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Ominelite

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Formula:
(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
System:
Orthorhombic
Colour:
Blue
Hardness:
7
Fe analogue of Grandidierite.

Classification of Ominelite

Approved 1999
9.AJ.05

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
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Type Occurrence of Ominelite

Geological Setting of Type Material:
In a porphyritic granite and granodiorite.

Physical Properties of Ominelite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Blue
Streak:
Pale blue
Hardness (Mohs):
7
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.2 g/cm3 (Calculated)

Crystallography of Ominelite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 10.343Å, b = 11.095Å, c = 5.7601Å
Ratio:
a:b:c = 0.932 : 1 : 0.519
Unit Cell Volume:
V 661.00 ų (Calculated from Unit Cell)
Z:
4
Morphology:
No forms mentioned.
Twinning:
None mentioned.
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.21 (vs)
5.05 (vvs)
2.97 (s)
2.79 (s)
2.18 (s)

Optical Data of Ominelite

Type:
Biaxial (-)
RI values:
nα = 1.631 nβ = 1.654 nγ = 1.656
2V:
Measured: 31° , Calculated: 32°
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong

Chemical Properties of Ominelite

Formula:
(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
Essential elements:
All elements listed in formula:
Analytical Data:
Means of five sets of electron microprobe data.
MgO (1.20%)
CaO (0%)
MnO (0.44%)
FeO (21.05%)
ZnO (0.20%)
B2O3 (10.69%)
Al2O3 (47.98%)
SiO2 (19.22%)
P2O5 (0.21%)
F (0%)

Total: 100.99 wt.%
Empirical Formula:
(Fe0.92Mg0.09Mn0.02Zn0.01)Σ1.04Al2.97B0.97(Si1.01P0.01)Σ1.02O9.00

Relationship of Ominelite to other Species

9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4
9.AJ.20BakeriteCa4(H5B5Si3O20)
9.AJ.20DatoliteCa(HBSiO5)
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14
9.AJ.40JadariteLiNaSiB3O7(OH)

Other Names for Ominelite

Name in Other Languages:
German:Ominelit
Spanish:Ominelita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ominelite

Reference List:
American Mineralogist (2002): 87: 160–170.

Internet Links for Ominelite

Localities for Ominelite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Žďár nad Sázavou
CEMPÍREK, Jan a Milan NOVÁK a Zdeněk DOLNÍČEK a Jana KOTKOVÁ a Radek ŠKODA. Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic American Mineralogist, Mineralogical Society of America, 95, 10, od s. 1533-1547, 15 s. ISSN 0003-004X. 2010
Japan (TL)
 
  • Honshu Island
    • Kinki Region
      • Nara Prefecture
        • Yoshino-gun
          • Tenkawa village
            • Omine Mts
Hiroi Y, Grew E S, Motoyoshi Y, Peacor D R, Rouse R C, Matsubara S, Yokoyama K, Miyawaki R, Mcgee J J, Su S, Hokada T, Furukawa N, Shibasaki H (2001) Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+ analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist 87, 160-170
Norway
 
  • Rogaland
    • Lund
      • Flatestøl
Hiroi, Y. et al. (2002): Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+ analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist 87: 160- 170 + Kristiansen, R. (2007): Originalbeskrevne mineraler fra Norge i et nytt årtusen. STEIN 34 (1), 30-34
Mineral and/or Locality  
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