Mineralogy Database

Akimotoite Mineral Data

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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

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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 - Rhombohedral H-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),

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)Simple Oxides
  (04.03)with a cation charge of 3+ (A+++2 O3)
  (04.03.05)Ilmenite Group Ilmenite FeTiO3 R 3 3 Geikielite MgTiO3 R 3 3 Pyrophanite MnTiO3 R 3 3 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3 Melanostibite Mn(Sb,Fe)O3 R 3 3 Brizziite-III NaSbO3 R 3 3 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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Dana No: Strunz No: 09.DA.05





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