Imhofite

Approved
2.HD.30

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
D : With Tl
3.5.11.1

3 : SULFOSALTS
5 : 2.5 < ø < 3
5.5.3

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
5 : Sulpharsenites etc. of Tl

Physical Properties of Imhofite

Hardness (Mohs):
2

Chemical Properties of Imhofite

IMA Formula:
Tl5.8As15.4S26
Elements listed in formula:

Crystallography of Imhofite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.755(5) Å, b = 24.425(15) Å, c = 5.739(3) Å
β = 108.28(9)°
Ratio:
a:b:c = 0.358 : 1 : 0.235
Unit Cell Volume:
V 1,165.30 ų (Calculated from Unit Cell)
Z:
1
Comment:
Setting P21/n.

Type Occurrence of Imhofite

Relationship of Imhofite to other Species

2.HD.05LoránditeTlAsS2
2.HD.05WeissbergiteTlSbS2
2.HD.15ChristiteTlHgAsS3
2.HD.20JankovićiteTl5Sb9(As,Sb)4S22
2.HD.25RebuliteTl5Sb5As8S22
2.HD.35EdenharteriteTlPbAs3S6
2.HD.40JentschiteTlPbAs2SbS6
2.HD.45HutchinsoniteTlPbAs5S9
2.HD.50BernarditeTlAs5S8
2.HD.55SicheriteTlAg2(As,Sb)3S6
2.HD.60GabrieliteTl2AgCu2As3S7
5.5.1LoránditeTlAsS2
5.5.2EllisiteTl3AsS3
5.5.4SimoniteTlHgAs3S6
5.5.6ChristiteTlHgAsS3
5.5.6RouthieriteCuTlHg2As2S6
5.5.7HutchinsoniteTlPbAs5S9
5.5.8WallisiteCuPbTlAs2S5
5.5.9BernarditeTlAs5S8
5.5.10VrbaiteHg3Tl4As8Sb2S20
5.5.11RebuliteTl5Sb5As8S22
5.5.12GillulyiteTl2As7.5Sb0.3S13
5.5.13WeissbergiteTlSbS2
5.5.14Rohaite(Tl,Pb,K)2Cu8.7Sb2S4
5.5.15VaughaniteTlHgSb4S7
5.5.16Chalcothallite(Cu,Fe,Ag)6.3(Tl,K)2SbS4
5.5.17PierrotiteTlSb3As2S8
5.5.18ParapierrotiteTlSb5S8
5.5.19CriddleiteAg2Au3TlSb10S10
5.5.20ChabournéiteTl4Pb2(Sb,As)20S34

Other Names for Imhofite

Name in Other Languages:
German:Imhofit
Simplified Chinese:硫砷铜铊矿
Spanish:Imhofita

Other Information

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

References for Imhofite

Reference List:
Burri, G., Graeser, S., Marumo, F., Nowacki, W. (1965): Imhofit, ein neues Thallium-arsensulfosalz aus dem Lengenbach (Binnatal, Kanton Wallis). Chimia 19, 499-500.

American Mineralogist: 51: 531.

Divjakovic, V., Nowacki, W. (1976): Die Kristallstruktur von Imhofit, Tl5.6As15S25.3. Zeitschrift für Kristallographie 144, 323-333.

American Mineralogist: 54: 1498.

Balić-Žunić, T., Makovicky, E. (1993): Contributions to the crystal chemistry of thallium sulphosalts. I. The O-D nature of imhofite. Neues Jahrbuch für Mineralogie, Abhandlungen 165, 317-330.



Internet Links for Imhofite

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https://www.mindat.org/min-2019.html
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Localities for Imhofite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
China
 
  • Guizhou Province
    • Qianxi'nan Autonomous Prefecture
      • Xingren Co.
Tangfu Xiao (2001): PhD Thesis, University of Québec, Canda.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
[MinRec 8:276, 8:279, 25:140]
Mineral and/or Locality  
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