Gerenite-(Y)
A valid IMA mineral species
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About Gerenite-(Y)
Richard Geren
Formula:
(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
Colour:
white to transparent
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
3.46 (Calculated)
Crystal System:
Triclinic
Name:
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).
Unique Identifiers
Mindat ID:
6969
Long-form identifier:
mindat:1:1:6969:0
Similar Names
| Garronita | A synonym of Garronite-Ca |
| Garronite | A synonym of Garronite Subgroup |
| Jurinite | A synonym of Brookite |
IMA Classification of Gerenite-(Y)
Classification of Gerenite-(Y)
9.CJ.45
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
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 for Standard |
|---|---|---|
| Gnt-Y | 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 Gerenite-(Y)
Vitreous
Transparency:
Translucent
Colour:
White to transparent
Streak:
White
Hardness:
5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Fracture:
Irregular/Uneven
Density:
3.46 g/cm3 (Calculated)
Optical Data of Gerenite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.602(1) nβ = 1.607(2) nγ = 1.611(1)
2V:
Measured: 73° (3), Calculated: 83°
Max. Birefringence:
δ = 0.009
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
very weak
Optical Extinction:
X ∧ b = 7°.
Pleochroism:
Non-pleochroic
Chemistry of Gerenite-(Y)
Mindat Formula:
(Ca,Na)2(Y,REE)3Si6O18 · 2H2O
Element Weights:
Crystallography of Gerenite-(Y)
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
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)°
α = 97.36(3)°, β = 100.52(3)°, γ = 116.57(3)°
Ratio:
a:b:c = 0.958 : 1 : 0.57
Unit Cell V:
423.40 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005545 | Gerenite-(Y) | Groat L A (1998) The crystal structure of gerenite-(Y), (Ca,Na)2(Y,REE)3Si6O18.2H2O, a cyclosilicate mineral The Canadian Mineralogist 36 801-808 |  | 1998 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.44 Å | (80) |
| 8.01 Å | (50) |
| 5.04 Å | (30) |
| 4.51 Å | (50) |
| 4.21 Å | (30) |
| 4.06 Å | (35) |
| 3.76 Å | (70) |
| 3.36 Å | (40) |
| 3.075 Å | (30) |
| 2.973 Å | (100) |
| 2.930 Å | (60) |
| 2.532 Å | (30) |
| 2.203 Å | (40) |
Comments:
Strange Lake complex, Canada. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Gerenite-(Y)
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)
Other Language Names for Gerenite-(Y)
Common Associates
Associations Based on Photo Data:
| 3 photos of Gerenite-(Y) associated with 'Unnamed (HBU UK-6)' | Ca(Y,REE)3Si2O7F4(OH) |
Related Minerals - Strunz-mindat Grouping
| 9.CJ. | Zolotarevite | Na5Zr[Si6O15(OH)3] · 3H2O |
| 9.CJ. | 'Avdeevite' | NaAl4(Be5Li)(Si6O18)2(H2O)1-2 |
| 9.CJ. | 'Beryllocordierite-Na' | NaMg4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Sachanbińskiite | NaMn4(Al5Be)(AlSi5O18)2 · 2H2O |
| 9.CJ. | Nakkaalaaqite | K2[Na3Ca]LiCa2Ti2Be4Si12O38 |
| 9.CJ.05 | Johnkoivulaite-(Cs) | Cs[Be2B]Mg2Si6O18 |
| 9.CJ.05 | Beryl | Be3Al2(Si6O18) |
| 9.CJ.05 | Bazzite | Be3Sc2(Si6O18) |
| 9.CJ.05 | Ferroindialite | (Fe2+,Mg)2Al4Si5O18 |
| 9.CJ.05 va | 'Vorobyevite' | Be3Al2(Si6O18) |
| 9.CJ.05 | Stoppaniite | Be3Fe3+2(Si6O18) · H2O |
| 9.CJ.05 | Indialite | Mg2Al3(AlSi5O18) |
| 9.CJ.10 | Sekaninaite | Fe2+2Al4Si5O18 |
| 9.CJ.10 | Cordierite | Mg2Al4Si5O18 |
| 9.CJ.15a | Zirsinalite | Na6(Ca,Mn2+,Fe2+)Zr(Si6O18) |
| 9.CJ.15a | Kapustinite | Na6ZrSi6O16(OH)2 |
| 9.CJ.15a | Townendite | Na8ZrSi6O18 |
| 9.CJ.15a | Combeite | Na4.5Ca3.5Si6O17.5(OH)0.5 |
| 9.CJ.15a | Kazakovite | Na6Mn2+Ti(Si6O18) |
| 9.CJ.15a | Tisinalite | Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O |
| 9.CJ.15a | Lovozerite | Na2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O |
| 9.CJ.15a | Litvinskite | Na2(◻,Na,Mn)ZrSi6O12(OH,O)6 |
| 9.CJ.15c | Koashvite | Na6(Ca,Mn)(Ti,Fe)Si6O18 · H2O |
| 9.CJ.15b | Imandrite | Na12Ca3Fe3+2(Si6O18)2 |
| 9.CJ.25 | Baratovite | KCa7(Ti,Zr)2Li3Si12O36F2 |
| 9.CJ.25 | Aleksandrovite | KCa7Sn2Li3Si12O36F2 |
| 9.CJ.25 | Katayamalite | KLi3Ca7Ti2(SiO3)12(OH)2 |
| 9.CJ.30 | Dioptase | CuSiO3 · H2O |
| 9.CJ.35 | Kostylevite | K2Zr(Si3O9) · H2O |
| 9.CJ.40 | Petarasite | Na5Zr2(Si6O18)(Cl,OH) · 2H2O |
| 9.CJ.50 | Odintsovite | K2Na4Ca3Ti2Be4Si12O38 |
| 9.CJ.55 | Mathewrogersite | Pb7FeAl3GeSi12O36(OH,H2O)6 |
| 9.CJ.60 | Pezzottaite-(Cs) | Cs(Be2Li)Al2(Si6O18) |
Fluorescence of Gerenite-(Y)
None
Other Information
Notes:
Slowly soluble in HCl and HNO3 at room temperature.
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 Gerenite-(Y)
mindat.org URL:
https://www.mindat.org/min-6969.html
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References for Gerenite-(Y)
Reference List:
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. The Canadian Mineralogist, 36 (3) 793-800
Localities for Gerenite-(Y)
Showing 2 localities.
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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.
Canada (TL) | |
| Birkett et al. (1992) +3 other references | |
Mongolia | |
| Pavel M. Kartashov (n.d.) +1 other reference |
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Khaldzan Buragtag massif, Myangad District, Khovd Province, Mongolia