Akdalaite
A valid IMA mineral species
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About Akdalaite
Formula:
Al10O14(OH)2
Formerly given as 5Al2O3.H2O.
Colour:
White, pale greenish yellow in thin section
Lustre:
Vitreous
Hardness:
7 - 7½
Specific Gravity:
3.68
Crystal System:
Hexagonal
Member of:
Name:
For the Kazakh name, Akdala, for the type locality.
Isostructural with:
In the structure there are oxygen planes with ABACA sequence (Yamaguchi et al., 1964). In the ab initio model proposed by Demichelis et al. (2008) there are 8 Al atoms located in the octahedral cavities and 2 Al atoms in the tetrahedral ones; two types of irregular AlO6 edge-sharing octahedra; AlO4 vertices-sharing tetrahedra. There are 2 sheets of first-type (a) octahedra, and two sheets with second-type (b) octahedra and tetrahedra (c).
Recently (2019) proved to be the Al analogue of ferrihydrite.
Recently (2019) proved to be the Al analogue of ferrihydrite.
Unique Identifiers
Mindat ID:
69
Long-form identifier:
mindat:1:1:69:3
IMA Classification of Akdalaite
Approved
Approval year:
1969
Classification of Akdalaite
4.FL.70
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
4.3.2.1
4 : SIMPLE OXIDES
3 : A2X3
4 : SIMPLE OXIDES
3 : A2X3
7.6.8
7 : Oxides and Hydroxides
6 : Oxides of Al
7 : Oxides and Hydroxides
6 : Oxides of Al
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 |
|---|---|---|
| Akd | 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 Akdalaite
Vitreous
Transparency:
Translucent
Comment:
vitreous to porcelaneous
Colour:
White, pale greenish yellow in thin section
Streak:
White
Hardness:
7 - 7½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.68 g/cm3 (Measured) 3.673 g/cm3 (Calculated)
Optical Data of Akdalaite
Type:
Uniaxial (-)
RI values:
nω = 1.747 nε = 1.741
Max. Birefringence:
δ = 0.006
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.
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.
Surface Relief:
Moderate
Chemistry of Akdalaite
Mindat Formula:
Al10O14(OH)2
Formerly given as 5Al2O3.H2O.
Formerly given as 5Al2O3.H2O.
Elements listed:
Crystallography of Akdalaite
Crystal System:
Hexagonal
Cell Parameters:
a = 12.87 Å, c = 14.97 Å
Ratio:
a:c = 1 : 1.163
Unit Cell V:
2,147.38 ų (Calculated from Unit Cell)
Z:
18
Morphology:
As hexagonal crystals, to 0.8 mm, tabular to equant; in lenslike aggregates.
Comment:
Possible space groups: P6122, P61
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0013285 | Akdalaite | Demichelis R, Noel Y, Zicovich-Wilson C M, Roetti C, Valenzano L, Dovesi R (2008) Ab-initio quantum mechanical study of akdalaite (5Al2O3*H2O): Structure and vibrational spectrum, Journal of Physics: Conference Series 117 012013-012013 | 2008 | Theoretical structure | 0 | 293 | |
| 0013284 | Akdalaite | Demichelis R, Noel Y, Zicovich-Wilson C M, Roetti C, Valenzano L, Dovesi R (2008) Ab-initio quantum mechanical study of akdalaite (5Al2O3*H2O): Structure and vibrational spectrum, Journal of Physics: Conference Series 117 012013-012013 | 2008 | Theoretical structure | 0 | 293 | |
| 0013283 | Akdalaite | Demichelis R, Noel Y, Zicovich-Wilson C M, Roetti C, Valenzano L, Dovesi R (2008) Ab-initio quantum mechanical study of akdalaite (5Al2O3*H2O): Structure and vibrational spectrum, Journal of Physics: Conference Series 117 012013-012013 | 2008 | Theoretical structure | 0 | 293 | |
| 0012146 | Akdalaite | Yamaguchi G, Okumiya M, Ono S (1969) Refinement of the structure of tohdite 5Al2O3*H2O Bulletin of the Chemical Society of Japan 42 2247-2249 | 1969 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 0.9931 Å | (9) |
| 1.393 Å | (10) |
| 1.418 Å | (10) |
| 2.11 Å | (10) |
| 2.32 Å | (8) |
| 2.35 Å | (9) |
| 2.494 Å | (9) |
Comments:
Material from type locality
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Akdalaite
General Appearance of Type Material:
lenslike aggregates and tabular to equant hexagonal crystals to 0.1 mm
Place of Conservation of Type Material:
A. E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
veinlets cutting amesite-fluorite-muscovite rock and fluorite-magnetite-diopside-vesuvianite skarn
Associated Minerals at Type Locality:
Synonyms of Akdalaite
Other Language Names for Akdalaite
Relationship of Akdalaite to other Species
Member of:
Other Members of Nolanite Group:
| Ferrihydrite | Fe3+10O14(OH)2 | Trig. |
| Nolanite | V3+8Fe3+2O14(OH)2 | Hex. 6mm : P63mc |
Common Associates
Associations Based on Photo Data:
| 2 photos of Akdalaite associated with Native Aluminium | Al |
| 1 photo of Akdalaite associated with Magnetite | Fe2+Fe3+2O4 |
Related Minerals - Strunz-mindat Grouping
| 4.FL. | Trébeurdenite | Fe2+2Fe3+4O2(OH)10CO3 · 3H2O |
| 4.FL. | Mariakrite | [Ca4Al2(OH)12(H2O)4][Fe2S4] |
| 4.FL.05 | Muskoxite | Mg7Fe4O13 · 10H2O |
| 4.FL.05 | Jamborite | Ni2+1-xCo3+x(OH)2-x(SO4)x · nH2O |
| 4.FL.05 | Mössbauerite | Fe3+6O4(OH)8[CO3] · 3H2O |
| 4.FL.05 | Meixnerite | Mg6Al2(OH)16(OH)2 · 4H2O |
| 4.FL.05 | Woodallite | Mg6Cr2(OH)16Cl2 · 4H2O |
| 4.FL.05 | Fougèrite | Fe2+4Fe3+2(OH)12[CO3] · 3H2O |
| 4.FL.05 | Dritsite | Li2Al4(OH)12Cl2 · 3H2O |
| 4.FL.05 | Rotemite | Ca4Cr2(OH)12Cl2 · 4H2O |
| 4.FL.05 | Iowaite | Mg6Fe3+2(OH)16Cl2 · 4H2O |
| 4.FL.10 | Hydrocalumite | Ca4Al2(OH)12(Cl,CO3,OH)2 · 4H2O |
| 4.FL.15 | Kuzelite | Ca4Al2(OH)12[SO4] · 6H2O |
| 4.FL.20 | Jianshuiite | (Mg,Mn,Ca)Mn3O7 · 3H2O |
| 4.FL.20 | Ernienickelite | NiMn3O7 · 3H2O |
| 4.FL.20 | Aurorite | Mn2+Mn4+3O7 · 3H2O |
| 4.FL.20 | Chalcophanite | ZnMn4+3O7 · 3H2O |
| 4.FL.25 | Woodruffite | Zn2+x/2(Mn4+1-xMn3+x)O2 · yH2O |
| 4.FL.30 | Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| 4.FL.30 va | 'Lampadite' | Cu, Mn, O, H |
| 4.FL.35 | 'Buserite' | Na4Mn14O27 · 21H2O |
| 4.FL.40 | Takanelite | (Mn,Ca)Mn4O9 · H2O |
| 4.FL.40 | Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
| 4.FL.45 | Birnessite | (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O |
| 4.FL.55 | Cianciulliite | Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O |
| 4.FL.60 | Jensenite | Cu3[TeO6] · 2H2O |
| 4.FL.65 | Leisingite | Cu2MgTe6+O6 · 6H2O |
| 4.FL.70 | Magnesiohongruiite-(Fe3+) | (Mg2Fe3+)Fe3+NbO7(OH) |
| 4.FL.75 | Cafetite | CaTi2O5 · H2O |
| 4.FL.80 | Mourite | UMo5O12(OH)10 |
| 4.FL.85 | Deloryite | Cu4(UO2)(MoO4)2(OH)6 |
| 4.FL.90 | Lagalyite | Ca2xMn1-xO2 · 1.5-2H2O |
| 4.FL.95 | 'Tunnerite (of Cornu)' | |
| 4.FL.100 | Carbocalumite | Ca4Al2(OH)12(CO3) · 6H2O |
| 4.FL.100 | Mampsisite | Ca4Al2(CO3)(OH)12 · 5H2O |
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 Akdalaite
mindat.org URL:
https://www.mindat.org/min-69.html
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References for Akdalaite
Localities for Akdalaite
Showing 8 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.
Australia | |
| Tilley (1996) |
Azerbaijan | |
| Novgorodova M.I. |
Brazil | |
| Specimen from Gunnar Färber |
China | |
| Hu et al. (2007) |
Kazakhstan | |
| Hwang et al. (2006) |
| Shpanov et al. (1970) +2 other references |
South Africa | |
| Zhou et al. (2003) |
USA | |
| Hwang et al. (2015) |
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Bulla Island, Baku City, Azerbaijan