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Akdalaite (IMA 2004-051)

Pictures (1 Images total)

Akdalait
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Akdalait
schmutzigweiße Massen von Akdalait, teilweise mit einschlüssen von ged. Aluminium in Glasampulle, Bulla Insel, Kaspisches Meer, Kobustan, Aserbaidschan; BB < 5 mm
Copyright: MinTreasure.com (Carsten Slotta); Contribution: openpit
Location: Aserbaidschan/Kobustan/Insel Bulla
Mineral: Akdalaite
Image: 1585485733
License: Usage for Mineralienatlas project only
Akdalait

schmutzigweiße Massen von Akdalait, teilweise mit einschlüssen von ged. Aluminium in Glasampulle, Bulla Insel, Kaspisches Meer, Kobustan, Aserbaidschan; BB < 5 mm

Copyright: MinTreasure.com (Carsten Slotta)
Contribution: openpit 2020-03-29
Locality: Insel Bulla / Kobustan / Aserbaidschan

Collectors Summary

Color weiß
Streak color weiß
Hardness (Mohs) 6.75
Crystal System hexagonal, P63mc

Chemism

Chemical formula

(Al2O3)5·H2O

Chemical composition

Aluminium, Sauerstoff, Wasserstoff

Unit weight: 527.822156 u; Number of atoms in the formula: 28

Info

Empirical formula:

(Al2O3)5·H2O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.38

2

7.14

1.0079470

2.0158940

Oxygen

O

48.50

16

57.14

15.9994300

255.9908800

Aluminium

Al

51.12

10

35.71

26.9815382

269.8153820

Analysis wt%

Al2O3 : 96.59, H2O : 4.23 (Ref: berechnet)

Strunz 9th edition incl. updates

4.FM.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
F: Hydroxide (ohne V oder U)
M: Hydroxide mit H2O ± (OH); unklassifiziert
05:Akdalait-Gruppe

Lapis Classification

IV/F.09-010

IV: OXIDE
F: Hydroxide und oxidische Hydrate (wasserhaltige Oxide mit Schichtstruktur)

Classification by Hölzel

4.FC.700

4: OXIDES
F: Hydroxides and Hydrates (without V and U)
C: Oxihydroxides
7: Akaganeite-Group

Dana 8th edition

04.03.02.01

04: Oxide Minerals
03: Simple Oxides with a cation charge of 3+ (A+++2 O3)

IMA status

anerkannt 1969 (2004 siehe Zusatzinformation)

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.006

Birefringence chart\! Akdalaite title=Birefringence chart Akdalaite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.747

RI value γ / ε

1.741

Ri mean

1.745

2V angle

Uniaxial (-)

Crystallography

Crystal System

hexagonal

Class (H-M)

6mm

Space Group number

186

Space Group

P63mc

Cell parameters a (Å)

5.58

Cell parameters b (Å)

-

Cell parameters c (Å)

8.86

Cell parameters a/b or c/a

1.588

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

1

Volume (ų)

238.909

X-Ray Powder Diffraction

3.24(70),
2.494(90),
2.35(90),
2.32(80),
2.11(100),
1.418(100),
1.393(100),
0.993(90)

XRD chart Akdalaite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.75

VHN (Hardness Vickers)

1085

Density (g/cm³)

3.68

3.668 ( ρ calc. Mineralienatlas )

Preface

Author (Name, Year)

Shpanov & Sidorenko & Stolyarova, 1970

Additional Information

Die IMA hat ds Mineral formal 2004 anerkannt (IMA2004-051). Einige Mitglieder drängten jedoch auf eine Nachprüfung des Minerals (IMA1969-002). Nach Prüfung stellte sich heraus, dass die früher ermittelten Zellparameter falsch waren und die Minerale identisch sind. Die Anerkennung des Minerals IMA2004-051 wird in Folge dessen annuliert.

References

Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 99 (1970), 333

Other languages

German

Akdalait

English

Akdalaite

French

Akdalaite

Spanish

Akdalaíta

Russian

Акдалаит

Alternative Name

Acdalait

Chudoba EIV, 1 (1974)

CNMNC (IMA)-Number

IMA 1969-002

IMA 2004-051

CNMNC symbol

Symbol

Akd

Locations with GPS information

IDs

GUSID (Global unique identifier short form) R7ZSFiD7LUOxME90fqR98g
GUID (Global unique identifier) 1652B647-FB20-432D-B130-4F747EA47DF2
Database ID 38