Deltalumite
A valid IMA mineral species
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Formula:
(Al0.67◻0.33)Al2O4
Colour:
Pale yellowish, pale beige or white
Lustre:
Vitreous
Specific Gravity:
3.663 (Calculated)
Crystal System:
Tetragonal
Member of:
Name:
The name derives from delta-alumina (δ-Al2O3), the name of the synthetic phase.
Type Locality:
Paglia (2004) reports the following calcination pathway: gibbsite → böhmite → γ-Al2O3 (Unnamed (gamma-alumina)) → δ-Al2O3 (synthetic equivalent of deltalumite) → θ-Al2O3 (synthetic equivalent of UM1990-23-O:Al) → α-Al2O3 (corundum).
Analogue of the spinel-type synthetic δ-Al2O3.
Analogue of the spinel-type synthetic δ-Al2O3.
Unique Identifiers
Mindat ID:
47933
Long-form identifier:
mindat:1:1:47933:0
IMA Classification of Deltalumite
Approved
IMA Formula:
(Al0.67◻0.33)Al2O4
Approval year:
2016
First published:
2019
Type description reference:
Pekov, I.V.; Anikin, L.P.; Chukanov, N.V.; Belakovskiy, D.I.; Yapaskurt, V.O.; Sidorov, E.G.; Britvin, S.N.; Zubkova, N.V. (2019) Deltalumite, a new natural modification of alumina with spinel-type structure. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 148 (5). p.45-58. doi:10.30695/zrmo/2019.1485.02
Classification of Deltalumite
4.BB.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations
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 |
|---|---|---|
| Dal | 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 Deltalumite
Vitreous
Transparency:
Translucent
Colour:
Pale yellowish, pale beige or white
Tenacity:
Brittle
Density:
3.663 g/cm3 (Calculated)
Optical Data of Deltalumite
Type:
Uniaxial (-)
RI values:
nω = 1.65(2) nε = 1.65(2)
Max. Birefringence:
δ = 0.000
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:
Moderate
Chemistry of Deltalumite
Mindat Formula:
(Al0.67◻0.33)Al2O4
Elements listed:
Crystallography of Deltalumite
Crystal System:
Tetragonal
Class (H-M):
42m - Scalenohedral
Space Group:
P4m2
Setting:
P4m2
Cell Parameters:
a = 5.608(1) Å, c = 23.513(7) Å
Ratio:
a:c = 1 : 4.193
Unit Cell V:
739.4 ų
Z:
16
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.728 Å | (61) |
| 2.424 Å | (51) |
| 2.408 Å | (49) |
| 2.281 Å | (42) |
| 1.993 Å | (81) |
| 1.954 Å | (48) |
| 1.948 Å | (32) |
| 1.396 Å | (100) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Deltalumite
General Appearance of Type Material:
Roundish aggregations up to 0.2 mm across which consist of blocky, coarse prismatic individuals up to 0.03 mm in size.
Place of Conservation of Type Material:
Collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (registration number 4767/1)
Geological Setting of Type Material:
Pores of basalt lava and basalt scoria altered by fumarolic gas.
Reference:
Pekov, I.V.; Anikin, L.P.; Chukanov, N.V.; Belakovskiy, D.I.; Yapaskurt, V.O.; Sidorov, E.G.; Britvin, S.N.; Zubkova, N.V. (2019) Deltalumite, a new natural modification of alumina with spinel-type structure. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 148 (5). p.45-58. doi:10.30695/zrmo/2019.1485.02
Synonyms of Deltalumite
Other Language Names for Deltalumite
Dutch:Deltalumiet
German:Deltalumit
Relationship of Deltalumite to other Species
Member of:
Other Members of Spinel Subgroup:
| Chihmingite | NiAl2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Chromite | Fe2+Cr3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Cochromite | CoCr2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Coulsonite | Fe2+V3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Cuprospinel | Cu2+Fe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Dellagiustaite | V2+Al2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Franklinite | Zn2+Fe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Gahnite | ZnAl2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Galaxite | Mn2+Al2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Guite | Co2+Co3+2O4 | Iso. |
| Hausmannite | Mn2+Mn3+2O4 | Tet. 4/mmm(4/m2/m2/m) : I41/amd |
| Hercynite | Fe2+Al2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Hetaerolite | ZnMn2O4 | Tet. 4/mmm(4/m2/m2/m) : I41/amd |
| Jacobsite | Mn2+Fe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| 'Jacobsite-Q' | Mn2+(Fe3+,Mn3+)2O4 | Tet. 4/mmm(4/m2/m2/m) : I41/amd |
| Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 | Iso. 432 : P4132 |
| Magnesiochromite | MgCr2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Magnesiocoulsonite | MgV2O4 | Iso. m3m(4/m32/m) |
| Magnesioferrite | MgFe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Magnetite | Fe2+Fe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Manganochromite | Mn2+Cr2O4 | Iso. m3m(4/m32/m) : Fd3m |
| 'Nichromite' | (Ni,Co,Fe)(Cr,Fe,Al)2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Spinel | MgAl2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Thermaerogenite | CuAl2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 | Iso. 432 : P4332 |
| Trevorite | Ni2+Fe3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| 'UM1994-06-O:AlCo' | CoAl2O4 | |
| Vuorelainenite | Mn2+V3+2O4 | Iso. m3m(4/m32/m) : Fd3m |
| Zincochromite | ZnCr2O4 | Iso. m3m(4/m32/m) : Fd3m |
Related Minerals - Strunz-mindat Grouping
| 4.BB. | Chenmingite | FeCr2O4 |
| 4.BB. | Thermaerogenite | CuAl2O4 |
| 4.BB. | Chukochenite | LiAl5O8 |
| 4.BB. | Elgoresyite | (Mg5Si2)O9 |
| 4.BB. | Jianmuite | ZrTi4+Ti3+5Al3O16 |
| 4.BB. | Dellagiustaite | V2+Al2O4 |
| 4.BB. | Garpenbergite | Mn6◻AsSbO10(OH)2 |
| 4.BB. | Magnéliite | Ti3+2Ti4+2O7 |
| 4.BB.05 | Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 |
| 4.BB.05 | Chromite | Fe2+Cr3+2O4 |
| 4.BB.05 | Filipstadite | (Fe3+0.5Sb5+0.5)Mn2O4 |
| 4.BB.05 | Jacobsite | Mn2+Fe3+2O4 |
| 4.BB.05 | Wernerkrauseite | Ca(Fe3+,Mn3+)2Mn4+O6 |
| 4.BB.05 | Harmunite | CaFe2O4 |
| 4.BB.05 | Zincochromite | ZnCr2O4 |
| 4.BB.05 | Franklinite | Zn2+Fe3+2O4 |
| 4.BB.05 | Cochromite | CoCr2O4 |
| 4.BB.05 | 'Nichromite' | (Ni,Co,Fe)(Cr,Fe,Al)2O4 |
| 4.BB.05 | Hercynite | Fe2+Al2O4 |
| 4.BB.05 | Gahnite | ZnAl2O4 |
| 4.BB.05 | Galaxite | Mn2+Al2O4 |
| 4.BB.05 | Guite | Co2+Co3+2O4 |
| 4.BB.05 | Coulsonite | Fe2+V3+2O4 |
| 4.BB.05 | Vuorelainenite | Mn2+V3+2O4 |
| 4.BB.05 | Spinel | MgAl2O4 |
| 4.BB.05 | Cuprospinel | Cu2+Fe3+2O4 |
| 4.BB.05 | Manganochromite | Mn2+Cr2O4 |
| 4.BB.05 | Magnesiocoulsonite | MgV2O4 |
| 4.BB.05 | Trevorite | Ni2+Fe3+2O4 |
| 4.BB.05 | Magnesiochromite | MgCr2O4 |
| 4.BB.05 | Magnesioferrite | MgFe3+2O4 |
| 4.BB.05 | Magnetite | Fe2+Fe3+2O4 |
| 4.BB.05 | Ulvöspinel | TiFe2+2O4 |
| 4.BB.10 | Hausmannite | Mn2+Mn3+2O4 |
| 4.BB.10 | Hetaerolite | ZnMn2O4 |
| 4.BB.10 | Manganostibite | (Mn,Fe)7SbAsO12 |
| 4.BB.15 | Titanomaghemite | (Ti4+0.5◻0.5)Fe3+2O4 |
| 4.BB.15 | Maghemite | (Fe3+0.67◻0.33)Fe3+2O4 |
| 4.BB.20 | Tegengrenite | (Mn3+0.5Sb5+0.5)Mg2O4 |
| 4.BB.25 | Xieite | Fe2+Cr2O4 |
| 4.BB.30 | Carmeltazite | ZrAl2Ti4O11 |
| 4.BB.35 | Feiite | Fe2+2(Fe2+Ti4+)O5 |
| 4.BB.40 | Maohokite | MgFe2O4 |
| 4.BB.45 | Tschaunerite | (Fe2+)(Fe2+Ti4+)O4 |
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 Deltalumite
mindat.org URL:
https://www.mindat.org/min-47933.html
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References for Deltalumite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter 32. Mineralogical Magazine, 80 (5) 915-922 doi:10.1180/minmag.2016.080.084
Bosi, Ferdinando, Biagioni, Cristian, Pasero, Marco (2019) Nomenclature and classification of the spinel supergroup. European Journal of Mineralogy, 31 (1) 183-192 doi:10.1127/ejm/2019/0031-2788
Pekov, I.V.; Anikin, L.P.; Chukanov, N.V.; Belakovskiy, D.I.; Yapaskurt, V.O.; Sidorov, E.G.; Britvin, S.N.; Zubkova, N.V. (2019) Deltalumite, a new natural modification of alumina with spinel-type structure. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 148 (5). p.45-58. doi:10.30695/zrmo/2019.1485.02
Pekov, I.V.; Anikin, L.P.; Chukanov, N.V.; Belakovskiy, D.I.; Yapaskurt, V.O.; Sidorov, E.G.; Britvin, S.N.; Zubkova, N.V. (2019) Deltalumite, a new natural modification of alumina with spinel-type structure. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 148 (5). p.45-58. doi:10.30695/zrmo/2019.1485.02
Localities for Deltalumite
Showing 3 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.
Israel | |
| Griffin et al. (2020) |
Russia (TL) | |
| Hålenius et al. (2016) +1 other reference |
| Аникин et al. (2018) |
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