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Akdalaite

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Bulla Island (Bulli Island; Bulla Ostrov; 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, Kara-Oba W deposit, Betpakdala Desert (Bet-Pak-Dal Desert), Qaraghandy 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
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
X-Ray Powder Diffraction:
d-spacingIntensity
0.9931 (9)
1.393 (10)
1.418 (10)
2.11 (10)
2.32 (8)
2.35 (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
 
4
Fe(OH)
 
8
OCl·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

    Hide Locality List
    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.
    (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
      • 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
     
    • Kökshetaü Oblysy (Kokshatau [Kokchetav] Oblast')
      • Kokchetav Massif
    		=IMA2004-051, which was later withdrawn because it turned out to be = akdalaite.
    • Qaraghandy 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
    Google
     
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