Ominelite Mineral Data

Ominelite Mineral Data

General Ominelite Information

Chemical Formula:

(Fe++,Mg)Al3BSiO9

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

Empirical Formula:

Fe²⁺_0.9Mg_0.1Al₃BSiO₉

Environment:

Accessory mineral found in a high alumina porphyritic granite of Miocene age associated with sekaninaite (Fe cordierite). Fe 2+ -analogue of grandidierite.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Omine Mountains near the misen River at Tenkawa, Yoshio, Nara Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA1999-025

Ominelite Image

Images:

Ominelite

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

Axial Ratios:

a:b:c =0.9311:1:0.5183

Cell Dimensions:

a = 10.363, b = 11.129, c = 5.769, Z = 4; V = 665.34 Den(Calc)= 3.16

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

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

By Intensity(I/I_o): 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),

Crystal Structure:

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Hiroi Y , Grew E S , Motoyoshi Y , Peacor D R , Rouse R C , Matsubara S , Yokoyama K , Miyawaki R , McGee J J , Su S-C , Hokada T , Furukawa N , Shibasaki H , American Mineralogist , 87 (2002) p.160-170, Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+ analogue of grandidierite),, a new mineral from porphyritic granite in Japan

Physical Properties of Ominelite

Cleavage:

None

Color:

Blue.

Diaphaniety:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Ominelite

Gladstone-Dale:

CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KC= 0.2041

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

Electron Density:

r_electron=3.09 gm/cc
note: r_Ominelite=3.16 gm/cc.

Fermion Index

Fermion Index = 0.01529
Boson Index = 0.98471

Photoelectric:

PE_Ominelite= 5.87 barns/electron
U=PE_Ominelite x r_electron= 18.12 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ominelite is Not Radioactive

Ominelite Classification

Dana Class:

54.1.1.2 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.1)with (BO3)

(54.1.1)Dana Group

54.1.1.1 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

54.1.1.2 Ominelite ! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

Strunz Class:

VIII/B.31-42 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.31 - Kornerupine - Harkerite series

VIII/B.31-10 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

VIII/B.31-12 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

VIII/B.31-15 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

VIII/B.31-20 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m

VIII/B.31-30 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m

VIII/B.31-40 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

VIII/B.31-42 Ominelite (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

VIII/B.31-45 Boralsilite! Al16B6Si2O27 C 2/m 2/m

VIII/B.31-50 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

VIII/B.31-60 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Other Ominelite Information

References:

NAME( AmMin, Vol 87, p 160) PHYS. PROP.(AmMin, Vol 87, p 160) OPTIC PROP.(AmMin, Vol 87, p 160)

See Also:

Links to other databases for Ominelite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ominelite

(Fe++,Mg)Al3BSiO9
Dana No: 54.1.1.2 Strunz No: VIII/B.31-42
Locality:

Notes: