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Allanite-(Ce)

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Formula:
{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
Colour:
Brown to black
Lustre:
Vitreous, Resinous
Hardness:
5½ - 6
Specific Gravity:
3.5 - 4.2
Crystal System:
Monoclinic
Name:
Named in 1810 by Thomas Thomson for Thomas Allan (1777-1833), Scottish mineralogist, who first observed the mineral.
The Levinson rule suffix, -(Ce), was later added to designate this species as the Ce-dominant member among all allanites.
Allanite Group of the Epidote Supergroup.
Often forms solid solutions with epidote. May also exist in a solid solution with CaCeAl2(Fe3+2/31/3)[Si2O7][SiO4]O(OH) phase (Guastoni et al., 2017).

Beryllium-rich varieties are known from the Polish Karkonosze Mts.

Compare UM1989-32-SiO:AlCaFeHREE.


Hide all sections | Show all sections

Classification of Allanite-(Ce)Hide

Approved, 'Grandfathered' (first described prior to 1959)
Notes:
Renamed by the IMA
First Published:
1812
Approval History:
Renamed as allanite-(Ce) by IMA in 1987.
9.BG.05b

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Dana 7th ed.:
58.2.1.1
58.2.1a.1

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.13.5

16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths

Physical Properties of Allanite-(Ce)Hide

Vitreous, Resinous
Transparency:
Translucent, Opaque
Colour:
Brown to black
Comment:
brown or green in thin section
Streak:
Brown, greyish
Hardness:
5½ - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Imperfect on {001} ; poor on {100} and {110}
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.5 - 4.2 g/cm3 (Measured)    4.11 g/cm3 (Calculated)

Optical Data of Allanite-(Ce)Hide

Type:
Biaxial (-)
RI values:
nα = 1.715 - 1.791 nβ = 1.718 - 1.815 nγ = 1.733 - 1.822
2V:
Measured: 40° to 80°, Calculated: 50° to 56°
Max Birefringence:
δ = 0.018 - 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
distinct to strong
Comments:
Colours are variable in brown, reddish-brown, yellow, green, and yellow-green
Comments:
Metamict allanites are isotropic with N as low as 1.61.

Chemical Properties of Allanite-(Ce)Hide

Formula:
{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
IMA Formula:
CaCeAl2Fe2+(Si2O7)(SiO4)O(OH)

Crystallography of Allanite-(Ce)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.927 Å, b = 5.761 Å, c = 10.15 Å
β = 114.77°
Ratio:
a:b:c = 1.55 : 1 : 1.762
Unit Cell V:
473.97 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals tabular parallel to {100}, or prismatic to acicular parallel to [010] , to 90 cm; granular, massive.
Twinning:
Polysynthetic, common on {100} .

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Allanite-(Ce)Hide

Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark, 5, 6; The Natural History Museum, London, England, 94377.

Synonyms of Allanite-(Ce)Hide

Other Language Names for Allanite-(Ce)Hide

Simplified Chinese:铈褐帘石
Spanish:Cerorthita

Varieties of Allanite-(Ce)Hide

Bagrationite (of Koksharov)Morphological variety of dipyramidal Allanite-(Ce) close to Bucklandite (of Hermann). The first description of the variety was made by N.I. Koksharov in 1847 from Akhmatovskaya Kop' (Southern Ural).
Chromian Allanite-(Ce)Variety of Allanite-(Ce) with content of Cr2O3 up to 7.5 mass%.
Gallian Allanite-(Ce)A unique Ga-rich variety, surrounding cores of Unnamed (Ga-dominant member of the epidote group). Contains up to 11 wt.% Ga2O3.

Relationship of Allanite-(Ce) to other SpeciesHide

Other Members of this group:
Allanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Allanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
Androsite-(Ce){Mn2+REE}{AlAlMn2+}(SiO4)(Si2O7)O(OH)
Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Ferriakasakaite-(La){CaLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Ferriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Ferriandrosite-(Ce){Mn2+REE}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH)
Ferriandrosite-(La){MnLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Manganiakasakaite-(La)CaLaMn3+AlMn2+(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Manganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon.
Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
UM1989-32-SiO:AlCaFeHREE(Ca0.50.5)(Ce,La,Nd)Fe3+Al2(Si2O7)(SiO4)O(OH)
Unnamed (Ce- and Mn-analogue of Ferriakasakaite-(La)){Ca,(Ce,La,Nd),Mn2+}2(Mn3+,Fe3+,Al)Al(Mn2+,Mg)(Si2O7)(SiO4)O(OH)
Unnamed (Mg-analogue of Ferriallanite-(Ce)){CaCe}{(Fe3+,Al)Al(Mg,Fe2+)}(Si2O7)(SiO4)O(OH)
Unnamed (Mn-analogue of Ferriallanite-(Ce)){CaCe}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)
Vanadoallanite-(La){CaLa}{V3+AlFe2+}(Si2O7)(SiO4)O(OH) Mon. 2/m : P21/m
Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m

Common AssociatesHide

Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
FluoriteCaF2
MuscoviteKAl2(AlSi3O10)(OH)2
Associated Minerals Based on Photo Data:
Titanite29 photos of Allanite-(Ce) associated with Titanite on mindat.org.
Quartz25 photos of Allanite-(Ce) associated with Quartz on mindat.org.
Bastnäsite-(Ce)21 photos of Allanite-(Ce) associated with Bastnäsite-(Ce) on mindat.org.
Yttrofluorite19 photos of Allanite-(Ce) associated with Yttrofluorite on mindat.org.
Calcite18 photos of Allanite-(Ce) associated with Calcite on mindat.org.
Dolomite14 photos of Allanite-(Ce) associated with Dolomite on mindat.org.
Fluorbritholite-(Ce)12 photos of Allanite-(Ce) associated with Fluorbritholite-(Ce) on mindat.org.
Diopside12 photos of Allanite-(Ce) associated with Diopside on mindat.org.
Zircon11 photos of Allanite-(Ce) associated with Zircon on mindat.org.
Clinochlore10 photos of Allanite-(Ce) associated with Clinochlore on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BG.XCyprineCa19Cu2+(Al10Mg2)Si18O68(OH)10Tet. 4/m : P4/n
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2Mon. 2/m : P21/m
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2OMon.
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20ShuiskiteCa2MgCr2(Si2O7)(SiO4)(OH)2 · 2H2OMon.
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)O(OH) · H2OMon.
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2OMon.
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10Tet.
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m)
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2Mon. 2/m : P21/b
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si2O15(OH)2FMon. 2/m : P21/m

Related Minerals - Dana Grouping (8th Ed.)Hide

58.2.1a.2Allanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.3Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.4Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.5Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.6Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
58.2.1a.7Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.8Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.9Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
58.2.1a.10Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
58.2.1a.11Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
58.2.1a.12Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.13.1Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
16.13.2Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)
16.13.3Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
16.13.4Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
16.13.6Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
16.13.8Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m

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 Allanite-(Ce)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Thomson, T. (1810) Experiments on allanite, a new mineral from Greenland. Transactions of the Royal Society of Edinburgh: 8: 371-386.
Marble, J.P. (1940) Allanite from Barringer Hill, Llano County, Texas. American Mineralogist: 25: 168-173.
Hutton, C.O. (1951) Allanite from Yosemite National Park, Tuolumne Co., California. American Mineralogist: 36: 233-248.
Hutton, C.O. (1951) Allanite from Wilmot Pass, Fiordland, New Zealand. American Journal of Science: 249: 208-214.
Hasegawa, S. (1957) Chemical studies of allanites and their associated minerals from the pegmatites in the northern part of the Abukuma massif. Science Reports, Tohoku University, Series 3, Mineralogy, Petrology, and Economic Geology: 5: 345-371.
Hasegawa, S. (1958) Chemical studies of allanites from the new localities in Fukushima and Kagawa prefectures. Science Reports, Tohoku University, Ser. 3, Mineralogy, Petrology, and Economic Geology: 6: 39-56.
Hugo, P.J. (1961) The allanite deposits on Vreda Gordonia district, Cape Province. South Africa Geological Survey, "Geological Series" of the Department of Mines: 37: 1-65.
Frondel, Judith W. (1964) Variation in some rare earths in allanite. American Mineralogist: 49: 1159-1177.
Dollase, W.A. (1971) Refinement of the crystal structures of epidote, allanite and hancockite. American Mineralogist: 56: 447-464.
Fleischer, M. (1985) A summary of the variations in relative abundance of the lanthanides and yttrium in allanites and epidotes. Bulletin of Geological Society of Finland: 57: 151-155.
Deer, W.A., Howie, R.A., Zussman, J. (1986) Rock-forming Minerals, Vol. 1b, 2nd Edition, Disilicates and Ring Silicates. Longman Group U.K., 629 pages.
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
Pan Y., Fleet, M.E. (1990) Halogen-bearing allanite from the White River gold occurrence, Hemlo Area, Ontario. The Canadian Mineralogist: 28: 67-75.
Pan, Y., Fleet, M.E. (1991) Vanadian allanite-(Ce) and vanadian allanite-(La) from the Hemlo gold deposit, Ontario, Canada. Mineralogical Magazine: 55: 497-507.
Peterson, R.C., MacFarlane, D.B. (1993) The rare-earthelement chemistry of allanite from the Grenville Province. The Canadian Mineralogist: 31: 159-166.
Bideaux, et.al. (1995) The Handbook of Mineralogy: Volume 2 - Silicates, Mineral Data Publishing.
Petrík, I., Broska, I., Lipka, J., Siman, P. (1995) Granitoid alanite-(Ce): substitution relations redox conditions and REE distributions (on an example of I-type granitoids, western Carpathians, Slovakia). Geol. Carpathica: 46: 79-94.
Gaines, Richard V., H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, Abraham Rosenzweig, Vandall King (1997), Dana's New Mineralogy : The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, 8th. edition.
Wood, S.A., Ricketts, A. (2000) Allanite-(Ce) from the Eocene Casto granite, Idaho: response to hydrothermal alteration. The Canadian Mineralogist: 38: 81-100.
Ercit, T.S. (2002) The mess that is “allanite”. The Canadian Mineralogist: 40: 1411-1419.
Hoshino, M., Kimata, M., Shimizu, M., Nishida, N., Fujiwara, T. (2006) Allanite-(Ce) in granitic rocks from Japan: genetic implications of patterns of REE and Mn enrichment. The Canadian Mineralogist: 44(1): 45-62.
Armbruster, T., Bonazzi, P., Akasaka, M., Bermanec, V., Chopin, C., Gieré R., Heuss-Assbichler, S., Liebscher, A., Menchetti, S., Pan, Y., Pasero, M. (2006) Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy: 18: 551-567.
Čobić, A., Bermanec, V., Tomašić, N., Škoda, R. (2010): The hydrothermal recrystallization of metamict allanite-(Ce). Can. Mineral. 48, 513-521.
Guastoni, A., Nestola, F., Schiazza, M. (2017) Post-magmatic solid solutions of CaCeAl2(Fe3+2/31/3)[Si2O7][SiO4]O(OH), allanite-(Ce) and REE-bearing epidote in miarolitic pegmatites of Permian Baveno granite (Verbania, central-southern alps, Italy). Mineralogy and Petrology: 111: 315–323

Internet Links for Allanite-(Ce)Hide

Localities for Allanite-(Ce)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 ListShow

Mineral and/or Locality  
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