Momoiite
A valid IMA mineral species
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About Momoiite
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
Member of:
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.
Type Locality:
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.
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 Identifiers
Mindat ID:
39634
Long-form identifier:
mindat:1:1:39634:7
GUID
(UUID V4):
(UUID V4):
e10750b8-b053-41b6-829d-80549974d607
IMA Classification of Momoiite
Classification of Momoiite
9.AD.25
9 : SILICATES (Germanates)
A : Nesosilicates
D : Nesosilicates without additional anions; cations in [6] and/or greater coordination
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
51 : NESOSILICATES Insular SiO4 Groups Only
4 : Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mom | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Momoiite
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 Momoiite
Mindat Formula:
Mn2+3V3+2(SiO4)3
Elements listed:
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 V:
1,695.46 ų (Calculated from Unit Cell)
Comment:
Ia-3d
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
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:
Synonyms of Momoiite
Relationship of Momoiite to other Species
Member of:
Other Members of this group:
| Almandine | Fe2+3Al2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Andradite | Ca3Fe3+2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Blythite | Mn2+3Mn3+2[SiO4]3 | |
| Calderite | Mn2+3Fe3+2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Eringaite | Ca3Sc2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Goldmanite | Ca3V3+2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Grossular | Ca3Al2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Khoharite | Mg3Fe3+2(SiO4)3 | |
| Knorringite | Mg3Cr2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Majorite | Mg3(MgSi)(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Menzerite-(Y) | (Y2Ca)Mg2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Morimotoite | Ca3(TiFe2+)(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Pyrope | Mg3Al2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Skiagite | Fe2+3Fe3+2[SiO4]3 | |
| Spessartine | Mn2+3Al2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
| Uvarovite | Ca3Cr2(SiO4)3 | Iso. m3m (4/m 3 2/m) : Ia3d |
Common Associates
Associated Minerals Based on Photo Data:
| 2 photos of Momoiite associated with Vuorelainenite | Mn2+V3+2O4 |
| 2 photos of Momoiite associated with Tephroite | Mn2+2SiO4 |
Related Minerals - Strunz-mindat Grouping
| 9.AD. | Adrianite | Ca12(Al4Mg3Si7)O32Cl6 |
| 9.AD.05 | Larnite | Ca2SiO4 |
| 9.AD.10 | Calcio-olivine | Ca2SiO4 |
| 9.AD.15 | Merwinite | Ca3Mg(SiO4)2 |
| 9.AD.20 | Bredigite | Ca7Mg(SiO4)4 |
| 9.AD.25 | Andradite | Ca3Fe3+2(SiO4)3 |
| 9.AD.25 | Almandine | Fe2+3Al2(SiO4)3 |
| 9.AD.25 | Calderite | Mn2+3Fe3+2(SiO4)3 |
| 9.AD.25 | Goldmanite | Ca3V3+2(SiO4)3 |
| 9.AD.25 | Grossular | Ca3Al2(SiO4)3 |
| 9.AD.25 | Henritermierite | Ca3Mn3+2(SiO4)2[◻(OH)4] |
| 9.AD.25 | Kimzeyite | Ca3Zr2(SiO4)(AlO4)2 |
| 9.AD.25 | Knorringite | Mg3Cr2(SiO4)3 |
| 9.AD.25 | Majorite | Mg3(MgSi)(SiO4)3 |
| 9.AD.25 | Morimotoite | Ca3(TiFe2+)(SiO4)3 |
| 9.AD.25 | Pyrope | Mg3Al2(SiO4)3 |
| 9.AD.25 | Schorlomite | Ca3Ti2(SiO4)(Fe3+O4)2 |
| 9.AD.25 | Spessartine | Mn2+3Al2(SiO4)3 |
| 9.AD.25 | Uvarovite | Ca3Cr2(SiO4)3 |
| 9.AD.25 | Wadalite | (Ca,Mg)6(Al,Fe3+)4((Si,Al)O4)3O4Cl3 |
| 9.AD.25 va | Hydrougrandite | (Ca,Mg,Fe2+)3(Fe3+,Al)2[(OH)4(SiO4)2] |
| 9.AD.25 va | Yamatoite | (Mn2+,Ca)3(V3+,Al)2(SiO4)3 |
| 9.AD.25 | Holtstamite | Ca3Al2(SiO4)2[◻(OH)4] |
| 9.AD.25 | Khoharite | Mg3Fe3+2(SiO4)3 |
| 9.AD.25 | Kerimasite | Ca3Zr2(SiO4)(Fe3+O4)2 |
| 9.AD.25 | Toturite | Ca3Sn2(SiO4)(Fe3+O4)2 |
| 9.AD.25 | Eringaite | Ca3Sc2(SiO4)3 |
| 9.AD.25 | Irinarassite | Ca3Sn2(SiO4)(AlO4)2 |
| 9.AD.25 | Menzerite-(Y) | (Y2Ca)Mg2(SiO4)3 |
| 9.AD.25 | Eltyubyuite | Ca12Fe3+10Si4O32Cl6 |
| 9.AD.25 | Blythite | Mn2+3Mn3+2[SiO4]3 |
| 9.AD.25 | Skiagite | Fe2+3Fe3+2[SiO4]3 |
| 9.AD.25 | Hutcheonite | Ca3Ti2(SiO4)(AlO4)2 |
| 9.AD.25 | UM1984-37-SiO:CrMn | Mn2+3Cr3+2(SiO4)3 |
| 9.AD.25 | Rubinite | Ca3Ti3+2Si3O12 |
| 9.AD.25 | Nikmelnikovite | Ca12(Fe2+Fe3+3Al3◻)[SiO4]6[◻(OH)4]5◻4 |
| 9.AD.30 va | Auerlite | near Th(Si,P)O4 |
| 9.AD.30 | Coffinite | U(SiO4) · nH2O |
| 9.AD.30 | Hafnon | HfSiO4 |
| 9.AD.30 | Thorite | Th(SiO4) |
| 9.AD.30 | Zircon | Zr(SiO4) |
| 9.AD.30 | Stetindite-(Ce) | Ce(SiO4) |
| 9.AD.35 | Huttonite | ThSiO4 |
| 9.AD.35 | Tombarthite-(Y) | Y4(Si,H4)4O12-x(OH)4+2x |
| 9.AD.40 | Eulytine | Bi4(SiO4)3 |
| 9.AD.45 | Reidite | ZrSiO4 |
| 9.AD.55 | Jeffbenite | Mg3Al2Si3O12 |
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.
Internet Links for Momoiite
mindat.org URL:
https://www.mindat.org/min-39634.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Momoiite
Reference List:
Tanaka, Hidekazu, Endo, Shunsuke, Minakawa, Tetsuo, Enami, Masaki, Nishio-Hamane, Daisuke, Miura, Hiroyuki, Hagiwara, Akihito (2010) Momoiite, (Mn2+,Ca)3(V3+,Al)2Si3O12, a new manganese vanadium garnet from Japan. Journal of Mineralogical and Petrological Sciences, 105 (2) 92-96 doi:10.2465/jmps.091015a
Localities for Momoiite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Tanaka et al. (2010) |
| Tanaka et al. (2010) +1 other reference |
| Matsubara et al. (2008) +1 other reference |
| Matsubara et al. (2010) | |
| Tanaka et al. (2010) |
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Kurase mine, Saijo City, Ehime Prefecture, Japan