Tredouxite
A valid IMA mineral species
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About Tredouxite
Marian Tredoux
Formula:
NiSb2O6
Colour:
Light gray
Lustre:
Sub-Metallic
Hardness:
3
Crystal System:
Tetragonal
Member of:
Name:
Named in honour of Marian Tredoux (20 September 1952 - 19 January 2019), professor in the Department of Geology, University of the Free State, Bloemfontein, South Africa for her work on the type locality - the Bon Accord nickel oxide deposit in the Barberton greenstone belt.
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
52170
Long-form identifier:
mindat:1:1:52170:3
IMA Classification of Tredouxite
Approved
IMA Formula:
Ni2+Sb5+2O6
Approval year:
2017
First published:
2017
Classification of Tredouxite
4.DB.10
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 |
|---|---|---|
| Tdx | 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 Tredouxite
Sub-Metallic
Colour:
Light gray
Comment:
In polished sections
Streak:
Gray
Hardness:
3 on Mohs scale
Hardness:
VHN10=218 - 240 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Optical Data of Tredouxite
Anisotropism:
Very weak
Bireflectance:
Weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 471nm | 15.6% | 15.8% |
| 548nm | 14.6% | 14.4% |
| 586nm | 14.5% | 14.3% |
| 652nm | 14.6% | 14.4% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 15.8%.
R1 shown in black, R2 shown in red
Internal Reflections:
Weak red-brown
Pleochroism:
Non-pleochroic
Chemistry of Tredouxite
Mindat Formula:
NiSb2O6
Element Weights:
Elements listed:
Crystallography of Tredouxite
Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mnm
Setting:
P42/mnm
Cell Parameters:
a = 4.6324(5) Å, c = 9.2154(8) Å
Ratio:
a:c = 1 : 1.989
Unit Cell V:
197.91 ų
Z:
2
Morphology:
Subhedral to anhedral grains
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.14 Å | (10) |
| 3.28 Å | (100) |
| 2.561 Å | (65) |
| 2.316 Å | (20) |
| 1.716 Å | (60) |
| 1.639 Å | (10) |
| 1.467 Å | (10) |
| 1.379 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Tredouxite
General Appearance of Type Material:
Subhedral to anhedral grains from 10 to 500μm
Place of Conservation of Type Material:
Mineralogical collections of the Museo di Storia Naturale, University of Florence, Florence, Italy, catalogue number 3281/I
Associated Minerals at Type Locality:
Synonyms of Tredouxite
Other Language Names for Tredouxite
Dutch:Tredouxiet
German:Tredouxit
Relationship of Tredouxite to other Species
Member of:
Other Members of Byströmite Group:
| Byströmite | MgSb2O6 | Tet. 4/mmm(4/m2/m2/m) : P4/nmm |
| Ordoñezite | ZnSb2O6 | Tet. 4/mmm(4/m2/m2/m) : P42/mnm |
Common Associates
Associations Based on Photo Data:
| 3 photos of Tredouxite associated with Trevorite | Ni2+Fe3+2O4 |
| 2 photos of Tredouxite associated with Willemseite | Ni3Si4O10(OH)2 |
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 | 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 | Nioboixiolite-(Fe2+) | (Nb0.67Fe2+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] |
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 Tredouxite
mindat.org URL:
https://www.mindat.org/min-52170.html
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References for Tredouxite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 39. Mineralogical Magazine, 81 (5) 1279-1286 doi:10.1180/minmag.2017.081.072
Localities for Tredouxite
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.
South Africa (TL) | |
| Hålenius et al. (2017) +1 other reference |
Quick NavTopAbout TredouxiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Bon Accord Ni deposit, Barberton, Mbombela Local Municipality, Ehlanzeni District Municipality, Mpumalanga, South Africa