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Momoiite

A valid IMA mineral species
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07632330017360851041923.jpg
Momoiite

Kurase mine, Saijo City, Ehime Prefecture, Japan
07313790017667607601583.jpg
Momoiite, etc.

Fujii mine, Wakasa-cho, Mikatakaminaka District, Fukui Prefecture, Japan
09390040017567703086194.jpg
Momoiite, etc.

Kurase mine, Saijo City, Ehime Prefecture, Japan
08181430017667607618602.jpg
Momoiite

Kurase mine, Saijo City, Ehime Prefecture, Japan
00122170017639150062327.jpg
Momoiite, etc.

Fujii mine, Wakasa-cho, Mikatakaminaka District, Fukui Prefecture, Japan
09390040017567703086194.jpg
Momoiite, etc.

Kurase mine, Saijo City, Ehime Prefecture, Japan
07632330017360851041923.jpg
Momoiite

Kurase mine, Saijo City, Ehime Prefecture, Japan
07313790017667607601583.jpg
Momoiite, etc.

Fujii mine, Wakasa-cho, Mikatakaminaka District, Fukui Prefecture, Japan
Hide all sections | Show all sections

About MomoiiteHide

08694390017272471851320.jpg
Hitoshi Momoi
Formula:
Mn2+3V3+2(SiO4)3
Colour:
Green, greenish-yellow, emerald-green
Lustre:
Vitreous
Hardness:
6½
Specific Gravity:
4.01
Crystal System:
Isometric
Name:
Named by H. Tanaka et al. in 2010 in honor of Hitoshi Momoi (桃井斉)(20 January 1930, Tokyo, Japan - 26 February 2002), mineralogist and Professor at Ehime University, Japan. He was an expert on manganese and first recognised the presence of a Mn3V2Si3O12 component in garnet.
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 these species without individual analysis.


Unique IdentifiersHide

Mindat ID:
39634
Long-form identifier:
mindat:1:1:39634:7

Similar NamesHide

MumbiteA synonym of 'Plumbomicrolite (of Hogarth 1977)'
MummeiteA valid IMA mineral speciesCu0.58Ag3.11Pb1.10Bi6.65S13

IMA Classification of MomoiiteHide

IMA status:
Approved
Approval year:
2009
First published:
2010

Classification of MomoiiteHide

Strunz-mindat (2026):
9.AD.25

9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
Dana 8th ed.:
51.4.4.5

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
MomIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MomoiiteHide

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

Chemistry of MomoiiteHide

Mindat Formula:
Mn2+3V3+2(SiO4)3
Element Weights:
Element% weight
O35.361 %
Mn30.356 %
V18.765 %
Si15.518 %

Calculated from ideal end-member formula.
O
Mn
V
Si
Elements listed:
Mn, O, Si, V - search for minerals with similar chemistry

Crystallography of MomoiiteHide

Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Ia3d
Setting:
Ia3d
Cell Parameters:
a = 11.9242(7) Å
Unit Cell V:
1,695.46 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.982 Å(78)
2.667 Å(100)
2.435 Å(42)
2.339 Å(20)
2.178 Å(20)
1.935 Å(21)
1.654 Å(20)
1.594 Å(30)
Locality:
Kurase mine, Saijo City, Ehime Prefecture, Japan

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-? alteration and/or metamorphism
32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits

Type Occurrence of MomoiiteHide

Type Locality:
ⓘ Kurase mine, Saijo City, Ehime Prefecture, Japan
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:
CalciteRhodochrositeTephroite

Synonyms of MomoiiteHide

Other Language Names for MomoiiteHide

Dutch:Momoiiet
German:Momoiit

Relationship of Momoiite to other SpeciesHide

Member of:
Garnet Group > Garnet Supergroup
Other Members of Garnet Group:
AlmandineFe2+3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
AndraditeCa3Fe3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
'Blythite'Mn2+3Mn3+2[SiO4]3
CalderiteMn2+3Fe3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
EringaiteCa3Sc2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
GoldmaniteCa3V3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
GrossularCa3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
'Khoharite'Mg3Fe3+2(SiO4)3
KnorringiteMg3Cr3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
MajoriteMg3(MgSi)(SiO4)3Iso. m3m(4/m32/m) : Ia3d
Menzerite-(Y)(Y2Ca)Mg2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
MorimotoiteCa3(TiFe2+)(SiO4)3Iso. m3m(4/m32/m) : Ia3d
PyropeMg3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
RubiniteCa3Ti3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
'Skiagite'Fe2+3Fe3+2[SiO4]3
SpessartineMn2+3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
'UM1984-37-SiO:CrMn'Mn2+3Cr3+2(SiO4)3
UvaroviteCa3Cr3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d

Common AssociatesHide

Associations Based on Photo Data:
4 photos of Momoiite associated with TephroiteMn2+2(SiO4)
2 photos of Momoiite associated with VuorelaineniteMn2+V3+2O4
1 photo of Momoiite associated with RhodoniteCaMn3Mn[Si5O15]

Related Minerals - Strunz-mindat GroupingHide

9.AD.AdrianiteCa12(Al4Mg3Si7)O32Cl6Iso. 43m : I43d
9.AD.05LarniteCa2SiO4Mon. 2/m : P21/c
9.AD.10Calcio-olivineCa2SiO4Orth. mmm(2/m2/m2/m) : Pnma
9.AD.15MerwiniteCa3Mg(SiO4)2Mon. 2/m : P21/c
9.AD.20BredigiteCa7Mg(SiO4)4Orth. mm2 : Pnn2
9.AD.25MidbariteCa3Mg2(V5+2Si)O12Iso. m3m(4/m32/m) : Ia3d
9.AD.25Menzerite-(Y)(Y2Ca)Mg2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25UvaroviteCa3Cr3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25EltyubyuiteCa12Fe3+10Si4O32Cl6Iso. 43m : I43d
9.AD.25EringaiteCa3Sc2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25HenritermieriteCa3Mn3+2(SiO4)2[◻(OH)4]Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AD.25 va'Hydrougrandite'(Ca,Mg,Fe2+)3(Fe3+,Al)2[(OH)4(SiO4)2]Iso.
9.AD.25CalderiteMn2+3Fe3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25NikmelnikoviteCa12(Fe2+Fe3+3Al3◻)[SiO4]6[◻(OH)4]5◻4Trig. 3 : R3
9.AD.25HutcheoniteCa3Ti2(SiO4)(AlO4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.25Wadalite(Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3Iso. 43m : I43d
9.AD.25RubiniteCa3Ti3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25KerimasiteCa3Zr2(SiO4)(Fe3+O4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.25HoltstamiteCa3Al2(SiO4)2[◻(OH)4]Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AD.25SpessartineMn2+3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25ToturiteCa3Sn2(SiO4)(Fe3+O4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.25KimzeyiteCa3Zr2(SiO4)(AlO4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.25'Khoharite'Mg3Fe3+2(SiO4)3
9.AD.25IrinarassiteCa3Sn2(SiO4)(AlO4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.25KnorringiteMg3Cr3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25GoldmaniteCa3V3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25'Blythite'Mn2+3Mn3+2[SiO4]3
9.AD.25'Skiagite'Fe2+3Fe3+2[SiO4]3
9.AD.25'UM1984-37-SiO:CrMn'Mn2+3Cr3+2(SiO4)3
9.AD.25AlmandineFe2+3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25 va'Yamatoite'(Mn2+,Ca)3(V3+,Al)2(SiO4)3Iso.
9.AD.25GrossularCa3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25AndraditeCa3Fe3+2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25MorimotoiteCa3(TiFe2+)(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25MajoriteMg3(MgSi)(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25PyropeMg3Al2(SiO4)3Iso. m3m(4/m32/m) : Ia3d
9.AD.25SchorlomiteCa3Ti2(SiO4)(Fe3+O4)2Iso. m3m(4/m32/m) : Ia3d
9.AD.30HafnonHf(SiO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
9.AD.30ZirconZr(SiO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
9.AD.30CoffiniteU(SiO4) · nH2OTet. 4/mmm(4/m2/m2/m) : I41/amd
9.AD.30ThoriteTh(SiO4)Tet. 4/mmm(4/m2/m2/m) : I41/amd
9.AD.30 va'Auerlite'near Th(Si,P)O4
9.AD.30Stetindite-(Ce)Ce4+SiO4Tet. 4/mmm(4/m2/m2/m) : I41/amd
9.AD.35'Tombarthite-(Y)'Y4(Si,H4)4O12-x(OH)4+2xMon.
9.AD.35HuttoniteThSiO4Mon. 2/m : P21/c
9.AD.40EulytineBi4(SiO4)3Iso. 43m : I43d
9.AD.45ReiditeZr(SiO4)Tet. 4/m : I41/a
9.AD.55JeffbeniteMg3Al2Si3O12Tet. 42m : I42d

Other InformationHide

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 MomoiiteHide

References for MomoiiteHide

Localities for MomoiiteHide

Showing 5 localities.

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.
Hide all sections | Show all sections

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Japan (TL)
 
  • Ehime Prefecture
    • Saijo City
Tanaka et al. (2010)
  • Fukui Prefecture
    • Mikatakaminaka District
      • Wakasa-cho
Tanaka et al. (2010) +1 other reference
  • Iwate Prefecture
    • Shimohei District
      • Tanohata
Matsubara et al. (2008) +1 other reference
Matsubara et al. (2010)
  • Kyoto Prefecture
    • Kizugawa City
Tanaka et al. (2010)
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