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Erniggliite

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Formula:
Tl2SnAs2S6
Colour:
Steel gray to black-gray
Hardness:
2 - 3
Specific Gravity:
5.24 (Calculated)
Crystal System:
Trigonal
Name:
Named in honor of Ernst Heinrich Niggli (29 September 1917, Wald, Zürich, Switzerland - 7 December 2001, Bern, Switzerland), professor of mineralogy and petrography at the University of Bern and president for many years of the Lengenbach Working Group.
This page provides mineralogical data about Erniggliite.


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Classification of ErniggliiteHide

Approved
Approval Year:
1987
First Published:
1992
Approval History:
IMA1987-025
2.GA.45

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S
3.4.18.1

3 : SULFOSALTS
4 : ø = 3

Physical Properties of ErniggliiteHide

Transparency:
Opaque
Colour:
Steel gray to black-gray
Streak:
Reddish black
Hardness:
2 - 3 on Mohs scale
Hardness:
VHN10=46 - 49 kg/mm2 - Vickers
Cleavage:
Perfect
Micaceous lamellae are flexible
Fracture:
Micaceous
Density:
5.24 g/cm3 (Calculated)

Optical Data of ErniggliiteHide

Type:
Isotropic
Bireflectance:
None
Reflectivity:
479nmR=28.6%
543nmR=27.3%
587nmR=26.9%
657nmR=25.1%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 28.6%.
Colour in reflected light:
Grayish white
Internal Reflections:
None
Pleochroism:
Non-pleochroic

Chemical Properties of ErniggliiteHide

Formula:
Tl2SnAs2S6

Crystallography of ErniggliiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 6.68 Å, c = 7.16 Å
Ratio:
a:c = 1 : 1.072
Unit Cell V:
276.69 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.510 (40)
3.343 (100)
3.060 (50)
3.029 (63)
2.679 (48)
2.25 (37)
1.866 (38)

Type Occurrence of ErniggliiteHide

Place of Conservation of Type Material:
Natural History Museum, Basel, Switzerland, L 18,393.
Reference:
Graeser, St., Schwander, H., Wulf, R., Edenharter, A. (1992) Erniggliite (Tl2SnAs2S6), a new mineral from Lengenbach, Binntal (Switzerland): description and crystal structure determination based on data from synchrotron radiation. Schweizerische mineralogische und petrographische Mitteilungen: 72: 293-305.

Synonyms of ErniggliiteHide

Other Language Names for ErniggliiteHide

German:Erniggliit
Simplified Chinese:硫砷锡铊矿
Spanish:Erniggliita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Realgar1 photo of Erniggliite associated with Realgar on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.GA.05ProustiteAg3AsS3Trig. 3m (3 2/m) : R3c
2.GA.05PyrargyriteAg3SbS3Trig. 3m : R3c
2.GA.10PyrostilpniteAg3SbS3Mon.
2.GA.10XanthoconiteAg3AsS3Mon. 2/m : B2/b
2.GA.15SamsoniteAg4MnSb2S6Mon. 2/m : P21/m
2.GA.20SkinneriteCu3SbS3Mon. 2/m : P21/b
2.GA.20WitticheniteCu3BiS3Orth. 2 2 2 : P21 21 21
2.GA.25LapieiteNiCuSbS3Orth.
2.GA.25MückeiteNiCu(Bi,Sb)S3Orth. 2 2 2 : P21 21 21
2.GA.25MalyshevitePdCuBiS3Orth. mmm (2/m 2/m 2/m) : Pmmm
2.GA.25LisiguangitePtCuBiS3Orth. 2 2 2 : P21 21 21
2.GA.30AktashiteCu6Hg3As4S12Trig. 3 : R3
2.GA.30GruzdeviteCu6Hg3Sb4S12Trig.
2.GA.30NowackiiteCu6Zn3As4S12Trig. 3 : R3
2.GA.35LaffittiteAgHgAsS3Mon.
2.GA.40RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet. 4 2m : I4 2m
2.GA.40StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6Tet.
2.GA.50BournonitePbCuSbS3Orth. mm2 : Pmn21
2.GA.50SeligmannitePbCuAsS3Orth. mmm (2/m 2/m 2/m) : Pmmn
2.GA.50SoučekitePbCuBi(S,Se)3Orth.

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.

References for ErniggliiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Graeser, St., Schwander, H., Wulf, R., Edenharter, A. (1992) Erniggliite (Tl2SnAs2S6), a new mineral from Lengenbach, Binntal (Switzerland): description and crystal structure determination based on data from synchrotron radiation. Schweizerische mineralogische und petrographische Mitteilungen: 72: 293-305.
New Minerals (1997), New Minerals 1990-1994.

Internet Links for ErniggliiteHide

Localities for ErniggliiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Schw. MPM 72 (1992), 293; AM 78 (1993), 845
Mineral and/or Locality  
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