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About Gerenite-(Y)Hide

Richard Geren
(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
white to transparent
Specific Gravity:
3.46 (Calculated)
Crystal System:
Named by J.L. Jambor, A.C. Roberts, J.D. Grice, T.C. Birkett, L.A. Groat, and S. Zajac in 1998 in honor of Richard Geren (15 July 1917, Columbus, Ohio, USA - 3 September 2002, Oromocto, New Brunswick, Canada), former executive vice-president of the Iron Ore Company of Canada. He initiated and supported the exploration program of the Strange Lake deposit.
This page provides mineralogical data about Gerenite-(Y).

Classification of Gerenite-(Y)Hide


9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

Physical Properties of Gerenite-(Y)Hide

white to transparent
3.46 g/cm3 (Calculated)

Optical Data of Gerenite-(Y)Hide

Biaxial (-)
RI values:
nα = 1.602(1) nβ = 1.607(2) nγ = 1.611(1)
Measured: 73° (3), Calculated: 83°
Max Birefringence:
δ = 0.009
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
very weak

Chemical Properties of Gerenite-(Y)Hide

(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
IMA Formula:
(Ca,Na,◻)2Y3Si6O18 · 2H2O

Crystallography of Gerenite-(Y)Hide

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
Cell Parameters:
a = 9.275(4) Å, b = 9.684(4) Å, c = 5.520(1) Å
α = 97.36(3)°, β = 100.52(3)°, γ = 116.57(3)°
a:b:c = 0.958 : 1 : 0.57
Unit Cell V:
423.40 ų (Calculated from Unit Cell)

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005545Gerenite-(Y)Groat L A (1998) The crystal structure of gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18.2H2O, a cyclosilicate mineral The Canadian Mineralogist 36 801-80819980293
CIF Raw Data - click here to close

Type Occurrence of Gerenite-(Y)Hide

General Appearance of Type Material:
Intergrowths containing gerenite-(Y) are megascopically recognizable as sparsely disseminated anhedral masses that are typically 1-2 cm across
Place of Conservation of Type Material:
Type specimens, including the holotype (NMCC 67354), are in the Systematic Reference Series housed at the Geological Survey of Canada, Ottawa, as part of the National Mineral Collection of Canada. The single-crystal fragment used
for the X-ray structure determination (Groat 1998) is in the M.Y. Williams Museum at the University of British Columbia, Vancouver.
Associated Minerals at Type Locality:

Synonyms of Gerenite-(Y)Hide

Other Language Names for Gerenite-(Y)Hide

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Gerenite-(Y) associated with Unnamed (HBU UK-6)Ca(Y,REE)3Si2O7F4(OH)

Related Minerals - Nickel-Strunz GroupingHide

9.CJ.Avdeevite(Na,Cs)(Be2Li)Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
9.CJ.05BazziteBe3Sc2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05BerylBe3Al2(Si6O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05IndialiteMg2Al3(AlSi5O18)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.05StoppaniiteBe3Fe3+2(Si6O18) · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)Orth. mmm (2/m 2/m 2/m) : Cccm
9.CJ.15aCombeiteNa4.5Ca3.5Si6O17.5(OH)0.5Trig. 3m (3 2/m) : R3m
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2OOrth.
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2OMon.
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2OTrig.
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6Mon. m : Bm
9.CJ.15aKapustiniteNa6ZrSi6O16(OH)2Mon. 2/m
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2Mon. 2/m : B2/b
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2Mon. 2/m : B2/b
9.CJ.30DioptaseCuSiO3 · H2OTrig. 3 : R3
9.CJ.35KostyleviteK2Zr(Si3O9) · H2OMon.
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2OMon. 2/m : P21/m
9.CJ.60PezzottaiteCs(Be2Li)Al2(Si6O18)Trig. 3 : R3

Fluorescence of Gerenite-(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 Gerenite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Jambor, J.L., Roberts, A.C., Grice, J.D., Birkett, T.C., Groat, L.A., Zajac, S. (1998) Gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18.2H2O, a new mineral species, and an associated Y-bearing gadolinite-group mineral, from the Strange Lake peralkaline complex, Quebec-Labrador. Canadian Mineralogist: 36: 793-800.
Groat, L.A. (1998) The crystal structure of gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18.2H2O, a cyclosilicate mineral. Canadian Mineralogist: 36: 801-808.
Jambor, J.L., Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 990-994

Internet Links for Gerenite-(Y)Hide

Localities for Gerenite-(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.
Canada (TL)
JAMBOR, J.L., ROBERTS, A.C., GRICE, J.D., BIRKETT, T.C., GROAT, L.A. & ZAJAC, S. (1998): Gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18$2H2O, a new mineral species, and an associated Y-bearing gadolinite-group mineral, from the Strange Lake peralkaline complex, QuebecBLabrador. Canadian Mineralogist 36, 793-800. GROAT, L.A. (1998): The crystal structure of gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18$2H2O, a cyclosilicate mineral. Canadian Mineralogist 36, 801-808. ; A. Kerr and H. Rafuse (2012) Rare-earth element (REE) geochemistry of the Strange Lake deposits: Implications for resource estimation and metallogenic models. Newfoundland and Labrador Department of Natural Resources Current Research 2012 pp39-60; BIRKETT, T.C., MILLER, R.R., ROBERTS, A.C., & MARIANO, A.N. (1992) Zirconium bearing minerals from the Strange Lake intrusive complex, Quebec Labrador. Canadian Mineralogist, 30, 191-205.
  • Khovd Province
    • Myangad District
P.M. Kartashov analytical data; Kovalenko, V. I., Yarmolyuk, V. V., Sal nikova, E. B., Kartashov, P. M., Kovach, V. P., Kozakov, I. K., ... & Yakovleva, S. Z. (2004). The Khaldzan-Buregtei Massif of peralkaline rare-metal igneous rocks: structure, geochronology, and geodynamic setting in the Caledonides of Western Mongolia. Petrology c/c of Petrologiia, 12(5), 412-436.
Mineral and/or Locality  
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