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Nioboixiolite-(Fe2+)
A valid IMA mineral species - pending publication
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Formula:
(Nb0.67Fe2+0.33)O2
or maybe better expressed as Nb2Fe2+O6
Colour:
black
Lustre:
Sub-Metallic
Hardness:
5
Specific Gravity:
5.374 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named after iron rich Nioboixiolite
exhibits an α-PbO2-type structure
Unique Identifiers
Mindat ID:
498782
Long-form identifier:
mindat:1:1:498782:2
Similar Names
| Nioboixiolite-([]) | A valid IMA mineral species | (Nb0.8◻0.2)4+O2 |
| Nioboixiolite-(Fe3+) | A valid IMA mineral species | (Nb0.5Fe3+0.5)O2 |
| Nioboixiolite-(Mn2+) | A valid IMA mineral species - pending publication | (Nb0.67Mn2+0.33)O2 |
IMA Classification of Nioboixiolite-(Fe2+)
Approved, Pending publication
IMA Formula:
(Nb2/3Fe2+1/3)O2
Approval year:
2025
Type description reference:
[1]Zelek-Pogudz, Sylwia; Gołębiowska, Bożena; Rutkowski, Bogdan; Jeleń, Piotr; Nejbert, Krzysztof; Stadnicka, Katarzyna M.; Pieczka, Adam (2026) Nioboixiolite-(Fe2+), (Nb2/3Fe2+1/3)O2, a new mineral of the ixiolite group from Jordanów Śląski, Lower Silesia, Poland. Mineralogical Magazine, p.1-28. doi:10.1180/mgm.2026.10244
Classification of Nioboixiolite-(Fe2+)
4.DB.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
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 |
|---|---|---|
| Nbix-Fe2+ | 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 Nioboixiolite-(Fe2+)
Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven, Conchoidal
Density:
5.374 g/cm3 (Calculated)
Optical Data of Nioboixiolite-(Fe2+)
Anisotropism:
weak
Bireflectance:
very weak
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 0nm | 6.8(5% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 6.8(5%.
Colour in reflected light:
gray
Internal Reflections:
none
Pleochroism:
Non-pleochroic
Comments:
slightly darker gray than Nb,Ta-rutile
Chemistry of Nioboixiolite-(Fe2+)
Mindat Formula:
(Nb0.67Fe2+0.33)O2
or maybe better expressed as Nb2Fe2+O6
or maybe better expressed as Nb2Fe2+O6
Element Weights:
Elements listed:
Crystallography of Nioboixiolite-(Fe2+)
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbcn
Setting:
Pbcn
Cell Parameters:
a = 4.7368(2) Å, b = 5.7155(2) Å, c = 5.083(2) Å
Ratio:
a:b:c = 0.829 : 1 : 0.889
Unit Cell V:
137.61 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 15.49 Å | (100) |
| 6.49 Å | (12) |
| 6.22 Å | (34) |
| 5.139 Å | (28) |
| 4.707 Å | (16) |
| 4.305 Å | (16) |
| 3.854 Å | (14) |
| 3.016 Å | (13) |
Locality:
Reference:
[1]Zelek-Pogudz, Sylwia; Gołębiowska, Bożena; Rutkowski, Bogdan; Jeleń, Piotr; Nejbert, Krzysztof; Stadnicka, Katarzyna M.; Pieczka, Adam (2026) Nioboixiolite-(Fe2+), (Nb2/3Fe2+1/3)O2, a new mineral of the ixiolite group from Jordanów Śląski, Lower Silesia, Poland. Mineralogical Magazine, p.1-28. doi:10.1180/mgm.2026.10244
Comments:
diffraction data were collected from a FIB-extracted fragment using a Gandolfi data collection strategy on a single-crystal diffractometer and processed with CrysAlisPro 1.171.44.85
Type Occurrence of Nioboixiolite-(Fe2+)
General Appearance of Type Material:
euhedral prismatic crystals up to 50 μm, scattered in lenticular aggregates of Ti,Nb-bearing minerals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Canadian Museum of Nature, PO Box 3443, Station “D”, Ottawa, Ontario, Canada, catalogue number CMNMC 90989 (holotype), and the Natural History Museum, University of Oslo, PO Box 1172, Blindern, Oslo, Norway, catalogue number KNR 44454 (cotype)
Geological Setting of Type Material:
In the quarry, serpentinite contains two steeply dipping bodies of calc-silicate rocks running approximately northeast-southwest, with widths of ~20–25 m and ~5 m, traditionally called ‘leucocratic zones’. These bodies are surrounded by discontinuous and tectonically disrupted blackwall schists with a thickness ranging from a few centimetres to about one metre, locally grading into nephritic rocks. The rodingite bodies contain strongly metasomatized leucogranite, dated to approximately 340 Ma.
Associated Minerals at Type Locality:
Reference:
[1]Zelek-Pogudz, Sylwia; Gołębiowska, Bożena; Rutkowski, Bogdan; Jeleń, Piotr; Nejbert, Krzysztof; Stadnicka, Katarzyna M.; Pieczka, Adam (2026) Nioboixiolite-(Fe2+), (Nb2/3Fe2+1/3)O2, a new mineral of the ixiolite group from Jordanów Śląski, Lower Silesia, Poland. Mineralogical Magazine, p.1-28. doi:10.1180/mgm.2026.10244
Synonyms of Nioboixiolite-(Fe2+)
Other Language Names for Nioboixiolite-(Fe2+)
Dutch:Nioboixioliet-(Fe2+)
Relationship of Nioboixiolite-(Fe2+) to other Species
Member of:
Other Members of Ixiolite Group:
| Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Scrutinyite | α-PbO2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Seifertite | SiO2 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Srilankite | TiO2 | Orth. mmm(2/m2/m2/m) : Pbcn |
Related Minerals - Strunz-mindat Grouping
| 4.DB. | Tianhongqiite | CrTiO3(OH) |
| 4.DB. | Nioboheftetjernite | ScNbO4 |
| 4.DB. | Huangshanite | Fe3+TaO4 |
| 4.DB. | Nioboixiolite-(Mn2+) | (Nb0.67Mn2+0.33)O2 |
| 4.DB. | Shakhdaraite-(Y) | ScYNb2O8 |
| 4.DB.05 | Varlamoffite | Sn1-xFexO2-x(OH) |
| 4.DB.05 | Argutite | GeO2 |
| 4.DB.05 | Cassiterite | SnO2 |
| 4.DB.05 | Rutile | TiO2 |
| 4.DB.05 | Plattnerite | PbO2 |
| 4.DB.05 | Tripuhyite | Fe3+Sb5+O4 |
| 4.DB.05 | Tugarinovite | MoO2 |
| 4.DB.05 | Pyrolusite | Mn4+O2 |
| 4.DB.10 | Byströmite | MgSb2O6 |
| 4.DB.10 | Ordoñezite | ZnSb2O6 |
| 4.DB.10 | Tredouxite | NiSb2O6 |
| 4.DB.10 | Tapiolite-(Mn) | Mn2+Ta2O6 |
| 4.DB.10 | Tapiolite-(Fe) | Fe2+Ta2O6 |
| 4.DB.15a | Paramontroseite | V4+O2 |
| 4.DB.15a | Ramsdellite | Mn4+O2 |
| 4.DB.15b | Akhtenskite | ε-Mn4+O2 |
| 4.DB.15c | Nsutite | (Mn4+,Mn2+)(O,OH)2 |
| 4.DB.20 | Scrutinyite | α-PbO2 |
| 4.DB.20 | Nioboixiolite-([]) | (Nb0.8◻0.2)4+O2 |
| 4.DB.25 | Ishikawaite | U4+Fe2+Nb2O8 |
| 4.DB.25 | Yttrocolumbite-(Y) | Y(U4+,Fe2+)Nb2O8 |
| 4.DB.25 | Calciosamarskite | (Ca,U4+)Fe3+(Nb,Ta,Ti)2O8 |
| 4.DB.25 | Samarskite-(Yb) | YbFe3+(Nb,Ta)2O8 |
| 4.DB.25 | Ixiolite-(Sc) | (Ta0.5Sc0.5)O2 |
| 4.DB.25 | Ixiolite-(Fe2+) | (Ta0.67Fe2+0.33)O2 |
| 4.DB.25 | Ixiolite-(Mn2+) | (Ta0.67Mn2+0.33)O2 |
| 4.DB.25 | Srilankite | TiO2 |
| 4.DB.25 | Samarskite-(Y) | YFe3+Nb2O8 |
| 4.DB.25 | Nioboixiolite-(Fe3+) | (Nb0.5Fe3+0.5)O2 |
| 4.DB.30 va | Wolframite Group | |
| 4.DB.30 | Rossovskyite | (Fe3+,Ta)(Nb,Ti)O4 |
| 4.DB.30 | Huanzalaite | MgWO4 |
| 4.DB.30 | Heftetjernite | ScTaO4 |
| 4.DB.30 | Hübnerite | MnWO4 |
| 4.DB.30 | Sanmartinite | (Zn,Fe)WO4 |
| 4.DB.30 | Ferberite | FeWO4 |
| 4.DB.30 | 'Krasnoselskite' | CoWO4 |
| 4.DB.35 | Qitianlingite | (Fe,Mn)2(Nb,Ta)2WO10 |
| 4.DB.35 | Tantalaeschynite-(Ce) | Ce(TiTa)O6 |
| 4.DB.35 | Tantalite-(Mg) | (Mg,Fe2+)(Ta,Nb)2O6 |
| 4.DB.35 | Columbite-(Mn) | Mn2+Nb2O6 |
| 4.DB.35 | Tantalite-(Mn) | Mn2+Ta2O6 |
| 4.DB.35 | Columbite-(Fe) | Fe2+Nb2O6 |
| 4.DB.35 | Columbite-(Mg) | (Mg,Fe,Mn)(Nb,Ta)2O6 |
| 4.DB.35 | Tantalite-(Fe) | Fe2+Ta2O6 |
| 4.DB.40 | Ferrotitanowodginite | Fe2+TiTa2O8 |
| 4.DB.40 | 'Wolframowodginite' | Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8 |
| 4.DB.40 | Lithiotantite | LiTa3O8 |
| 4.DB.40 | Lithiowodginite | LiTa3O8 |
| 4.DB.40 | Titanowodginite | Mn2+TiTa2O8 |
| 4.DB.40 | Tantalowodginite | (Mn2+0.5◻0.5)TaTa2O8 |
| 4.DB.40 | Wodginite | Mn2+Sn4+Ta2O8 |
| 4.DB.40 | Ferrowodginite | Fe2+Sn4+Ta2O8 |
| 4.DB.45 | Tivanite | V3+TiO3(OH) |
| 4.DB.50 | Carmichaelite | (Ti,Cr,Fe)[O2-x(OH)x] |
| 4.DB.55 | Alumotantite | AlTaO4 |
| 4.DB.60 | Biehlite | ((Sb,As)O)2[MoO4] |
Fluorescence of Nioboixiolite-(Fe2+)
non-fluorescent
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 Nioboixiolite-(Fe2+)
mindat.org URL:
https://www.mindat.org/min-498782.html
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References for Nioboixiolite-(Fe2+)
Reference List:
Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 88. Mineralogical Magazine, 89. 1-11 doi:10.1180/mgm.2025.10183
[1]Zelek-Pogudz, Sylwia; Gołębiowska, Bożena; Rutkowski, Bogdan; Jeleń, Piotr; Nejbert, Krzysztof; Stadnicka, Katarzyna M.; Pieczka, Adam (2026) Nioboixiolite-(Fe2+), (Nb2/3Fe2+1/3)O2, a new mineral of the ixiolite group from Jordanów Śląski, Lower Silesia, Poland. Mineralogical Magazine, p.1-28. doi:10.1180/mgm.2026.10244
Localities for Nioboixiolite-(Fe2+)
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.
Poland (TL) | |
| Zelek-Pogudz et al. (2026) |
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