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Erniggliite
A valid IMA mineral species
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About Erniggliite
Ernst Niggli (1917-2001)
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 Research Association.
Type Locality:
This page provides mineralogical data about Erniggliite.
Unique Identifiers
Mindat ID:
1403
Long-form identifier:
mindat:1:1:1403:4
IMA Classification of Erniggliite
Approved
IMA Formula:
Tl1+2Sn4+As3+2S2-6
Approval year:
1987
First published:
1992
Approval history:
IMA1987-025
Classification of Erniggliite
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Eni | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
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:
| Wavelength | R1 (%) |
|---|---|
| 479nm | 28.6% |
| 543nm | 27.3% |
| 587nm | 26.9% |
| 657nm | 25.1% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 28.6%.
Colour in reflected light:
Grayish white
Internal Reflections:
None
Pleochroism:
Non-pleochroic
Chemistry of Erniggliite
Mindat Formula:
Tl2SnAs2S6
Element Weights:
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) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Erniggliite
Place of Conservation of Type Material:
Natural History Museum, Basel, Switzerland, L 18,393.
Synonyms of Erniggliite
Other Language Names for Erniggliite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.GA. | Pyradoketosite | Ag3SbS3 |
| 2.GA. | Arsiccioite | AgHg2Tl(As,Sb)2S6 |
| 2.GA. | Eckerite | Ag2CuAsS3 |
| 2.GA.05 | Proustite | Ag3AsS3 |
| 2.GA.05 | Pyrargyrite | Ag3SbS3 |
| 2.GA.10 | Xanthoconite | Ag3AsS3 |
| 2.GA.10 | Pyrostilpnite | Ag3SbS3 |
| 2.GA.15 | Samsonite | Ag4MnSb2S6 |
| 2.GA.20 | Bytízite | Cu3SbSe3 |
| 2.GA.20 | Skinnerite | Cu3SbS3 |
| 2.GA.20 | Wittichenite | Cu3BiS3 |
| 2.GA.25 | Lapieite | NiCuSbS3 |
| 2.GA.25 | Lisiguangite | PtCuBiS3 |
| 2.GA.25 | Malyshevite | PdCuBiS3 |
| 2.GA.25 | Roterbärite | PdBiCuSe3 |
| 2.GA.25 | Mückeite | NiCu(Bi,Sb)S3 |
| 2.GA.30 | Aktashite | Cu6Hg3As4S12 |
| 2.GA.30 | Nowackiite | Cu6Zn3As4S12 |
| 2.GA.30 | Zhengminghuaite | Cu6Fe3As4S12 |
| 2.GA.30 | Gruzdevite | Cu6Hg3Sb4S12 |
| 2.GA.35 | Laffittite | AgHgAsS3 |
| 2.GA.40 | 'Unnamed (Ag-Fe endmember of Routhierite Group)' | AgFe2TlAs2S6 |
| 2.GA.40 | Routhierite | Tl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6 |
| 2.GA.40 | Stalderite | Tl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6 |
| 2.GA.40 | Ralphcannonite | AgZn2TlAs2S6 |
| 2.GA.40 | Ferrostalderite | CuFe2TlAs2S6 |
| 2.GA.50 | Cerromojonite | CuPbBiSe3 |
| 2.GA.50 | Seligmannite | PbCuAsS3 |
| 2.GA.50 | Součekite | CuPbBi(S,Se)3 |
| 2.GA.50 | 'Unnamed (Pb-Cu-Bi Selenide)' | PbCuBiSe3 |
| 2.GA.50 | Bournonite | PbCuSbS3 |
| 2.GA.55 | Eldragónite | Cu6BiSe4(Se2) |
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.
Internet Links for Erniggliite
mindat.org URL:
https://www.mindat.org/min-1403.html
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References for Erniggliite
Reference List:
Localities for Erniggliite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Switzerland (TL) | |
| Schw. MPM 72 (1992) +1 other reference |
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Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland