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Momoiite

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Formula:
(Mn2+,Ca)3V23+(SiO4)3
System:
Isometric
Colour:
Green, greenish-yellow, ...
Lustre:
Vitreous
Hardness:
Name:
Named by H. Tanaka et al. in 2010 in honor of Hitoshi Momoi (20 January 1930, Tokyo, Japan - 26 February 2002), mineralogist and Profesor at Ehime University, Japan. He was an expert on manganese and first recognised the presence of a Mn3V2Si3O12 component in garnet.
Garnet Group.
A garnet with this formula had previously been described as "Yamatoite" (qv), a species which was later discredited because the type material was not truly Mn-V-dominant, although the name "yamatoite" continued to be used for the hypothetical Mn-V-garnet molecule.

Note that the alleged photos of momoiite may in fact be showing goldmanite and it is not possible to visually distinguish them without individual analysis.


Classification of Momoiite

Approved
Approval Year:
2009
First Published:
2010
9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
51.4.4.5

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

Physical Properties of Momoiite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Green, greenish-yellow, emerald-green
Streak:
Dull green
Hardness (Mohs):
Density:
4.01 g/cm3 (Measured)    

Chemical Properties of Momoiite

Formula:
(Mn2+,Ca)3V23+(SiO4)3
IMA Formula:
Mn32+V23+(SiO4)3
Elements listed in formula:

Crystallography of Momoiite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Ia3d
Cell Parameters:
a = 11.9242(7) Å
Unit Cell Volume:
V 1,695.46 ų (Calculated from Unit Cell)
Comment:
Ia-3d
X-Ray Powder Diffraction Data:
d-spacingIntensity
2.982 (78)
2.667 (100)
2.435 (42)
2.339 (20)
2.178 (20)
1.935 (21)
1.654 (20)
1.594 (30)

Type Occurrence of Momoiite

Place of Conservation of Type Material:
Hokkaido University Museum, Sapporo, Japan, 07401.
Geological Setting of Type Material:
Small manganese ore deposit developed in pelitic schist
Associated Minerals at Type Locality:

Relationship of Momoiite to other Species

Other Members of Group:
AlmandineFe32+Al2(SiO4)3
AndraditeCa3Fe23+(SiO4)3
Berzeliite(NaCa2)Mg2(AsO4)3
Bitikleite Group
BlythiteMn32+Mn23+[SiO4]3
Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
GoldmaniteCa3V23+(SiO4)3
GrossularCa3Al2(SiO4)3
HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
HutcheoniteCa3Ti2(SiAl2)O12
IrinarassiteCa3Sn2Al2SiO12
KatoiteCa3Al2(SiO4)3-x(OH)4x
KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
KhohariteMg3Fe23+(SiO4)3
KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
KnorringiteMg3Cr2(SiO4)3
MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
Menzerite-(Y){(Y,REE),(Ca,Fe2+)}3{(Mg,Fe2+),(Fe3+,Al)}2[SiO4]3
MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
Palenzonaite(Ca,Na)3CaMn22+(VO4)3
PyropeMg3Al2(SiO4)3
SchäferiteCa2NaMg2(VO4)3
SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
SkiagiteFe32+Fe23+[SiO4]3
SpessartineMn32+Al2(SiO4)3
ToturiteCa3Sn2(SiO4)(Fe3+O4)2
UM1984-37-SiO:CrMnMn32+(Cr3+,Mn3+)2Si3O12
UvaroviteCa3Cr2(SiO4)3
YafsoaniteCa3Zn3(TeO6)2
9.AD.05LarniteCa2SiO4
9.AD.10Calcio-olivineCa2SiO4
9.AD.15MerwiniteCa3Mg(SiO4)2
9.AD.20BredigiteCa7Mg(SiO4)4
9.AD.25AndraditeCa3Fe23+(SiO4)3
9.AD.25AlmandineFe32+Al2(SiO4)3
9.AD.25Calderite(Mn2+,Ca)3(Fe3+,Al)2(SiO4)3
9.AD.25GoldmaniteCa3V23+(SiO4)3
9.AD.25GrossularCa3Al2(SiO4)3
9.AD.25HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
9.AD.25HibschiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25HydroandraditeCa3Fe23+(SiO4)3-x(OH)4x
9.AD.25KatoiteCa3Al2(SiO4)3-x(OH)4x
9.AD.25KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
9.AD.25KnorringiteMg3Cr2(SiO4)3
9.AD.25MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
9.AD.25MorimotoiteCa3(Ti,Fe2+,Fe3+)2((Si,Fe3+)O4)3
9.AD.25PyropeMg3Al2(SiO4)3
9.AD.25SchorlomiteCa3(Ti,Fe3+)2((Si,Fe3+)O4)3
9.AD.25SpessartineMn32+Al2(SiO4)3
9.AD.25UvaroviteCa3Cr2(SiO4)3
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3
9.AD.25HoltstamiteCa3(Al,Mn3+)2(SiO4)2(OH)4
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2
9.AD.25EltyubyuiteCa12Fe103+Si4O32Cl6
9.AD.25HutcheoniteCa3Ti2(SiAl2)O12
9.AD.30Coffinite(U4+,Th)(SiO4)1-x(OH)4x
9.AD.30HafnonHf(SiO4)
9.AD.30ThoriteTh(SiO4)
9.AD.30ZirconZr(SiO4)
9.AD.30Stetindite-(Ce)Ce(SiO4)
9.AD.35HuttoniteThSiO4
9.AD.35Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
9.AD.40EulytineBi4(SiO4)3
9.AD.45ReiditeZrSiO4

Other Names for Momoiite

Name in Other Languages:

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 Momoiite

Reference List:
Williams, P.A., Hatert, F., Pasero, M. (2009) New minerals approved in 2009. in International Mineralogical Association, 1-34.

Tanaka, H., Endo, S., Minakawa, T., Enami, M., Nishio-Hamane, D., Miura, H., Hagiwara, A. (2010) Momoiite, (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan. Journal of Mineralogical and Petrological Sciences: 105: 92-96. [http://www.jstage.jst.go.jp/article/jmps/105/2/92/_pdf]

Matsubara, S., Miyawaki, R., Yokoyama, K., Shigeoka, M., Miyajima, H., Suzuki, Y., Murakami, O., Ishibashi, T. (2010) Momoiite and nagashimalite from the Tanohata mine, Iwate Prefecture, Japan. Bulletin of the National Museum of Nature and Science, Series C: 36: 1-6.

Grew, E.S., Locock, A.J., Mills, S.J., Galuskina, I.O., Galuskin, E.V., Hålenius, U. (2013) Nomenclature of the garnet supergroup. American Mineralogist: 98: 785-811.

Cámara, F., Diego Gatta, G., Belakovskiy, D. (2014) New mineral names. American Mineralogist: 99: 551-555.

Internet Links for Momoiite

mindat.org URL:
https://www.mindat.org/min-39634.html
Please feel free to link to this page.

Localities for Momoiite

This 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.
Japan
 
  • Honshu Island
    • Chubu Region
      • Fukui Prefecture
        • Mikata-kaminaka-gun
          • Wakasa-cho
Tanaka, H. et al. (2010) Momoiite (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan. Journal of Mineralogical and Petrological Sciences 105, 92-96. [http://www.jstage.jst.go.jp/article/jmps/105/2/92/_pdf]
    • Kinki Region
      • Kyoto Prefecture
        • Kizugawa City
Tanaka, H. et al. (2010) Momoiite (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan. Journal of Mineralogical and Petrological Sciences 105, 92-96. [http://www.jstage.jst.go.jp/article/jmps/105/2/92/_pdf]
    • Tohoku Region
      • Iwate Prefecture
        • Shimohei-gun
          • Tanohata-mura
Satoshi Matsubara, et al (2008) JAKOKA: 2008 Annual Meeting of the Japan Association of Mineralogical Sciences, R4-02
Matsubara, S., Miyawaki, R., Yokoyama, K., Shigeoka, M., Miyajima, H., Suzuki, Y., ... & Ishibashi, T. (2010). Momoiite and nagashimalite from the Tanohata mine, Iwate Prefecture, Japan. Bulletin of the National Museum of Nature and Science C, 36, 1-6.
  • Shikoku Island
    • Ehime Prefecture
      • Saijo City
Tanaka, H. et al. (2010) Momoiite (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan. Journal of Mineralogical and Petrological Sciences 105, 92-96. [http://www.jstage.jst.go.jp/article/jmps/105/2/92/_pdf]
Mineral and/or Locality  
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