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Akdalaite

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Big Photo

Bulla Island (Bulli Island; Ostrov Bulla ; Khara-Zire), Caspian Sea, Qobustan (Gobustan; Kobustan) District, Azerbaijan
© 2008, JGW




Formula:
4Al
 
2
O
 
3
 · H
 
2
O
System:HexagonalColour:White, pale greenish ...
Lustre:VitreousHardness:7 - 7½
Name:For the Kazakh name, Akdala, for the type locality.
This page provides mineralogical data about Akdalaite.

Classification of Akdalaite

IMA status:Approved 1969
Strunz 8th edition ID:4/F.09-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:4.3.2.1

4 : SIMPLE OXIDES
3 : A2X3
Hey's CIM Ref.:7.6.8

7 : Oxides and Hydroxides
6 : Oxides of Al
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Type Occurrence of Akdalaite

Type Locality:Solnechnoye Mine (Solvech Mine), Kara-Oba W deposit, Betpakdala Desert (Bet-Pak-Dal Desert), Karagandy Province (Qaragandy Oblysy; Karaganda Oblast'), Kazakhstan
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:
VesuvianiteMuscoviteMagnetiteFluoriteDiopside
AndraditeAmesite

Physical Properties of Akdalaite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Comment:vitreous to porcelaneous
Colour:White, pale greenish yellow in thin section
Streak:White
Hardness (Mohs):7 - 7½
Tenacity:Brittle
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (measured):3.68 g/cm3
Density (calculated):3.673 g/cm3

Crystallography of Akdalaite

Crystal System:Hexagonal
Cell Parameters:a = 12.87Å, c = 14.97Å
Ratio:a:c = 1 : 1.163
Unit Cell Volume: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.
X-Ray Powder Diffraction:
d-spacingIntensity
0.9931 (9)
1.393 (10)
1.418 (10)
2.11 (10)
2.32 (8)
2.35 (9)
2.494 (9)
Comments:Material from type locality

Optical Data of Akdalaite

Type:Uniaxial (-)
RI values: nω = 1.747 nε = 1.741
Maximum Birefringence:δ = 0.006

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Akdalaite

Formula:
4Al
 
2
O
 
3
 · H
 
2
O
Essential elements:Al, H, O
All elements listed in formula:Al, H, O
Analytical Data:Empirical formula calculated from values corrected for fluorite and muscovite
SiO2 (4.74)
Al2O3 (87.26)
Fe2O3 (0.97)
ZnO (0.90)
BeO (0.81)
MgO (0.97)
CaO (0.41)
F (0.68)
H2O (4.23)

- O = (F,Cl)2 (0.28)

sum 100.69 wt.-%
Empirical Formula:
(Al
 
1.91
Be
 
0.04
Mg
 
0.03
Fe
3+
0.01
Zn
 
0.01
)
 
Σ=2.00
(O
 
2.91
H
 
0.07
F
 
0.02
)
 
Σ=3.00
 · 0.25H
 
2
O

Relationship of Akdalaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FL.05Woodallite
Mg
 
6
Cr
 
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Iowaite
Mg
 
6
Fe
3+
2
(OH)
 
16
Cl
 
2
 · 4H
 
2
O
4.FL.05Jamborite
(Ni
2+
 
,Ni
3+
 
,Co,Fe)(OH)
 
2
(OH,S,H
 
2
O)
4.FL.05Meixnerite
Mg
 
6
Al
 
2
(OH)
 
18
 · 4H
 
2
O
4.FL.05Muskoxite
Mg
 
7
Fe
 
4
O
 
13
 · 10H
 
2
O
4.FL.05Fougèrite
(Fe
2+
 
,Mg)
 
6
Fe
3+
2
(OH)
 
18
 · 4H
 
2
O
4.FL.10Hydrocalumite
Ca
 
2
Al(OH)
 
7
 · 2H
 
2
O
4.FL.15Kuzelite
Ca
 
4
Al
 
2.4
(OH)
 
12.8
(SO
 
4
) · 6H
 
2
O
4.FL.20Aurorite
(Mn
2+
 
,Ag,Ca)Mn
4+
3
O
 
7
 · 3H
 
2
O
4.FL.20Chalcophanite
(Zn,Fe,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Ernienickelite
NiMn
 
3
O
 
7
 · 3H
 
2
O
4.FL.20Jianshuiite
(Mg,Mn)Mn
 
3
O
 
7
 · 3H
 
2
O
4.FL.25Woodruffite
Zn(Mn
4+
 
,Mn
3+
 
)
 
5
O
 
10
·3½H
 
2
O
4.FL.30Asbolane
(Ni,Co)
 
2-x
Mn
4+
 
(O,OH)
 
4
 · nH
 
2
O
4.FL.35Buserite
Na
 
4
Mn
 
14
O
 
27
 · 21H
 
2
O
4.FL.40Ranciéite
(Ca,Mn)Mn
 
4
O
 
9
 · 3H
 
2
O
4.FL.40Takanelite
(Mn,Ca)Mn
 
4
O
 
9
 · H
 
2
O
4.FL.45Birnessite
(Na,Ca)
 
0.5
(Mn
4+
 
,Mn
3+
 
)
 
2
O
 
4
 · 1.5H
 
2
O
4.FL.55Cianciulliite
Mn(Mg,Mn)
 
2
Zn
 
2
(OH)
 
10
 · 2-4H
 
2
O
4.FL.60Jensenite
Cu
 
3
[TeO
 
6
] · 2H
 
2
O
4.FL.65Leisingite
Cu(Mg,Cu,Fe,Zn)
 
2
[TeO
 
6
] · 6H
 
2
O
4.FL.75Cafetite
(Ca,Mg)(Fe,Al)
 
2
Ti
 
4
O
 
12
 · 4H
 
2
O
4.FL.80Mourite
UMo
 
5
O
 
12
(OH)
 
10
4.FL.85Deloryite
Cu
 
4
(UO
 
2
)(MoO
 
4
)
 
2
(OH)
 
6
Related Minerals - Hey's Index Grouping:

- +
7.6.1Corundum
Al
 
2
O
 
3
7.6.2Böhmite
AlO(OH)
7.6.2Diaspore
AlO(OH)
7.6.4Gibbsite
Al(OH)
 
3
7.6.5Bayerite
Al(OH)
 
3
7.6.6Nordstrandite
Al(OH)
 
3
7.6.7Doyleite
Al(OH)
 
3

Other Names for Akdalaite

Synonyms:
IMA1969-002IMA2004-051Tohdite
Other Languages:
German:Akdalait
Russian:Акдалаит
Spanish:Akdalaita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Akdalaite

Reference List:

- +
Yamaguchi, G., Yanagida, H. and Shuitiro, O. (1964): New alumina hydrate, "tohdite" (5Al2O3·H2O). Bull. Chem. Soc. Japan 37, 752-754.

Shpanov, E. P., Sidorenko, G. A. and Stolyarova, T. I. (1970): Akdalaite, a new hydrous modification of alumina. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 99, 333-339 (in Russian). - American Mineralogist (1971), 56, 635 (abstract).

Anthony, J. W., Bideaux, R. A., Bladh, K. W. and Nichols, M. C. (1997): Handbook of Mineralogy, Vol. 3: Halides, Hydroxides, Oxides. Mineral Data Publishing (Tucson, AZ), 8.

Internet Links for Akdalaite

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    • Localities for Akdalaite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Australia
     
    • Queensland
      • Cook Shire
        • Cape York Peninsula
    Azerbaijan
     
    • Qobustan (Gobustan; Kobustan) District
      • Caspian Sea
    		Novgorodova M.I., MamedovYu.G. Lithology and Mineral Resources, 1996,N4, p.339-349
    Kazakhstan
     
    • Akmola Province (Aqmola Oblysy; Akmolinskaya Oblast')
    		=IMA2004-051, which was later withdrawn because it turned out to be = akdalaite.
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
      • Betpakdala Desert (Bet-Pak-Dal Desert)
        • Kara-Oba W deposit
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Russia
     
    • Far-Eastern Region
      • Kamchatka Oblast'
    		No reference listed
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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