Akdalaite Mineral Data

(Translated by https://www.hiragana.jp/)
Akdalaite Mineral Data

General Akdalaite Information

Chemical Formula:

5(Al2O3)•(H2O)

Composition:

Molecular Weight = 527.82 gm

Aluminum 51.12 % Al 96.59 % Al₂O₃

Hydrogen 0.38 % H 3.41 % H₂O

Oxygen 48.50 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

(Al₂O₃)₅•(H₂O)

Environment:

In a skarn.

IMA Status:

Approved IMA 1970

Locality:

Solvech fluorite deposit, Karaganda region, Kazakhstan, Akdala. Link to MinDat.org Location Data.

Name Origin:

Named for the Kazakh name for the locality.

Name Pronunciation:

Akdalaite + Pronunciation

Synonym:

IMA1969-002

IMA2004-051 - IMA1969-002 (Akdalaite) has priority

Akdalaite Image

Images:

Akdalaite

Comments: Crystalline white akdalaite.
Location: Bulla Island, Caspian Sea, Kazakhstan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Akdalaite Crystallography

Axial Ratios:

a:c = 1:1.58781

Cell Dimensions:

a = 5.58, c = 8.86, Z = 1; V = 238.91 Den(Calc)= 3.67

Crystal System:

Hexagonal - Dihexagonal PyramidalH-M Symbol (6mm) Space Group: P 6₃mc

Crystal Structure:

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Demichelis R , Noel Y , Zicovich-Wilson C M , Roetti C , Valenzano L , Dovesi R , Journal of Physics: Conference Series , 117 (2008) p.012013-012013, Ab-initio quantum mechanical study of akdalaite (5Al2O3·H2O):, Structure and vibrational spectrum,, Locality: Theoretical structure

Physical Properties of Akdalaite

Cleavage:

None

Color:

White.

Density:

3.68

Diaphaneity:

Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Akdalaite

Gladstone-Dale:

CI meas= 0.044 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2027,KPDmeas= 0.2022,KC= 0.2115
Ncalc = 1.78

Optical Data:

Uniaxial (-), e=1.741, w=1.747, bire=0.0060.

Calculated Properties of Akdalaite

Electron Density:

Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Akdalaite =3.67 gm/cc.

Fermion Index:

Fermion Index = 0.0002333701
Boson Index = 0.9997666299

Photoelectric:

PE_Akdalaite= 1.50 barns/electron
U=PE_Akdalaite x rElectron Density= 5.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Akdalaite is Not Radioactive

Akdalaite Classification

Dana Class:

04.03.02.01 (04)Simple Oxides

(04.03)with a cation charge of 3+ (A+++2 O3)

(04.03.02)Dana Group

04.03.02.01 Akdalaite 5(Al2O3)•(H2O) P 6₃mc 6mm

04.03.02.02 Ferrihydrite Fe2O3•0.5(H2O) P 31c 3 2/m

Strunz Class:

04.FL.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FL -Hydroxides with H2O ± (OH); sheets of edge-sharing octahedra

04.FL.05 Akdalaite 5(Al2O3)•(H2O) P 6₃mc 6mm

04.FL.05 Meixnerite Mg6Al2(OH)18•4(H2O) R 3m 3 2/m

04.FL.05 Jamborite (Ni,Ni,Fe)(OH)2(OH,S,(H2O)) Unk Hex

04.FL.05 Iowaite Mg4Fe(OH)8OCl•2-4(H2O) R 3m 3 2/m

04.FL.05 Muskoxite Mg7Fe4O13•10(H2O) Unk (pseudo HEX-R) Trig

04.FL.05 Woodallite! Mg6Cr2(OH)16Cl2•4(H2O) R 3m 3 2/m

Other Akdalaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Akdalaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Ask about Akdalaite here :
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Print or Cut-and-Paste your Akdalaite Specimen Label here :

Akdalaite

5(Al2O3)•(H2O)
Dana No: 04.03.02.01 Strunz No: 04.FL.05
Locality:

Notes: