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Ominelite

Formula:
(Fe
2+
 
,Mg)(Al,Fe
3+
 
)
 
3
[O
 
2
|BO
 
3
|SiO
 
4
]
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 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)
421(

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
[O
 
2
|BO
 
3
|SiO
 
4
]
Essential elements:Al, B, Fe, O, Si
All elements listed in formula:Al, B, Fe, Mg, O, Si
Analyical 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
[O
 
2
|BO
 
3
|SiO
 
4
]
9.AJ.10Dumortierite
(Al,Fe
3+
 
)
 
7
[O
 
3
|BO
 
3
|(SiO
 
4
)
 
3
]
9.AJ.10Holtite
(Ta,Sb)Al
 
6
[O
 
3
|BO
 
3
|(SiO
 
4
)
 
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
B
 
4
[(OH)
 
4
|HBO
 
4
|(SiO
 
4
)
 
3
]
9.AJ.20Datolite
CaB[OH|SiO
 
4
]
9.AJ.20Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Hingganite-(Ce)
Ce
 
2
□Be
 
2
Si
 
2
O
 
8
(OH)
 
2
9.AJ.20Hingganite-(Y)
(Y,Yb,Er)Be[OH|SiO
 
4
]
9.AJ.20Hingganite-(Yb)
(Yb,Y)Be[OH|SiO
 
4
]
9.AJ.20Homilite
Ca
 
2
(Fe
2+
 
,Mg)B
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Melanocerite-(Ce)
(Ce,Ca)
 
5
(Si,B)
 
3
O
 
12
(OH,F)·nH
 
2
O
9.AJ.20Minasgeraisite-(Y)
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Calcybeborosilite-(Y)
(Y,Ca)
 
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.35IMA2008-007
(Y,REE,Ca,Na,Mn)
 
15
Fe
2+
 
Ca(P,Si)Si
 
6
B
 
3
(O,F)
 
48
9.AJ.40Jadarite
LiNaSiB
 
3
O
 
7
(OH)

Other Names for Ominelite

Synonyms:
IMA1999-025
German names:
Ominelit
Russian names:
Оминелит
Spanish names:
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

    Hide Locality List
    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.
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    (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.
    Japan
     
    • Honshu Island
      • Kinki Region
        • Nara Prefecture
          • Yoshino-gun
            • Tenkawa village
              • Omine Mts
    		Amer.Min.(2002) 87, 160-170
    Norway
     
    • Rogaland
      • Lund
        • Flatestøl
    		Amer.Min.(2002) 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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