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Ominelite

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Formula:
(Fe
2+
 
,Mg)(Al,Fe
3+
 
)
 
3
(SiO
 
4
)(BO
 
3
)O
 
2
System:OrthorhombicColour:Blue
Hardness:7


Fe analogue of Grandidierite.

Classification of Ominelite

IMA status:Approved 1999
Strunz 8th edition ID:8/B.31-42
Nickel-Strunz 10th (pending) edition ID: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

Type Locality:Misen River, Omine Mts, Tenkawa village, Yoshino-gun, Nara Prefecture, Kinki Region, Honshu Island, Japan
Geological Setting of type material:In a porphyritic granite and granodiorite.
Associated Minerals at type locality:
ZirconTopazSericiteSekaninaiteSchorl
QuartzPyriteMuscoviteMuscoviteMonazite
IlmeniteGarnet Structural GroupCordieriteChlorite GroupBiotite
ApatiteAndalusiteAlkali FeldsparAlbite-Anorthite Series

Physical Properties of Ominelite

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

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:
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°
Maximum Birefringence:δ = 0.025

Chart 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:
(Fe
2+
 
,Mg)(Al,Fe
3+
 
)
 
3
(SiO
 
4
)(BO
 
3
)O
 
2
Essential elements:Al, B, Fe, O, Si
All elements listed in formula:Al, B, Fe, Mg, O, Si
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:
(Fe
 
0.92
Mg
 
0.09
Mn
 
0.02
Zn
 
0.01
)
 
Σ1.04
Al
 
2.97
B
 
0.97
(Si
 
1.01
P
 
0.01
)
 
Σ1.02
O
 
9.00

Relationship of Ominelite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AJ.05Grandidierite
(Mg,Fe
2+
 
)(Al,Fe
3+
 
)
 
3
(SiO
 
4
)(BO
 
3
)O
 
2
9.AJ.10Dumortierite
(Al,Fe
3+
 
)
 
7
(SiO
 
4
)
 
3
(BO
 
3
)O
 
3
9.AJ.10Holtite
Al
 
6
(Al,Ta)(SiO
 
4
,SbO
 
4
,AsO
 
4
)
 
3
(BO
 
3
)O
 
3
9.AJ.10Magnesiodumortierite
(Mg,Ti,◻(Al,Mg)
 
2
Al
 
4
Si
 
3
O
 
18-y
(OH)
 
y
B y = 2-3
9.AJ.15Garrelsite
Ba
 
3
NaSi
 
2
B
 
7
O
 
16
(OH)
 
4
9.AJ.20Bakerite
Ca
 
4
(H
 
5
B
 
5
Si
 
3
O
 
20
)
9.AJ.20Datolite
Ca(HBSiO
 
5
)
9.AJ.20Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10
9.AJ.20Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
Si
 
2
O
 
10
9.AJ.20Hingganite-(Ce)
(Ce,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
9.AJ.20Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
9.AJ.20Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
9.AJ.20Homilite
Ca
 
2
(Fe
2+
 
,Mg)B
 
2
Si
 
2
O
 
10
9.AJ.20Melanocerite-(Ce)
(Ce,Ca)
 
5
(Si,B)
 
3
O
 
12
(OH,F) · nH
 
2
O
9.AJ.20Minasgeraisite-(Y)
CaBe
 
2
Y
 
2
Si
 
2
O
 
10
9.AJ.20Calcybeborosilite-(Y)
(Y,Ca)
 
2
(□,Fe
2+
 
)(B,Be)
 
2
[SiO
 
4
]
 
2
(OH,O)
 
2
9.AJ.25Stillwellite-(Ce)
(Ce,La,Ca)BSiO
 
5
9.AJ.30Cappelenite-(Y)
Ba(Y,Ce)
 
6
Si
 
3
B
 
6
O
 
24
F
 
2
9.AJ.35Okanoganite-(Y)
(Na,Ca)
 
3
(Y,Ce)
 
12
Si
 
6
B
 
2
O
 
27
F
 
14
9.AJ.35Vicanite-(Ce)
(Ca,Ce,La,Th)
 
15
As
5+
 
(As
3+
0.5
,Na
 
0.5
)Fe
3+
 
Si
 
6
B
 
4
O
 
40
F
 
7
9.AJ.35Hundholmenite-(Y)
(Y,REE,Ca,Na)
 
15
(Al,Fe
3+
 
)(Ca
 
x
As
3+
1-x
)(Si,As
5+
 
)Si
 
6
B
 
3
(O,F)
 
48
9.AJ.35Proshchenkoite-(Y)
Ca(Y,REE,Ca,Na,Mn)
 
15
Fe
2+
 
(P,Si)Si
 
6
B
 
3
O
 
34
F
 
14
9.AJ.40Jadarite
LiNaSiB
 
3
O
 
7
(OH)

Other Names for Ominelite

Synonyms:
IMA1999-025
Other Languages:
German:Ominelit
Russian:Оминелит
Spanish:Ominelita

Other Information

Health Warning: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

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    • Localities for Ominelite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • Honshu Island
      • Kinki Region
        • Nara Prefecture
          • Yoshino-gun
            • Tenkawa village
              • Omine Mts
    		Amer.Min.(2002) 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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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