Stibiosegnitite
A valid IMA mineral species
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About Stibiosegnitite
Formula:
Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6
Colour:
olive-green
Lustre:
Adamantine, Dull, Earthy
Hardness:
4
Crystal System:
Trigonal
Member of:
Name:
The name of the mineral reflects its close relationship with segnitite from which it can be obtained via the coupled heterovalent substitution Fe0.5 3+ + (AsO3OH)2– Sb5+ 0.5 + (AsO4) 3– .
This page provides mineralogical data about Stibiosegnitite.
Unique Identifiers
Mindat ID:
471623
Long-form identifier:
mindat:1:1:471623:1
IMA Classification of Stibiosegnitite
Approved
IMA Formula:
Pb2+(Fe3+2.5Sb5+0.5)(As5+O4)2(OH)6
Approval year:
2024
Type description reference:
Kasatkin, Anatoly V.; Zubkova, Natalia V.; Škoda, Radek; Chukanov, Nikita V.; Gurzhiy, Vladislav V.; Nestola, Fabrizio; Agakhanov, Atali A.; Belakovskiy, Dmitry I.; Lednev, Vladimir S.; Milshina, Maria D. (2026) Stibiosegnitite, Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6, a new member of the alunite supergroup from the Murzinskoe gold deposit, Altai Krai, Russia. Mineralogical Magazine, 90 (4). p.749-759. doi:10.1180/mgm.2025.10150
Classification of Stibiosegnitite
8.BL.10
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
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 |
|---|---|---|
| Ssgt | 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 Stibiosegnitite
Adamantine, Dull, Earthy
Transparency:
Transparent, Translucent
Comment:
adamantine in crystals to dull earthy in aggregates
Colour:
Olive-green
Comment:
greenish-yellow is less common while orange and brown colours are rare
Streak:
Greenish-yellow
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
distinct on {001}
distinct on {001}
Fracture:
Irregular/Uneven
Optical Data of Stibiosegnitite
Type:
Uniaxial (-)
RI values:
nω = 1.935(10) nε = 1.920 - 10
Max. Birefringence:
δ = 0.015
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Non-pleochroic
Chemistry of Stibiosegnitite
Mindat Formula:
Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6
Element Weights:
Crystallography of Stibiosegnitite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 7.3462(7) Å, c = 17.115(2) Å
Ratio:
a:c = 1 : 2.33
Unit Cell V:
799.90 ų (Calculated from Unit Cell)
Z:
3
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.967 Å | (83) |
| 3.674 Å | (51) |
| 3.088 Å | (100) |
| 2.857 Å | (31) |
| 2.554 Å | (17) |
| 2.284 Å | (23) |
| 1.988 Å | (22) |
| 1.837 Å | (15) |
Reference:
Kasatkin, Anatoly V.; Zubkova, Natalia V.; Škoda, Radek; Chukanov, Nikita V.; Gurzhiy, Vladislav V.; Nestola, Fabrizio; Agakhanov, Atali A.; Belakovskiy, Dmitry I.; Lednev, Vladimir S.; Milshina, Maria D. (2026) Stibiosegnitite, Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6, a new member of the alunite supergroup from the Murzinskoe gold deposit, Altai Krai, Russia. Mineralogical Magazine, 90 (4). p.749-759. doi:10.1180/mgm.2025.10150
Type Occurrence of Stibiosegnitite
General Appearance of Type Material:
pseudo-cuboctahedral crystals up to 0.02 mm grouped in compact aggregates forming thick crust 8 x 6 cm
forms spherulites up to 1 mm, rhombohedral crystals up to 0.8 mm and crusts (up to 2 mm thick of various colours covering areas up to 10 cm2 on quartz-limonite matrix.
forms spherulites up to 1 mm, rhombohedral crystals up to 0.8 mm and crusts (up to 2 mm thick of various colours covering areas up to 10 cm2 on quartz-limonite matrix.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6154/1
Geological Setting of Type Material:
The oxidation zone is well developed; its depth reaches 130 m.
Associated Minerals at Type Locality:
Reference:
Kasatkin, Anatoly V.; Zubkova, Natalia V.; Škoda, Radek; Chukanov, Nikita V.; Gurzhiy, Vladislav V.; Nestola, Fabrizio; Agakhanov, Atali A.; Belakovskiy, Dmitry I.; Lednev, Vladimir S.; Milshina, Maria D. (2026) Stibiosegnitite, Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6, a new member of the alunite supergroup from the Murzinskoe gold deposit, Altai Krai, Russia. Mineralogical Magazine, 90 (4). p.749-759. doi:10.1180/mgm.2025.10150
Synonyms of Stibiosegnitite
Other Language Names for Stibiosegnitite
Dutch:Stibiosegnitiet
German:Stibiosegnitit
Relationship of Stibiosegnitite to other Species
Member of:
Other Members of Alunite Supergroup:
| Alunite Group | A0.5-1 B3[SO4]2(OH)6 | |
| Beudantite Group | AM3(XO4)(SO4)(OH)6 | |
| Dussertite Group | Comprises arsenate members of Ca, Sr, Ba and Pb. | |
| Plumbogummite Group | A subgroup of the Alunite Supergroup. | |
| 'Unnamed (Ba-Fe Vanadate)' | Ba, Fe, V, O, H |
Common Associates
Related Minerals - Strunz-mindat Grouping
| 8.BL. | Kiryuite | NaMnAl(PO4)F3 |
| 8.BL. | Metaheimite | PbCu2(AsO4)(OH)3 |
| 8.BL. | Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 |
| 8.BL. | Cloudite | BaFe3+3(PO4)(SO4)(OH)6 |
| 8.BL. | Oberwolfachite | SrFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL. | Arsenobenauite | SrFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.05 | Gallobeudantite | PbGa3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Slottaite | SrFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Corkite | PbFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Hidalgoite | PbAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Hinsdalite | PbAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | 'UM2011-07-POSO:AlBaH' | BaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Kemmlitzite | SrAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Weilerite | BaAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| 8.BL.10 | Segnitite | PbFe3+3AsO4(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Galloplumbogummite | Pb(Ga,Al,Ge)3(PO4)2(OH)6 |
| 8.BL.10 va | 'Viséite' | |
| 8.BL.10 | Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Benauite | SrFe3+3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Crandallite | CaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Springcreekite | BaV3+3(PO4)2(OH,H2O)6 |
| 8.BL.10 | Eylettersite | Th0.75Al3(PO4)2(OH)6 |
| 8.BL.10 | Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Gorceixite | BaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Goyazite | SrAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.13 | Florencite-(Ce) | CeAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(La) | LaAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Nd) | NdAl3(PO4)2(OH)6 |
| 8.BL.13 | Zaïrite | BiFe3+3(PO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenoflorencite-(Nd)' | NdAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Unnamed (As-analogue of Zaïrite)' | (Bi,Pb)Fe3+3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 |
| 8.BL.13 | Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenowaylandite' | BiAl3(AsO4)2(OH)6 |
| 8.BL.13 | Waylandite | BiAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Sm) | SmAl3(PO4)2(OH)6 |
| 8.BL.15 | Viitaniemiite | Na(Ca,Mn2+)Al(PO4)(F,OH)3 |
| 8.BL.25 | Pattersonite | PbFe3+3(PO4)2(OH)5 · H2O |
Fluorescence of Stibiosegnitite
none
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 Stibiosegnitite
mindat.org URL:
https://www.mindat.org/min-471623.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Stibiosegnitite
Reference List:
Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 83. European Journal of Mineralogy, 37 (1). 75-78 doi:10.5194/ejm-37-75-2025
Kasatkin, Anatoly V.; Zubkova, Natalia V.; Škoda, Radek; Chukanov, Nikita V.; Gurzhiy, Vladislav V.; Nestola, Fabrizio; Agakhanov, Atali A.; Belakovskiy, Dmitry I.; Lednev, Vladimir S.; Milshina, Maria D. (2026) Stibiosegnitite, Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6, a new member of the alunite supergroup from the Murzinskoe gold deposit, Altai Krai, Russia. Mineralogical Magazine, 90 (4). p.749-759. doi:10.1180/mgm.2025.10150
Localities for Stibiosegnitite
Showing 5 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.
Austria | |
| Kolitsch et al. (2026) |
Russia (TL) | |
| Bosi et al. (2025) +1 other reference |
Slovakia | |
| Kasatkin et al. (2026) |
| Kasatkin et al. (2026) |
Switzerland | |
| P. Roth et al. (2026) |
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Tgaus la Crusch, Panix Valley, Ilanz/Glion, Surselva Region, Grisons, Switzerland