Akimotoite Mineral Data
General Akimotoite Information
Chemical Formula:
(Mg,Fe)SiO3
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
Empirical Formula:
Mg0.75 Fe2+ 0.25 SiO3
Environment:
Found in fragments within veins of shock-induced melt. A member of the Ilmenite group. Dimorphic relationship with enstatite and clinoenstatite.
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Tenham chondritic meteorite, which fell in 1879 in South Gregory, Queensland, Australia. Link to MinDat.org Location Data.
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
Name Pronunciation:
Akimotoite + Pronunciation
Synonym:
IMA1997-044
Akimotoite Image
Images:
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
Axial Ratios:
a:c = 1:2.84518
Cell Dimensions:
a = 4.78, c = 13.6, Z = 4; V = 269.11 Den(Calc)= 2.67
Crystal System:
Trigonal - Rhombohedral H-M Symbol ( 3 ) Space Group: R 3
X Ray Diffraction:
By Intensity(I/Io ): 2.616(1), 1.636(0.65), 3.509(0.61),
Physical Properties of Akimotoite
Color:
Colorless.
Diaphaneity:
Transparent
Luster:
Vitreous (Glassy)
Optical Properties of Akimotoite
Optical Data:
NCalc= 1.54 - from Gladstone-Dale relationship (KC = 0.2024) where Ncalc =Dcalc *KC +1
Calculated Properties of Akimotoite
Electron Density:
Bulk Density (Electron Density)=2.64 gm/cc note: Specific Gravity of Akimotoite =2.67 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEAkimotoite = 5.17 barns/electronU=PEAkimotoite x r Electron Density= 13.64 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Akimotoite is Not Radioactive
Akimotoite Classification
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
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
References:
NAME( AmMin, Vol 84) PHYS. PROP.(Eur. J. Min.,Vol.10,1998)
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:
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