Ominelite
A valid IMA mineral species
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About Ominelite
View of Mount Ōmine, Ōmine Mts, Nara Prefecture, Japan
Formula:
(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
Colour:
Blue
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.169 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in 2002 by Yoshikuni Hiroi et al. for the Omine Mountain(s), Japan, the type locality.
Unique Identifiers
Mindat ID:
10796
Long-form identifier:
mindat:1:1:10796:5
IMA Classification of Ominelite
Approved
IMA Formula:
Fe2+Al3O2(BO3)(SiO4)
Approval year:
1999
First published:
2002
Type description reference:
Hiroi, Yoshikuni, Grew, Edward S., Motoyoshi, Yoichi, Peacor, Donald R., Rouse, Roland C., Matsubara, Satoshi, Yokoyama, Kazumi, Miyawaki, Ritsuro, Mcgee, James J., Su, Shu-Chun, Hokada, Tomokazu, Furukawa, Noboru, Shibasaki, Hiroshi (2002) Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist, 87 (1) 160-170 doi:10.2138/am-2002-0117
Classification of Ominelite
9.AJ.05
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Omi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ominelite
Vitreous
Transparency:
Transparent
Colour:
Blue
Streak:
Pale blue
Hardness:
7 on Mohs scale
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.169 g/cm3 (Calculated)
Optical Data of Ominelite
Type:
Biaxial (-)
RI values:
nα = 1.631(1) nβ = 1.654(1) nγ = 1.656(1)
2V:
Measured: 31° , Calculated: 32°
Max. Birefringence:
δ = 0.025
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
strong
Pleochroism:
Visible
Comments:
X = Z = pale blue-green, Y = colorless.
Chemistry of Ominelite
Mindat Formula:
(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
Element Weights:
Crystallography of Ominelite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Cell Parameters:
a = 10.343(2) Å, b = 11.095(1) Å, c = 5.7601(8) Å
Ratio:
a:b:c = 0.932 : 1 : 0.519
Unit Cell V:
661.00 ų (Calculated from Unit Cell)
Z:
4
Morphology:
elongated, euhedral to equant and anhedral grains to 0.5 mm; as lenticular to skeletal, rhombic prismatic needlelike crystals
Twinning:
None mentioned.
Comment:
Space Group: Pbnm
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0004354 | Ominelite | Dzikowski T J, Groat L A, Grew E S (2007) The geometric effects of VFe2+ for VMg substitution on the crystal structures of the grandidierite-ominelite series American Mineralogist 92 863-872 |  | 2007 | Almgjotheii, Rogaland, Norway | 0 | 293 |
| 0004355 | Ominelite | Dzikowski T J, Groat L A, Grew E S (2007) The geometric effects of VFe2+ for VMg substitution on the crystal structures of the grandidierite-ominelite series American Mineralogist 92 863-872 | | 2007 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.21 Å | (vs) |
| 2.97 Å | (s) |
| 2.79 Å | (s) |
| 2.18 Å | (s) |
| 5.57 Å | (m) |
| 3.73 Å | (m) |
| 3.51 Å | (m) |
Reference:
Hiroi, Yoshikuni, Grew, Edward S., Motoyoshi, Yoichi, Peacor, Donald R., Rouse, Roland C., Matsubara, Satoshi, Yokoyama, Kazumi, Miyawaki, Ritsuro, Mcgee, James J., Su, Shu-Chun, Hokada, Tomokazu, Furukawa, Noboru, Shibasaki, Hiroshi (2002) Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist, 87 (1) 160-170 doi:10.2138/am-2002-0117
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Ominelite
Place of Conservation of Type Material:
Department of Geology, National Science Museum, Tokyo, and Department of Earth Sciences, Chiba University, Chiba, Japan.
Geological Setting of Type Material:
In a porphyritic granite and granodiorite.
Associated Minerals at Type Locality:
Reference:
Hiroi, Yoshikuni, Grew, Edward S., Motoyoshi, Yoichi, Peacor, Donald R., Rouse, Roland C., Matsubara, Satoshi, Yokoyama, Kazumi, Miyawaki, Ritsuro, Mcgee, James J., Su, Shu-Chun, Hokada, Tomokazu, Furukawa, Noboru, Shibasaki, Hiroshi (2002) Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist, 87 (1) 160-170 doi:10.2138/am-2002-0117
Synonyms of Ominelite
Other Language Names for Ominelite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.AJ. | Hingganite-(Nd) | Nd2◻Be2Si2O8(OH)2 |
| 9.AJ. | Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 |
| 9.AJ.05 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 |
| 9.AJ.10 | Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| 9.AJ.10 | Nioboholtite | (Nb0.6◻0.4)Al6BSi3O18 |
| 9.AJ.10 | Titanoholtite | (Ti0.75◻0.25)Al6BSi3O18 |
| 9.AJ.10 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 |
| 9.AJ.10 | Magnesiodumortierite | Mg(Al2OH)(Al2O)2(SiO4)3(BO3) |
| 9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 |
| 9.AJ.20 | 'Muromontite' | near Be2FeY2Si3O12 |
| 9.AJ.20 | Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 |
| 9.AJ.20 | Datolite | CaB(SiO4)(OH) |
| 9.AJ.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,O) |
| 9.AJ.20 | Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 |
| 9.AJ.20 | Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
| 9.AJ.20 | 'Unnamed (OH-analogue of Gadolinite-(Y))' | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 |
| 9.AJ.20 | Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Hingganite-(Yb) | (Yb,Y,REE)2◻Be2[SiO4]2(OH)2 |
| 9.AJ.20 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 |
| 9.AJ.20 | 'Minasgeraisite-(Y)' | (Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4 |
| 9.AJ.20 | Calcybeborosilite-(Y) | (Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2 |
| 9.AJ.25 | Stillwellite-(La) | LaBSiO5 |
| 9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 |
| 9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 |
| 9.AJ.35 | Laptevite-(Ce) | Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11 |
| 9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 |
| 9.AJ.35 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 |
| 9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 |
| 9.AJ.35 | Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 |
| 9.AJ.40 | Jadarite | LiNaSiB3O7(OH) |
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.
Internet Links for Ominelite
mindat.org URL:
https://www.mindat.org/min-10796.html
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References for Ominelite
Reference List:
Hiroi, Yoshikuni, Grew, Edward S., Motoyoshi, Yoichi, Peacor, Donald R., Rouse, Roland C., Matsubara, Satoshi, Yokoyama, Kazumi, Miyawaki, Ritsuro, Mcgee, James J., Su, Shu-Chun, Hokada, Tomokazu, Furukawa, Noboru, Shibasaki, Hiroshi (2002) Ominelite, (Fe,Mg)Al3BSiO9 (Fe2+analogue of grandidierite), a new mineral from porphyritic granite in Japan. American Mineralogist, 87 (1) 160-170 doi:10.2138/am-2002-0117
Localities for Ominelite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Cempirek et al. (2010) |
Japan (TL) | |
| Hiroi et al. (2002) |
Norway | |
| Hiroi et al. (2002) +1 other reference |
| Cempírek J. et al. (2010) |
Quick NavTopAbout OmineliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Misen River, Omine Mountains, Tenkawa village, Yoshino district, Nara Prefecture, Japan