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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)'.




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Classification of ÉcrinsiteHide

Approved
Approval Year:
2016

Physical Properties of ÉcrinsiteHide

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 ÉcrinsiteHide

Type:
Anisotropic
Anisotropism:
distinct, grey rotation tints
Reflectivity:
470nmR1=37.3%R2=38.6%
546nmR1=35.2%R2=36.7%
589nmR1=34.0%R2=35.5%
650nmR1=32.0%R2=33.3%

Reflectance graph
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 ÉcrinsiteHide

Formula:
AgTl3Pb4As11Sb9S36

Can derived from the formula of baumhauerite by a Sb-for-As and [(Tl,Ag)++(As,Sb)3+]-for-2Pb2+ substitution.

Crystallography of ÉcrinsiteHide

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)°
Ratio:
a:b:c = 0.947 : 1 : 2.65
Unit Cell V:
1546.7 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 ÉcrinsiteHide

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 ÉcrinsiteHide

Relationship of Écrinsite to other SpeciesHide

Member of:
Other Members of this group:
ArgentobaumhaueriteAg1.5Pb22As33.5S72Tric. 1 : P1
ArgentodufrénoysiteAg3Pb26As35S80Tric. 1 : P1
ArgentoliveingiteAgxPb40-2xAs48+xS112Tric. 1 : P1
BarikaiteAg3Pb10(Sb8As11)S40Mon. 2/m : P21/b
BaumhaueritePb12As16S36Tric. 1 : P1
BernarlottiitePb6(As5Sb3)S18Tric. 1 : P1
BoscardiniteTlPb4(Sb7As2)S18Tric. 1 : P1
Carducciite(Ag2Sb2)Pb12(As,Sb)16S40Mon. 2/m : P21/b
DufrénoysitePb2As2S5Mon. 2 : P21
EnneasartoriteTl6Pb32As70S140Mon. 2/m : P21/b
GuettarditePbAsSbS4Mon. 2/m : P21/b
HendekasartoriteTl2Pb48As82S172Mon. 2/m : P21/b
HeptasartoriteTl7Pb22As55S108Mon. 2/m : P21/b
HyršlitePb8As10Sb6S32Mon. 2 : P21
IncomsartoriteTl6Pb144As246S516Mon. 2/m
LiveingitePb9As13S28Mon.
ParapierrotiteTlSb5S8Mon. m
PhilrothiteTlAs3S5Mon. 2/m : P21/b
PierrotiteTl2(Sb,As)10S16Orth. mm2 : Pna21
PolloneiteAgPb46As26Sb23S120Mon. 2 : P21
RathiteAg2Pb12-xTlx/2As18+x/2S40Mon. 2/m : P21/b
SartoritePbAs2S4Mon. 2/m : P21/m
Twinnite Pb0.8Tl0.1Sb1.3As0.8S4Mon. 2/m
VeenitePb2(Sb,As)2S5Mon. 2 : P21

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 ÉcrinsiteHide

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 ÉcrinsiteHide

Localities for ÉcrinsiteHide

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.
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Hautes-Alpes
      • La Chapelle-en-Valgaudemar (La Chapelle-en-Valgaudémar)
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.
Mineral and/or Locality  
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