Akimotoite Mineral Data

Akimotoite Mineral Data +

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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:

Mg_0.75Fe²⁺_0.25SiO₃

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

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

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

Crystal Structure:

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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

Color:

Colorless.

Diaphaniety:

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:

r_electron=2.64 gm/cc
note: r_Akimotoite=2.67 gm/cc.

Fermion Index

Fermion Index = 0.03189
Boson Index = 0.96811

Photoelectric:

PE_Akimotoite= 5.17 barns/electron
U=PE_Akimotoite x r_electron= 13.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Akimotoite is Not Radioactive

Akimotoite Classification

Dana Class:

4.3.5.7 (4)Simple Oxides

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

(4.3.5)Dana Group

4.3.5.1 Ilmenite FeTiO3 R 3 3

4.3.5.2 Geikielite MgTiO3 R 3 3

4.3.5.3 Pyrophanite MnTiO3 R 3 3

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

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

4.3.5.6 Brizziite-III NaSbO3 R 3 3

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

Strunz Class:

IV/C.05-05 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.05 - Ilmenite group, Geikilith - Brizziite series

IV/C.05-05 Akimotoite (Mg,Fe)SiO3 R 3 3

IV/C.05-10 Geikielite MgTiO3 R 3 3

IV/C.05-20 Ilmenite FeTiO3 R 3 3

IV/C.05-30 Pyrophanite MnTiO3 R 3 3

IV/C.05-40 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

IV/C.05-50 Melanostibite Mn(Sb,Fe)O3 R 3 3

IV/C.05-60 Brizziite-III NaSbO3 R 3 3

IV/C.05-60* Brizziite-VII NaSbO3 R 3 3

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 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Akimotoite

(Mg,Fe)SiO3
Dana No: 4.3.5.7 Strunz No: IV/C.05-05
Locality:

Notes: