Écrinsite
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Simplified map of Écrins National Park
Formula:
AgTl3Pb4As11Sb9S36
Can derived from the formula of baumhauerite by a Sb-for-As and [(Tl,Ag)++(As,Sb)3+]-for-2Pb2+ substitution.
Lustre:
Metallic
Hardness:
3 - 3½
Specific Gravity:
4.96 (Calculated)
Crystal System:
Triclinic
Member of:
Name:
Named after Parc National des Écrins, where the Jax Roux locality is situated.
Sartorite homologous series, with N = 3.5, as in baumhauerite, argentobaumhauerite, boscardinite, and bernarlottiite); closely related to the latter two.
Combination of elements is unique. Somewhat similar to 'Unnamed (Tl-Ag-Pb Arsenide-Antimonide-Sulphide)'.
Combination of elements is unique. Somewhat similar to 'Unnamed (Tl-Ag-Pb Arsenide-Antimonide-Sulphide)'.
Classification of Écrinsite
Approved
Approval Year:
2016
Physical Properties of Écrinsite
Metallic
Transparency:
Opaque
Hardness:
3 - 3½ on Mohs scale
Comment:
VHN 175–201 (mean: 189) kg/mm2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.96 g/cm3 (Calculated)
Optical Data of Écrinsite
Type:
Anisotropic
Anisotropism:
distinct, grey rotation tints
Reflectivity:
| 470nm | R1=37.3% | R2=38.6% |
| 546nm | R1=35.2% | R2=36.7% |
| 589nm | R1=34.0% | R2=35.5% |
| 650nm | R1=32.0% | R2=33.3% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 38.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
white
Internal Reflections:
absent
Pleochroism:
Not Visible
Chemical Properties of Écrinsite
Formula:
AgTl3Pb4As11Sb9S36
Can derived from the formula of baumhauerite by a Sb-for-As and [(Tl,Ag)++(As,Sb)3+]-for-2Pb2+ substitution.
Can derived from the formula of baumhauerite by a Sb-for-As and [(Tl,Ag)++(As,Sb)3+]-for-2Pb2+ substitution.
Crystallography of Écrinsite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 8.080(2) Å, b = 8.533(2) Å, c = 22.613(4) Å
α = 90.23(3)°, β = 97.17(3)°, γ = 90.83(3)°
α = 90.23(3)°, β = 97.17(3)°, γ = 90.83(3)°
Ratio:
a:b:c = 0.947 : 1 : 2.65
Unit Cell V:
1546.7 ų
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.22 | (65) |
| 4.14 | (68) |
| 3.86 | (61) |
| 3.72 | (92) |
| 3.56 | (100) |
| 3.53 | (80) |
| 2.794 | (65) |
| 2.133 | (60) |
Type Occurrence of Écrinsite
Place of Conservation of Type Material:
Cotype material: mineralogical collections of the Naturhistorisches Museum Wien, Austria (catalogue number N 9870)
Associated Minerals at Type Locality:
Synonyms of Écrinsite
Relationship of Écrinsite to other Species
Member of:
Other Members of this group:
| Argentobaumhauerite | Ag1.5Pb22As33.5S72 | Tric. 1 : P1 |
| Argentodufrénoysite | Ag3Pb26As35S80 | Tric. 1 : P1 |
| Argentoliveingite | AgxPb40-2xAs48+xS112 | Tric. 1 : P1 |
| Barikaite | Ag3Pb10(Sb8As11)S40 | Mon. 2/m : P21/b |
| Baumhauerite | Pb12As16S36 | Tric. 1 : P1 |
| Bernarlottiite | Pb6(As5Sb3)S18 | Tric. 1 : P1 |
| Boscardinite | TlPb4(Sb7As2)S18 | Tric. 1 : P1 |
| Carducciite | (Ag2Sb2)Pb12(As,Sb)16S40 | Mon. 2/m : P21/b |
| Dekatriasartorite | TlPb58As97S204 | Mon. 2/m : P21/b |
| Dufrénoysite | Pb2As2S5 | Mon. 2 : P21 |
| Enneasartorite | Tl6Pb32As70S140 | Mon. 2/m : P21/b |
| Guettardite | PbAsSbS4 | Mon. 2/m : P21/b |
| Hendekasartorite | Tl2Pb48As82S172 | Mon. 2/m : P21/b |
| Heptasartorite | Tl7Pb22As55S108 | Mon. 2/m : P21/b |
| Hyršlite | Pb8As10Sb6S32 | Mon. 2 : P21 |
| Incomsartorite | Tl6Pb144As246S516 | Mon. 2/m |
| Liveingite | Pb9As13S28 | Mon. |
| Parapierrotite | TlSb5S8 | Mon. m |
| Philrothite | TlAs3S5 | Mon. 2/m : P21/b |
| Pierrotite | Tl2(Sb,As)10S16 | Orth. mm2 : Pna21 |
| Polloneite | AgPb46As26Sb23S120 | Mon. 2 : P21 |
| Rathite | Ag2Pb12-xTlx/2As18+x/2S40 | Mon. 2/m : P21/b |
| Sartorite | PbAs2S4 | Mon. 2/m : P21/m |
| Twinnite | Pb0.8Tl0.1Sb1.3As0.8S4 | Mon. 2/m |
| Veenite | Pb2(Sb,As)2S5 | Mon. 2 : P21 |
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 Écrinsite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Topa, D., Kolitsch, U., Makovicky, E., Favreau, G., Stanley, C., Bourgoin, V., Boulliard, J.-C. (2016) Écrinsite, IMA2015-099. CNMNC Newsletter No. 29, February 2016, 204; Mineralogical Magazine: 80: 199–205.
Topa, D., Kolitsch, U., Makovicky, E., Stanley, C. (2017): Écrinsite, AgTl3Pb4As11Sb9S36, a new thallium-rich homeotype of baumhauerite from the Jas Roux sulphosalt deposit, Parc national des Écrins, Hautes-Alpes, France. European Journal of Mineralogy 29, 689-700.
Internet Links for Écrinsite
mindat.org URL:
https://www.mindat.org/min-47027.html
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Please feel free to link to this page.
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Localities for Écrinsite
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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.
France (TL) | |
| Topa, D., Kolitsch, U., Makovicky, E., Favreau, G., Stanley, C., Bourgoin, V., and Boulliard, J.-C., 2016. Écrinsite, IMA2015-099. CNMNC Newsletter No. 29, February 2016, 204; Mineralogical Magazine 80, 199–205; Topa, D., Kolitsch, U., Makovicky, E., Stanley, C. (2017): Écrinsite, AgTl3Pb4As11Sb9S36, a new thallium-rich homeotype of baumhauerite from the Jas Roux sulphosalt deposit, Parc national des Écrins, Hautes-Alpes, France. European Journal of Mineralogy 29, 689-700. |