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Morimotoite

Big Photo

Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
© Pavel M. Kartashov

Formula:
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
)O
 
4
]
 
3
 (?)
System:IsometricColour:Black
Lustre:AdamantineHardness:7½
Name:For Japanese mineralogist, Nobuo Morimoto (b. 1925).


Garnet Group

Classification of Morimotoite

IMA status:Approved 1992
Strunz 8th edition ID:8/A.08-125
Nickel-Strunz 10th (pending) edition ID:9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
Dana 8th edition ID:51.4.3c.3

51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
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Type Occurrence of Morimotoite

Type Locality:Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
Year of Discovery:1995
Geological Setting of type material:endoskarn in altered monzonite

Physical Properties of Morimotoite

Lustre:Adamantine
Diaphaneity (Transparency):Translucent on thin edges
Colour:Black
Streak:Grey
Hardness (Mohs):7½
Hardness Data:Measured
Cleavage:None Observed
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):3.8 g/cm3
Density (calculated):3.75 g/cm3

Crystallography of Morimotoite

Crystal System:Isometric
Cell Parameters:a = 12.162Å
Unit Cell Volume:V 1,798.93 ų (Calculated from Unit Cell)
Morphology:subhedral embedded grains

Epitaxial Relationships of Morimotoite

Epitaxial Minerals:
Andradite-Grossular Series
Epitaxi Comments:outer growth rim
X-Ray Powder Diffraction:
d-spacingIntensity
3.04 (70)
2.72 (100)
2.59 (20)
2.48 (50)
2.385 (25)
1.97 (20)
1.69 (30)

Optical Data of Morimotoite

Type:Isotropic

Chemical Properties of Morimotoite

Formula:
Ca
 
3
(Ti,Fe
2+
 
,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
)O
 
4
]
 
3
 (?)
Essential elements:Ca, Fe, O, Si, Ti
All elements listed in formula:Ca, Fe, O, Si, Ti
Analyical Data:
SiO2 (26.9)
TiO2 (18.5)
ZrO2 (1.48)
Al2O3 (0.97)
Fe2O3 (11.4)
FeO (7.78)
MnO (0.23)
MgO (0.87)
CaO (31.35)
Common Impurities:Zr,Al,Mn,Mg

Relationship of Morimotoite to other Species

Member of:Garnet Group
Related Minerals - Nickel-Strunz Grouping):
9.AD.05Larnite
Ca
 
2
[SiO
 
4
]
9.AD.05Calcio-Olivine
Ca
 
2
[SiO
 
4
]
9.AD.15Merwinite
Ca
 
3
Mg[SiO
 
4
]
 
2
9.AD.20Bredigite
Ca
 
7
Mg[SiO
 
4
]
 
4
9.AD.25Andradite
Ca
 
3
Fe
3+
2
[SiO
 
4
]
 
3
9.AD.25Almandine
Fe
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Calderite
(Mn
2+
 
,Ca)
 
3
(Fe
3+
 
,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Goldmanite
Ca
 
3
(V
3+
 
,Al,Fe
3+
 
)
 
2
[SiO
 
4
]
 
3
9.AD.25Grossular
Ca
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
[(OH)
 
4
|(SiO
 
4
)
 
2
]
9.AD.25Hibschite
Ca
 
3
Al
 
2
[(OH)
 
6-1
|(SiO
 
4
)
 
1.5-2.5
]
9.AD.25Hydroandradite
9.AD.25Katoite
Ca
 
3
Al
 
2
[(OH)
 
8-6
|(SiO
 
4
)
 
1-1.5
]
9.AD.25Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
[(Si,Al,Fe
3+
 
)O
 
4
]
 
3
9.AD.25Knorringite
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
9.AD.25Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
[SiO
 
4
]
 
3
9.AD.25Pyrope
Mg
 
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Schorlomite
Ca
 
3
(Ti,Fe
3+
 
)
 
2
[(Si,Fe
3+
 
,Fe
2+
 
)O
 
4
]
 
3
9.AD.25Spessartine
Mn
2+
3
Al
 
2
[SiO
 
4
]
 
3
9.AD.25Uvarovite
Ca
 
3
Cr
 
2
[SiO
 
4
]
 
3
9.AD.25Wadalite
Ca
 
6
(Al,Mg)
 
4
[Cl
 
3
|O
 
4
|{(Si,Al,Fe
3+
 
)O
 
4
}
 
3
]
9.AD.25Holtstamite
Ca
 
3
(Al,Mn
3+
 
)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
9.AD.30Coffinite
(U,Th)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Hafnon
(Hf,Zr)[SiO
 
4
]
9.AD.30Thorite
(Th,U)[SiO
 
4
]
9.AD.30Thorogummite
(Th,U)[(OH)
 
4x
|(SiO
 
4
)
 
1-x
]
9.AD.30Zircon
Zr[SiO
 
4
]
9.AD.35Huttonite
Th[SiO
 
4
]
9.AD.35Tombarthite-(Y)
Y
 
4
[HSiO
 
4
]
 
3
9.AD.40Eulytine
Bi
 
4
[SiO
 
4
]
 
3
9.AD.45Reidite
Zr[SiO
 
4
]

Other Names for Morimotoite

Synonyms:
IMA1992-017
German names:
Morimotoit
Spanish names:
Morimotoita

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 Morimotoite

Reference List:Mineralogical Magazine: 27: 304.

Henmi, et al. (1995), Mineralogical Magazine: 59: 115-120.

Mineralogical Magazine (1997): 61: 728-730.

Armbruster, Th., Birrer, J., Libowitzky, E., Beran, A. (1998): Crystal chemistry of Ti-bearing andradites, European Journal of Mineralogy, Vol. 10, 907-921

Internet Links for Morimotoite

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    Localities for Morimotoite

    (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
      • Chugoku Region
        • Okayama Prefecture
          • Takahashi
            • Bitchu-cho (Bicchu-cho)
    		Mineralogical Magazine (1995): 59: 115-120; Mineralogical Record: 27: 304.
    USA
     
    • California
    		Armbruster, Th., Birrer, J., Libowitzky, E., Beran, A. (1998): Crystal chemistry of Ti-bearing andradites, European Journal of Mineralogy, Vol. 10, 907-921
    Mineral and/or Locality
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