Ústalečite Subgroup
A group of related mineral species
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Formula:
(Cu4(◻,Cu)2(Cu4Cu+2)((Te,Sb,As)2Te2)Se12Se
Minerals from this subgroup are compositionally analogous to those of the Goldfieldite Subgroup by the substitution of (Se12Se) for (S12S).
Member of:
Biagioni et al., 2020 propose a series for Te-rich members of the tetrahedrite group where 1 apfu < Te < 4 apfu; tetrahedrite (sensu lato) group minerals with Te < 1 apfu belong to the tetrahedrite or tennantite series (depending on whether Sb>As or As>Sb).
Tetrahedrite (sensu lato) group minerals with Te > 3 apfu are goldfieldite (sensu stricto). Group members where 1 apfu < Te < 3 apfu will receive new names; tentatively "stibiogoldfieldite", Cu6(Cu4Cu+2)(Sb2Te2)S12S, and "arsenogoldfieldite", Cu6(Cu4Cu+2)(As2Te2)S12S, have been applied. Note that all of these compositions are S-dominant in the Y and Z sites.
However, with the discovery of stibioústalečite, the Se-dominant analogue of stibiogoldfieldite, the new "ústalečite" root-name was necessary to accommodate the new 1 apfu < Te < 3 apfu tetrahedrite group composition where Se dominates the Y and Z sites.
Tetrahedrite (sensu lato) group minerals with Te > 3 apfu are goldfieldite (sensu stricto). Group members where 1 apfu < Te < 3 apfu will receive new names; tentatively "stibiogoldfieldite", Cu6(Cu4Cu+2)(Sb2Te2)S12S, and "arsenogoldfieldite", Cu6(Cu4Cu+2)(As2Te2)S12S, have been applied. Note that all of these compositions are S-dominant in the Y and Z sites.
However, with the discovery of stibioústalečite, the Se-dominant analogue of stibiogoldfieldite, the new "ústalečite" root-name was necessary to accommodate the new 1 apfu < Te < 3 apfu tetrahedrite group composition where Se dominates the Y and Z sites.
Name Encoding
CP1252:
Ústalecite Subgroup
Latin-1:
Ústalecite Subgroup
ASCII-7:
Ustalecite Subgroup
Unique Identifiers
Mindat ID:
55770
Long-form identifier:
mindat:1:1:55770:8
Chemistry of Ústalečite Subgroup
Mindat Formula:
(Cu4(◻,Cu)2(Cu4Cu+2)((Te,Sb,As)2Te2)Se12Se
Minerals from this subgroup are compositionally analogous to those of the Goldfieldite Subgroup by the substitution of (Se12Se) for (S12S).
Minerals from this subgroup are compositionally analogous to those of the Goldfieldite Subgroup by the substitution of (Se12Se) for (S12S).
Relationship of Ústalečite Subgroup to other Species
Member of:
Other Members of Tetrahedrite Group:
| Annivite Subgroup | Cu6(Cu4 C2+2)Bi4S12S | |
| Arsenofreibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C2+2)As4S12S0-1 | |
| Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 | Iso. 43m : I43m |
| Giraudite Subgroup | Cu6(Cu4 C2+2)As4Se12Se | |
| Goldfieldite Subgroup | (Cu4(◻,Cu)2(Cu4Cu+2)((Te,Sb,As)2Te2)S12S | |
| Hakite Subgroup | Cu6(Cu4 C2+2)Sb4Se12Se | |
| Pošepnýite | (Cu+3◻3)(Hg2+4Cu+2)Sb4Se12(Se0.5◻0.5) | Iso. 43m : I43m |
| Rozhdestvenskayaite Subgroup | (Ag6,[Ag6]4+)(Ag4 C2+2)Sb4S12S0-1 | |
| Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S | Iso. 43m : I43m |
| Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S | Iso. 43m : I43m |
| Zvěstovite Subgroup | (Ag6,[Ag6]4+)(Ag4 C2+2)As4S12S0-1 |
Ústalečite Subgroup Members:
| Arsenoústalečite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)Se12Se | Iso. 43m : I43m |
| Stibioústalečite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)Se12Se | Iso. 43m : I43m |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
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 Ústalečite Subgroup
mindat.org URL:
https://www.mindat.org/min-55770.html
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References for Ústalečite Subgroup
Reference List:
Localities for Ústalečite Subgroup
Showing 4 localities.
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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.
Czech Republic | |
| [Arsenoústalečite, Stibioústalečite] Miyawaki et al. (2021) +1 other reference |
Russia | |
| Kudaeva et al. (2024) |
| Pekov et al. (2026) |
