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Nioboixiolite-(Fe3+)

A valid IMA mineral species

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Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Nioboixiolite-(Fe3+)

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

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About Nioboixiolite-(Fe3+)Hide

Formula:

(Nb_0.5Fe³⁺_0.5)O₂

Colour:

black

Lustre:

Sub-Metallic

Hardness:

Specific Gravity:

5.033 (Calculated)

Crystal System:

Orthorhombic

Member of:

Ixiolite Group > Columbite Supergroup

Name:

For the ferric content of ixiolite

Type Locality:

ⓘ In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

This page provides mineralogical data about Nioboixiolite-(Fe3+).

Unique IdentifiersHide

Mindat ID:

471491

Long-form identifier:

mindat:1:1:471491:6

Similar NamesHide

Nioboixiolite-([])	A valid IMA mineral species	(Nb_0.8◻_0.2)⁴⁺O₂
Nioboixiolite-(Fe2+)	A valid IMA mineral species - pending publication	(Nb_0.67Fe²⁺_0.33)O₂
Nioboixiolite-(Mn2+)	A valid IMA mineral species - pending publication	(Nb_0.67Mn²⁺_0.33)O₂

IMA Classification of Nioboixiolite-(Fe3+)Hide

IMA status:

Approved

Approval year:

2024

Type description reference:

Chukanov, Nikita V.; Zubkova, Natalia V.; Pekov, Igor V.; Kasatkin, Anatoly V.; Agakhanov, Atali A.; Virus, Alla A.; Vigasina, Marina F.; Ternes, Bernd; Schüller, Willi; Britvin, Sergey N. (2025) Nioboixiolite-(Fe³⁺), (Nb_0.5Fe³⁺_0.5)O₂, a new ixiolite-group mineral from the Eifel palaeovolcanic region, Germany. Mineralogical Magazine, 89 (5). 602-608 doi:10.1180/mgm.2025.15

Classification of Nioboixiolite-(Fe3+)Hide

Strunz-mindat (2026):

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

Mineral SymbolsHide

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-Fe3+	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-(Fe3+)Hide

Lustre:

Sub-Metallic

Colour:

Black

Streak:

Black

Hardness:

5 on Mohs scale

Hardness:

VHN₅₀=499 kg/mm² - Vickers

Tenacity:

Brittle

Cleavage:

None Observed

Fracture:

Conchoidal

Density:

5.033 g/cm³ (Calculated)

Optical Data of Nioboixiolite-(Fe3+)Hide

Anisotropism:

Anisotropy is distinct, from light grey to grey

Bireflectance:

weak

Reflectivity:

Wavelength	R₁ (%)	R₂ (%)
470nm	14.7%	16.4%
546nm	14.3%	15.9%
589nm	14.1%	15.7%
650nm	14.0%	15.8%

Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 16.4%.
R₁ shown in black, R₂ shown in red

Colour in reflected light:

gray

Internal Reflections:

strong, bright-orange.

Pleochroism:

Non-pleochroic

Chemistry of Nioboixiolite-(Fe3+)Hide

Mindat Formula:

(Nb_0.5Fe³⁺_0.5)O₂

Element Weights:

Element	% weight
Nb	43.670 %
O	30.081 %
Fe	26.249 %

Calculated from ideal end-member formula.

Elements listed:

Fe, Nb, O - search for minerals with similar chemistry

Crystallography of Nioboixiolite-(Fe3+)Hide

Crystal System:

Orthorhombic

Class (H-M):

mmm(2/m2/m2/m) - Dipyramidal

Space Group:

Pbcn

Setting:

Pbcn

Cell Parameters:

a = 4.6578(6) Å, b = 5.6230(7) Å, c = 5.0182(5) Å

Ratio:

a:b:c = 0.828 : 1 : 0.892

Unit Cell V:

131.43 Å³ (Calculated from Unit Cell)

Twinning:

none observed

Epitaxial Relationships of Nioboixiolite-(Fe3+)Hide

Epitaxial Minerals:

'Ilmenite'	Fe²⁺TiO₃
'Ilmenite'	Fe²⁺TiO₃

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.586 Å	(29)
2.917 Å	(100)
2.503 Å	(18)
2.170 Å	(18)
2.056 Å	(15)
1.738 Å	(22)
1.689 Å	(26)
1.515 Å	(15)

Locality:

In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

Reference:

Type Occurrence of Nioboixiolite-(Fe3+)Hide

Type Locality:

ⓘ In den Dellen quarries, Mendig, Mendig, Mayen-Koblenz, Rhineland-Palatinate, Germany

General Appearance of Type Material:

long prismatic to acicular crystals up to 0.03 x 0.06 x 1 mm and epitaxial intergrowths with ilmenite and intermediate members of the samarskite–ekebergite series

Place of Conservation of Type Material:

Chukanov, N. V., Zubkova, N. V., Pekov, I. V., Kasatkin, A. V., Agakhanov, A. A., Ternes, B., Schüller, W., and Britvin, S. N.: Nioboixiolite-(Fe3+), IMA 2024-057, in: CNMNC Newsletter 82, Eur. J. Mineral., 36, https://doi.org/10.5194/ejm-36-1005-2024, 2024.

Geological Setting of Type Material:

nosean sanidinite

Associated Minerals at Type Locality:

Albite	Biotite	Columbite-(Fe)	Corundum	Ekebergite
Hercynite	Ilmenite	Nosean	Samarskite-(Y)	Sanidine
'Titanium-bearing Magnetite'

Reference:

Synonyms of Nioboixiolite-(Fe3+)Hide

IMA2024-057

Other Language Names for Nioboixiolite-(Fe3+)Hide

Dutch:Nioboixioliet-(Fe3+)

German:Nioboixiolit-(Fe3+)

Relationship of Nioboixiolite-(Fe3+) to other SpeciesHide

Member of:

Ixiolite Group > Columbite Supergroup

Other Members of Ixiolite Group:

Ixiolite-(Fe2+)	(Ta_0.67Fe²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
Ixiolite-(Mn2+)	(Ta_0.67Mn²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
Ixiolite-(Sc)	(Ta_0.5Sc_0.5)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
Nioboixiolite-(Fe2+)	(Nb_0.67Fe²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
Nioboixiolite-(Mn2+)	(Nb_0.67Mn²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
Nioboixiolite-([])	(Nb_0.8◻_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

Common AssociatesHide

Associations Based on Photo Data:

6 photos of Nioboixiolite-(Fe3+) associated with 'Sapphire'	Al₂O₃
4 photos of Nioboixiolite-(Fe3+) associated with Magnetite	Fe²⁺Fe³⁺₂O₄
3 photos of Nioboixiolite-(Fe3+) associated with Ilmenite	Fe²⁺TiO₃

Related Minerals - Strunz-mindat Grouping Hide

4.DB.	Tianhongqiite	CrTiO₃(OH)	Mon. 2/m : P2₁/c
4.DB.	Nioboheftetjernite	ScNbO₄	Mon. 2/m : P2₁/c
4.DB.	Huangshanite	Fe³⁺TaO₄	Mon. 2/m : P2/b
4.DB.	Nioboixiolite-(Mn2+)	(Nb_0.67Mn²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.	Sakhanaiskite	(Fe²⁺Ti)Nb₂O₈	Mon. 2/m : P2/b
4.DB.	Shakhdaraite-(Y)	ScYNb₂O₈	Mon. 2/m : P2/b
4.DB.05	Varlamoffite	Sn_1-xFe_xO_2-x(OH)
4.DB.05	Argutite	GeO₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.05	Cassiterite	SnO₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.05	Rutile	TiO₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.05	Plattnerite	PbO₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.05	Tripuhyite	Fe³⁺Sb⁵⁺O₄	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.05	Tugarinovite	MoO₂	Mon. 2/m : P2₁/c
4.DB.05	Pyrolusite	Mn⁴⁺O₂	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.10	Byströmite	MgSb₂O₆	Tet. 4/mmm(4/m2/m2/m) : P4/nmm
4.DB.10	Ordoñezite	ZnSb₂O₆	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.10	Tredouxite	NiSb₂O₆	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.10	Tapiolite-(Mn)	Mn²⁺Ta₂O₆	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.10	Tapiolite-(Fe)	Fe²⁺Ta₂O₆	Tet. 4/mmm(4/m2/m2/m) : P4₂/mnm
4.DB.15a	Paramontroseite	V⁴⁺O₂	Orth. mmm(2/m2/m2/m)
4.DB.15a	Ramsdellite	Mn⁴⁺O₂	Orth. mmm(2/m2/m2/m) : Pnma
4.DB.15b	Akhtenskite	ε-Mn⁴⁺O₂	Hex. 6/mmm(6/m2/m2/m) : P6₃/mmc
4.DB.15c	Nsutite	(Mn⁴⁺,Mn²⁺)(O,OH)₂	Hex.
4.DB.20	Scrutinyite	α-PbO₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.20	Nioboixiolite-([])	(Nb_0.8◻_0.2)⁴⁺O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Ishikawaite	U⁴⁺Fe²⁺Nb₂O₈	Mon.
4.DB.25	Yttrocolumbite-(Y)	Y(U⁴⁺,Fe²⁺)Nb₂O₈
4.DB.25	Calciosamarskite	(Ca,U⁴⁺)Fe³⁺(Nb,Ta,Ti)₂O₈	Orth. mmm(2/m2/m2/m)
4.DB.25	Samarskite-(Yb)	YbFe³⁺(Nb,Ta)₂O₈	Mon. 2/m : P2/b
4.DB.25	Ixiolite-(Sc)	(Ta_0.5Sc_0.5)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Ixiolite-(Fe2+)	(Ta_0.67Fe²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Ixiolite-(Mn2+)	(Ta_0.67Mn²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Nioboixiolite-(Fe2+)	(Nb_0.67Fe²⁺_0.33)O₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Srilankite	TiO₂	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.25	Samarskite-(Y)	YFe³⁺Nb₂O₈	Mon. 2/m : P2/b
4.DB.30 va	Wolframite Group
4.DB.30	Rossovskyite	(Fe³⁺,Ta)(Nb,Ti)O₄	Mon. 2/m : P2/b
4.DB.30	Huanzalaite	MgWO₄	Mon. 2/m : P2/b
4.DB.30	Heftetjernite	ScTaO₄	Mon. 2/m : P2/b
4.DB.30	Hübnerite	MnWO₄	Mon. 2/m : P2/b
4.DB.30	Sanmartinite	(Zn,Fe)WO₄	Mon. 2/m : P2₁/c
4.DB.30	Ferberite	FeWO₄	Mon. 2/m : P2/b
4.DB.30	'Krasnoselskite'	CoWO₄	Mon.
4.DB.35	Qitianlingite	(Fe,Mn)₂(Nb,Ta)₂WO₁₀	Orth. mmm(2/m2/m2/m)
4.DB.35	Tantalaeschynite-(Ce)	Ce(TiTa)O₆	Orth. mmm(2/m2/m2/m) : Pnma
4.DB.35	Tantalite-(Mg)	(Mg,Fe²⁺)(Ta,Nb)₂O₆	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.35	Columbite-(Mn)	Mn²⁺Nb₂O₆	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.35	Tantalite-(Mn)	Mn²⁺Ta₂O₆	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.35	Columbite-(Fe)	Fe²⁺Nb₂O₆	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.35	Columbite-(Mg)	(Mg,Fe,Mn)(Nb,Ta)₂O₆	Orth.
4.DB.35	Tantalite-(Fe)	Fe²⁺Ta₂O₆	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.40	Ferrotitanowodginite	Fe²⁺TiTa₂O₈	Mon. 2/m : B2/b
4.DB.40	'Wolframowodginite'	Mn(Mn,Sn,Fe,Ta)(W,Ta,Nb)₂O₈
4.DB.40	Lithiotantite	LiTa₃O₈	Mon. 2/m : P2₁/c
4.DB.40	Lithiowodginite	LiTa₃O₈	Mon. 2/m : B2/b
4.DB.40	Titanowodginite	Mn²⁺TiTa₂O₈	Mon. 2/m : B2/b
4.DB.40	Tantalowodginite	(Mn²⁺_0.5◻_0.5)TaTa₂O₈	Mon. 2/m : B2/b
4.DB.40	Wodginite	Mn²⁺Sn⁴⁺Ta₂O₈	Mon. 2/m : B2/b
4.DB.40	Ferrowodginite	Fe²⁺Sn⁴⁺Ta₂O₈	Mon. 2/m : B2/b
4.DB.45	Tivanite	V³⁺TiO₃(OH)	Mon. 2/m : P2₁/c
4.DB.50	Carmichaelite	(Ti,Cr,Fe)[O_2-x(OH)_x]	Mon. 2/m : P2₁/c
4.DB.55	Alumotantite	AlTaO₄	Orth. mmm(2/m2/m2/m) : Pbcn
4.DB.60	Biehlite	((Sb,As)O)₂[MoO₄]	Mon. 2/m : B2/b

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.

Internet Links for Nioboixiolite-(Fe3+)Hide

mindat.org URL:

https://www.mindat.org/min-471491.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Mineral Dealers:

Buy from D. Joyce minerals

References for Nioboixiolite-(Fe3+)Hide

Reference List:

Chukanov, N. V., Zubkova, N. V., Pekov, I. V., Kasatkin, A. V., Agakhanov, A. A., Ternes, B., Schüller, W., Britvin, S. N. (2024) Nioboixiolite-(Fe3+), IMA 2024-057, in IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 82. European Journal of Mineralogy, 36 (6). 1005-1010 doi:10.5194/ejm-36-1005-2024

Localities for Nioboixiolite-(Fe3+)Hide

Showing 1 localities.

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.

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Locality ListHide

- 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). ~~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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Germany (TL)

Rhineland-Palatinate

Mayen-Koblenz

Mendig

Mendig

ⓘ In den Dellen quarries (TL)

Chukanov et al. (2024)

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Nioboixiolite-(Fe3+)

About Nioboixiolite-(Fe3+)Hide

Unique IdentifiersHide

Similar NamesHide

IMA Classification of Nioboixiolite-(Fe3+)Hide

Classification of Nioboixiolite-(Fe3+)Hide

Mineral SymbolsHide

Physical Properties of Nioboixiolite-(Fe3+)Hide

Optical Data of Nioboixiolite-(Fe3+)Hide

Chemistry of Nioboixiolite-(Fe3+)Hide

Crystallography of Nioboixiolite-(Fe3+)Hide

Epitaxial Relationships of Nioboixiolite-(Fe3+)Hide

X-Ray Powder DiffractionHide

Type Occurrence of Nioboixiolite-(Fe3+)Hide

Synonyms of Nioboixiolite-(Fe3+)Hide

Other Language Names for Nioboixiolite-(Fe3+)Hide

Relationship of Nioboixiolite-(Fe3+) to other SpeciesHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for Nioboixiolite-(Fe3+)Hide

References for Nioboixiolite-(Fe3+)Hide

Localities for Nioboixiolite-(Fe3+)Hide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide