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About Iimoriite-(Y)Hide

Satoyasu Iimori and Takeo Iimori
Buff-tan, light purplish gray
Vitreous, Resinous
5½ - 6
Specific Gravity:
Crystal System:
Named iimoriite by A. Kato and K. Nagashima in 1970 in honor of Satoyasu Iimori (飯盛里安)(19 October 1885, Kanazawa, Ishikawa Prefecture, Japan - 13 October 1982, Japan) and Takeo Iimori (飯盛武夫)( - 16 August 1942), Japanese chemists who first described many rare earth minerals from the Fusamata pegmatite district. The suffix was added in 1985.
Slight reaction with cold HCl.

Classification of Iimoriite-(Y)Hide

Approval Year:
First Published:

9 : SILICATES (Germanates)
A : Nesosilicates
H : Nesosilicates with CO3, SO4, PO4, etc.

53 : NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
1 : Insular SiO4 Groups and Other Anions of Complex Cations with (CO3)

17 : Silicates Containing other Anions
4 : Silicates with carbonates

Physical Properties of Iimoriite-(Y)Hide

Vitreous, Resinous
Buff-tan, light purplish gray
Colourless in thin section (TL)
White with purplish gray-tint
5½ - 6 on Mohs scale
4.47 g/cm3 (Measured)    4.36 g/cm3 (Calculated)

Optical Data of Iimoriite-(Y)Hide

Biaxial (-)
RI values:
nα = 1.753 nβ = 1.824 nγ = 1.830
Measured: 31° , Calculated: 30°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
distinct to strong

Chemical Properties of Iimoriite-(Y)Hide

IMA Formula:

Crystallography of Iimoriite-(Y)Hide

Crystal System:
Cell Parameters:
a = 6.573 Å, b = 6.651 Å, c = 6.454 Å
α = 116.44°, β = 92.34°, γ = 95.63°
a:b:c = 0.988 : 1 : 0.97
Unit Cell V:
250.3 ų

Occurrences of Iimoriite-(Y)Hide

Paragenetic Mode(s):

Type Occurrence of Iimoriite-(Y)Hide

General Appearance of Type Material:
As masses up to 3 x 3 x 2 cm in size

Geological Setting of Type Material:
Associated Minerals at Type Locality:
Kato, A., Nagashima, K. (1970) Iimoriite (Y,Ca,Zr)15(Mg,Fe3+,Al)(Si,Al,P)9O34(OH)16 in: Introduction to Japanese minerals, Geological Survey of Japan: 39: 85-86.

Synonyms of Iimoriite-(Y)Hide

Other Language Names for Iimoriite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tengerite-(Y)5 photos of Iimoriite-(Y) associated with Tengerite-(Y) on mindat.org.
Allanite-(Nd)4 photos of Iimoriite-(Y) associated with Allanite-(Nd) on mindat.org.
Dolomite3 photos of Iimoriite-(Y) associated with Dolomite on mindat.org.
Keiviite-(Y)3 photos of Iimoriite-(Y) associated with Keiviite-(Y) on mindat.org.
Allanite-(Y)2 photos of Iimoriite-(Y) associated with Allanite-(Y) on mindat.org.
Thalénite-(Y)1 photo of Iimoriite-(Y) associated with Thalénite-(Y) on mindat.org.
Quartz1 photo of Iimoriite-(Y) associated with Quartz on mindat.org.
Allanite-(Ce)1 photo of Iimoriite-(Y) associated with Allanite-(Ce) on mindat.org.
Pyrite1 photo of Iimoriite-(Y) associated with Pyrite on mindat.org.
Yttrofluorite1 photo of Iimoriite-(Y) associated with Yttrofluorite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AH.10Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2Tric. 1 : P1
9.AH.20TernesiteCa5(SiO4)2(SO4)Orth. mmm (2/m 2/m 2/m) : Pnma
9.AH.25Britholite-(Ce)(Ce,Ca)5(SiO4)3OHHex. 6/m : P63/m
9.AH.25Britholite-(Y)(Y,Ca)5(SiO4)3OHHex. 6/m : P63/m
9.AH.25ChlorellestaditeCa5(SiO4)1.5(SO4)1.5ClHex. 6/m : P63/m
9.AH.25Fluorbritholite-(Ce)(Ce,Ca)5(SiO4)3FHex. 6/m : P63/m
9.AH.25HydroxylellestaditeCa5(SiO4)1.5(SO4)1.5(OH)Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm
9.AH.25MattheddleitePb5(SiO4)1.5(SO4)1.5(Cl,OH)Hex. 6/m : P63/m
9.AH.25Fluorcalciobritholite(Ca,REE)5(SiO4,PO4)3FHex. 6/m : P63/m
9.AH.25Fluorbritholite-(Y)(Y,Ca)5(SiO4)3FHex. 6/m : P63/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.4.4ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m
17.4.5FukaliteCa4[Si2O6][CO3](OH)2Mon. 2/m : P21/b
17.4.6MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
17.4.7Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
17.4.8CarletoniteKNa4Ca4Si8O18(CO3)4(OH,F) · H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mbm
17.4.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2OOrth. mmm (2/m 2/m 2/m)
17.4.11Caysichite-(Y)Ca2Y2Si4O10(CO3)3 · 4H2OOrth. mm2
17.4.12Lepersonnite-(Gd)Ca(Gd,Dy)2(UO2)24(SiO4)4(CO3)8(OH)24 · 48H2O
17.4.13AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2OTet.
17.4.15Tundrite-(Ce)Na2Ce2Ti(SiO4)(CO3)2O2Tric. 1 : P1

Fluorescence of Iimoriite-(Y)Hide

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.

References for Iimoriite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kato, A., Nagashima, K. (1970) Iimoriite (Y,Ca,Zr)15(Mg,Fe3+,Al)(Si,Al,P)9O34(OH)16 in: Introduction to Japanese minerals, Geological Survey of Japan: 39: 85-86.
Fleischer, M. (1973) New mineral names. American Mineralogist: 58: 139-141. (abstract)
Foord, E.E., Staatz, M.H., Conklin, N.M. (1984) New data for iimoriite. American Mineralogist: 69: 196-199.
Nickel, E.H., Mandarino, J.A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist: 72: 1031-1042.
Hughes, J.M., Foord, E.E., Jai-Nhuknan, J., Bell, J.M. (1996) The atomic arrangement of iimoriite-(Y), Y2(SiO4)(CO3). The Canadian Mineralogist: 34: 817-820.

Internet Links for Iimoriite-(Y)Hide

Localities for Iimoriite-(Y)Hide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Huambo Province
    • Bailundo City Council
Beleque, A. R. C. (2010). Minerais de ETR no complexo carbonatítico de Bailundo (Mungo, Angola): ocorrência, composição e significado económico.
  • Occitanie
    • Ariège
      • Luzenac
[Le Cahier des Micromonteurs 1990, 4, p.3,8-12]
Japan (TL)
  • Fukushima
    • Kawamata
Kato, A. & Nagashima, K. (1970): Introduction to Japanese Minerals. Geological Survey of Japan, 39: 85-86.
      • Iizaka Village (Iisaka)
Kato, A. & Nagashima, K. (1970): Introduction to Japanese Minerals. Geological Survey of Japan, 39: 85-86.
  • Nordland
    • Tysfjord
      • Drag
Gunnar Raade: Minerals of Norway - the complete inventory. Kongsberg Mineralsymposium 2007, Kongsberg 2007
Husdal, T. (2011): Tysfjordgranittens pegmatitter. Stein. 38 (4): 4-35
  • Murmansk Oblast
    • Keivy Mountains
      • Western Keivy Massif
Voloshin A.V., Pakhomovskii Ya.A. [Волошин А.В., Пахомовский Я.А.] (1987): Iimoriite from amazonite pegmatites of the Kola Peninsula (first find in USSR) [Ииморит из амазонитовых пегматитов Кольского полуострова (первая находка в СССР)]. In: Belkov I.V. (Ed.), Mineralogical associations and minerals in the magmatic complexes of the Kola Peninsula [Белков И.В. (ред.), Минеральные ассоциации и минералы магматических комплексов Кольского полуострова]. Kola Branch, USSR Academy of Science Press [Изд. КолФАН СССР], Apatity, pages 34-42 (in Russian).
  • Värmland County
    • Filipstad
      • Persberg district
Kristiansen, Roy (1993): Thalenitt-liknende mineraler fra Åskagen, Sverige. STEIN 20 (19), 7-8 + 58-60
  • Alaska
    • Prince of Wales-Hyder Census Area
      • Ketchikan District
        • Prince of Wales Island
          • Bokan Mountain
Foord, E.E., Staatz, M.H., and Conklin, N.M. (1984) New data for iimoriite. American Mineralogist: 69: 196-199.
Mineral and/or Locality  
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