Erniggliite
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About Erniggliite
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 Association.
Type Locality:
This page provides mineralogical data about Erniggliite.
Classification of Erniggliite
Approved
Approval year:
1987
First published:
1992
Approval history:
IMA1987-025
2/E.12-45
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
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
3 : SULFOSALTS
4 : ø = 3
Physical Properties of Erniggliite
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
Micaceous lamellae are flexible
Fracture:
Micaceous
Density:
5.24 g/cm3 (Calculated)
Optical Data of Erniggliite
Bireflectance:
None
Reflectivity:
479nm | R=28.6% |
543nm | R=27.3% |
587nm | R=26.9% |
657nm | R=25.1% |
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 Erniggliite
Formula:
Tl2SnAs2S6
Elements listed:
Crystallography of Erniggliite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
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)
Z:
1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0015406 | Erniggliite | Graeser S, 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 | 1992 | Lengenbach, Binntal, Switzerland | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.510 Å | (40) |
3.343 Å | (100) |
3.060 Å | (50) |
3.029 Å | (63) |
2.679 Å | (48) |
2.25 Å | (37) |
1.866 Å | (38) |
Type Occurrence of Erniggliite
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 Erniggliite
Other Language Names for Erniggliite
Common Associates
Related Minerals - Nickel-Strunz Grouping
2.GA. | Arsiccioite | AgHg2Tl(As,Sb)2S6 | Tet. 4 2m : I4 2m |
2.GA. | Eckerite | Ag2CuAsS3 | Mon. 2/m : B2/b |
2.GA.05 | Proustite | Ag3AsS3 | Trig. 3m (3 2/m) : R3c |
2.GA.05 | Pyrargyrite | Ag3SbS3 | Trig. 3m : R3c |
2.GA.10 | Pyrostilpnite | Ag3SbS3 | Mon. 2/m : P21/b |
2.GA.10 | Xanthoconite | Ag3AsS3 | Mon. 2/m : B2/b |
2.GA.15 | Samsonite | Ag4MnSb2S6 | Mon. 2/m : P21/m |
2.GA.20 | Skinnerite | Cu3SbS3 | Mon. 2/m : P21/b |
2.GA.20 | Wittichenite | Cu3BiS3 | Orth. 2 2 2 : P21 21 21 |
2.GA.25 | Lapieite | NiCuSbS3 | Orth. |
2.GA.25 | Mückeite | NiCu(Bi,Sb)S3 | Orth. 2 2 2 : P21 21 21 |
2.GA.25 | Malyshevite | PdCuBiS3 | Orth. mmm (2/m 2/m 2/m) : Pmmm |
2.GA.25 | Lisiguangite | PtCuBiS3 | Orth. 2 2 2 : P21 21 21 |
2.GA.30 | Aktashite | Cu6Hg3As4S12 | Trig. 3 : R3 |
2.GA.30 | Gruzdevite | Cu6Hg3Sb4S12 | Trig. |
2.GA.30 | Nowackiite | Cu6Zn3As4S12 | Trig. 3 : R3 |
2.GA.35 | Laffittite | AgHgAsS3 | Mon. |
2.GA.40 | Routhierite | Tl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6 | Tet. 4 2m : I4 2m |
2.GA.40 | Stalderite | Tl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6 | Tet. |
2.GA.50 | Bournonite | PbCuSbS3 | Orth. mm2 : Pmn21 |
2.GA.50 | Seligmannite | PbCuAsS3 | Orth. mmm (2/m 2/m 2/m) : Pmmn |
2.GA.50 | Součekite | PbCuBi(S,Se)3 | Orth. |
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 Erniggliite
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 Erniggliite
mindat.org URL:
https://www.mindat.org/min-1403.html
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Localities for Erniggliite
Locality List




All localities listed without proper references should be considered as questionable.
Switzerland (TL) | |
| Schw. MPM 72 (1992), 293; AM 78 (1993), 845 |
Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland