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.
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
Type:
Isotropic
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
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.510 | (40) |
| 3.343 | (100) |
| 3.060 | (50) |
| 3.029 | (63) |
| 2.679 | (48) |
| 2.25 | (37) |
| 1.866 | (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
Associated Minerals Based on Photo Data:
Related Minerals - Nickel-Strunz Grouping
| 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.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
symbol to view information about a locality.
The Locality List
- 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).
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 Valley, Wallis, Switzerland