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Ominelite Mineral Data

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General Ominelite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)Al3BSiO9
Help on Composition: Composition: Molecular Weight = 316.53 gm
   Magnesium   0.77 %  Mg    1.27 % MgO
   Aluminum   25.57 %  Al   48.32 % Al2O3
   Iron       15.88 %  Fe   20.43 % FeO
   Silicon     8.87 %  Si   18.98 % SiO2
   Boron       3.42 %  B    11.00 % B2O3
   Oxygen     45.49 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.9Mg0.1Al3BSiO9
Help on Environment: Environment: Accessory mineral found in a high alumina porphyritic granite of Miocene age associated with sekaninaite (Fe cordierite). Fe 2+ -analogue of grandidierite.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Omine Mountains near the misen River at Tenkawa, Yoshio, Nara Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA1999-025

Ominelite Image

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Comments: Photomicrograph of thin-section (plain light) of zoned ominelite (omn) with quartz (qtz) and plagioclase (pl) in alkali feldspar. (AmMin 87:163).
Location: Misen River in Tenkawa, Yoshino, Nara Prefecture, Japan. Scale: Grain size 0.6 mm.
© American Mineralogist

Ominelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9311:1:0.5183
Help on Cell Dimensions: Cell Dimensions: a = 10.363, b = 11.129, c = 5.769, Z = 4; V = 665.34 Den(Calc)= 3.16
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.05(1), 5.21(0.9)(200), 2.18(0.75)(150,421,312),2.79(0.75)(040), 2.97(0.75)(101), 2.9(0.5), 3.51(0.5)(130), 3.73(0.5)(121), 5.57(0.5)(020),

Physical Properties of Ominelite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Equant Grains - Granular material with equel dimensions in x, y, and z.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale blue

Optical Properties of Ominelite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KC= 0.2041
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (-), a=1.631, b=1.654, g=1.656, bire=0.0250, 2V(Calc)=32, 2V(Meas)=31.5. Dispersion strong, r >> v.

Calculated Properties of Ominelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Ominelite =3.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEOminelite = 5.87 barns/electron
U=PEOminelite x rElectron Density= 18.12 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ominelite is Not Radioactive

Ominelite Classification

Help on  Dana Class: Dana Class: (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.01)with (BO3)
  (54.01.01)Grandidierite Group Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AJ.05 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
09.AJ.05 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m
09.AJ.05 Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

Other Ominelite Information

Help on References: References: NAME( AmMin, Vol 87, p 160) PHYS. PROP.(AmMin, Vol 87, p 160) OPTIC PROP.(AmMin, Vol 87, p 160)
Help on See Also: See Also: Links to other databases for Ominelite :
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.AJ.05





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