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Akimotoite (Akimotoit)

Collectors Summary

Color farblos
Crystal System trigonal, R3

Chemism

Chemical formula

(Mg,Fe2+)SiO3

Chemical composition

Eisen, Magnesium, Silicium, Sauerstoff

Unit weight: 108.273915 u; Number of atoms in the formula: 5

Info

Empirical formula:

(Mg0.75Fe0.25)SiO3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

44.33

3

60.00

15.9994300

47.9982900
Magnesium

Mg

16.84

0.75

15.00

24.3050600

18.2287950
Silicon

Si

25.94

1

20.00

28.0855300

28.0855300
Iron

Fe

12.89

0.25

5.00

55.8452000

13.9613000

Analysis wt%

SiO2 : 56.35, MgO : 28.39, FeO : 13.54, Na2O : 0.67 (Ref: American Mineralogist 99)

Strunz 9th edition incl. updates

4.CB.05

4: Oxide, Hydroxide (Oxide, Hydroxide, V[5,6]-Vanadate, Arsenite, Antimonite, Bismutite, Sulfite, Selenite, Tellurite, Iodate)
C: Metall: Sauerstoff = 2: 3,3: 5, und vergleichbare
B: Mit mittelgroßen Kationen
05:Korund-Gruppe

Lapis Classification

VIII/F.02-035

VIII: SILIKATE
F: Ketten- und Bandsilikate
2: Zweierketten [Si2O6] 4-; Pyroxen-Gruppe; Orthopyroxene

Classification by Hölzel

4.CD.200

4: OXIDES
C: R2O3 Sesquioxides
D: Ilmenite-Group

Dana 8th edition

04.03.05.07

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

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Ilmenite group

Optical Properties

Color

farblos

Diaphaneity (Transparency)

transparent

Crystallography

Crystal System

trigonal

Class (H-M)

3

Space Group number

148

Space Group

R3

Cell parameters a (Å)

4.78

Cell parameters b (Å)

-

Cell parameters c (Å)

13.6

Cell parameters a/b or c/a

2.845

Cell parameters c/b

-

Z

6

Volumne (ų)

269.107

X-Ray Powder Diffraction

3.509(60),
2.616(100),
2.366(50),
2.097(40),
1.755(40),
1.636(60),
1.409(30),
1.366(50)
XRD chart Akimotoite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

4.0 (berechnet)

4.008 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Australien/Queensland/South Gregory/Tenham-Meteorit

Preface

Name from

Benannt nach Syun-iti Akimoto, Mitglied am Geophysikalischen Institut von Tokyo.

Author (Name, Year)

Tomioka & Fujino, 1999

References

American Mineralogist 84 (1999), 267

Änderung der Strunz 9 ID auf 4.CB.05 anstelle von 9.DA.05 (Materials Data) da offensichtlicher Fehler (8. Sept. 2009)

Nicki C. Siersch; Giacomo Criniti; Alexander Kurnosov; Tiziana Boffa Ballaran; Zhaodong Liu, Takayuki Ishii; Daniel J. Frost; Tony Yu; Yanbin Wang: The influence of Al2O3 on the structural properties of MgSiO3 akimotoite. American Mineralogist Vol. 108, Nr. 1 (2023) S. 100-109. doi: 10.2138/am-2022-8257

IMA group assignments

Other languages

German

Akimotoit

English

Akimotoite

French

Akimotoite

Spanish

Akimotoíta

Russian

Акимотоит

CNMNC (IMA)-Number

IMA 1997-044

CNMNC symbol

Symbol

Aki

Locations with GPS information