Akimotoite Mineral Data (original) (raw)

General Akimotoite Information

Help on Chemical Formula: Chemical Formula:

(Mg,Fe)SiO3

Help on Composition: Composition:

Molecular Weight = 108.27 gm

Magnesium 16.84 % Mg 27.92 % MgO

Iron 12.89 % Fe 16.59 % FeO

Silicon 25.94 % Si 55.49 % SiO2

Oxygen 44.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Mg0.75Fe2+0.25SiO3

Help on Environment: Environment:

Found in fragments within veins of shock-induced melt. A member of the Ilmenite group. Dimorphic relationship with enstatite and clinoenstatite.

Help on IMA Status: IMA Status:

Approved IMA 1998 (Dana # Added)

Help on Locality: Locality:

Tenham chondritic meteorite, which fell in 1879 in South Gregory, Queensland, Australia. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

Named after Syun-iti Akimoto (b. 1925), of the Institute of Geophysics and Solid State Physics, University of Tokyo, specialist in high-pressure research, especially on phase relati onships in the system (Mg,Fe)2 SiO4 at

Help on Name Pronunciation: Name Pronunciation:

Akimotoite + Pronunciation Say AKIMOTOITE

Help on Synonym: Synonym:

IMA1997-044

Akimotoite Image

Click Here for Larger Akimotoite Image in a New Browser Window Images:

Click Here for Larger Akimotoite Image Akimotoite Comments: Electron micrograph of akimotoite (Ak) as columnar grains. Aggregates of akimotoite are adjacent to a large clinoenstatite grain (Cen) with (100) twin lamallae. (AmMin 84:268). Location: Shock-metamorphosed Tenham chondrite.Scale: See Image. © American Mineralogist

Akimotoite Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:2.84518

Help on Cell Dimensions: Cell Dimensions:

a = 4.78, c = 13.6, Z = 4; V = 269.11 Den(Calc)= 2.67

Help on Crystal System: Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.616(1), 1.636(0.65), 3.509(0.61),

Click Here for Large Akimotoite Structure Window Crystal Structure:

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Help on Above

| | Horiuchi H , Hirano M , Ito E , Matsui Y , American Mineralogist , 67 (1982) p.788-793, MgSiO3 (ilmenite-type): Single crystal X-ray diffraction study | | --------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Akimotoite

Help on Color: Color:

Colorless.

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Luster: Luster:

Vitreous (Glassy)

Optical Properties of Akimotoite

Help on Optical Data: Optical Data:

NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.2024) where Ncalc=Dcalc*KC+1

Calculated Properties of Akimotoite

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.64 gm/cc
note: Specific Gravity of Akimotoite =2.67 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Help on Photoelectric: Photoelectric:

PEAkimotoite = 5.17 barns/electron
U=PEAkimotoite x rElectron Density= 13.64 barns/cc.

Help on Radioactivity: Radioactivity:

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

Akimotoite Classification

Help on Dana Class: Dana Class:

04.03.05.07 (04)Simple Oxides

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

(04.03.05)Ilmenite Group

04.03.05.01 Ilmenite FeTiO3 R 3 3

04.03.05.02 Geikielite MgTiO3 R 3 3

04.03.05.03 Pyrophanite MnTiO3 R 3 3

04.03.05.04 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

04.03.05.05 Melanostibite Mn(Sb,Fe)O3 R 3 3

04.03.05.06 Brizziite-III NaSbO3 R 3 3

04.03.05.07 Akimotoite! (Mg,Fe)SiO3 R 3 3

Help on Strunz Class: Strunz Class:

09.DA.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.05 Donpeacorite (Mn,Mg)MgSi2O6 P bca 2/m 2/m 2/m

09.DA.05 Akimotoite! (Mg,Fe)SiO3 R 3 3

09.DA.05 Enstatite Mg2Si2O6 P bca 2/m 2/m 2/m

09.DA.05 Ferrosilite (Fe,Mg)2Si2O6 P bca 2/m 2/m 2/m

Other Akimotoite Information

Help on References: References:

NAME( AmMin, Vol 84) PHYS. PROP.(Eur. J. Min.,Vol.10,1998)

Help on See Also: See Also:

Links to other databases for Akimotoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Akimotoite Specimen Label here :

Akimotoite

(Mg,Fe)SiO3
Dana No: 04.03.05.07 Strunz No: 09.DA.05
Locality:

Notes: