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Allanite-(Ce)

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Formula:
CaCeAl2Fe2+(Si2O7)(SiO4)O(OH)
System:
Monoclinic
Colour:
Brown to black
Lustre:
Vitreous, Resinous
Hardness:
5½ - 6
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.

Compare UM1989-32-SiO:AlCaFeHREE.

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


Classification of Allanite-(Ce)

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)

Vitreous, Resinous
Diaphaneity (Transparency):
Translucent, Opaque
Colour:
Brown to black
Comment:
brown or green in thin section
Streak:
Brown, greyish
Hardness (Mohs):
5½ - 6
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)

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)

IMA Formula:
CaCeAl2Fe2+(Si2O7)(SiO4)O(OH)
Mindat.org Formula:
{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)

Often slightly radioactive due to minor U and/or Th contents; therefore often metamict.
Elements listed in formula:

Crystallography of Allanite-(Ce)

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 Volume:
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 Diffraction:
Image Loading

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

Occurrences of Allanite-(Ce)

Type Occurrence of Allanite-(Ce)

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

Relationship of Allanite-(Ce) to other Species

Other Members of Group:
Allanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Allanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Androsite-(Ce){Mn2+REE}{AlAlMn2+}(SiO4)(Si2O7)O(OH)
Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
Ferriakasakaite-(La){CaLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)
Ferriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Ferriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
Ferriandrosite-(Ce){Mn2+REE}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH)
Ferriandrosite-(La){MnLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)
Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
Manganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
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 Ferriakasakaite-(La)){CaLa}{Mn3+AlMn2+}(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)
Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
Common Associates:
9.BG.XCyprineCa19Cu2+(Al10Mg2)Si18O68(OH)10
9.BG.05bAllanite-(La)CaLaAl2Fe2+(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y)CaYAl2Fe2+(Si2O7)(SiO4)O(OH)
9.BG.05aClinozoisiteCa2Al3(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce)CaCeMgAl2(Si2O7)(SiO4)O(OH)
9.BG.05Dollaseite-(Ce)CaCeMg2Al(Si2O7)(SiO4)(OH)F
9.BG.05aEpidoteCa2Fe3+Al2(Si2O7)(SiO4)O(OH)
9.BG.05HancockiteCaPbFe3+Al2(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce)CaCeMgMn2+Al(Si2O7)(SiO4)(OH)F
9.BG.05MukhiniteCa2Al2V3+(Si2O7)(SiO4)O(OH)
9.BG.05PiemontiteCa2Mn3+Al2(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr)CaSrMn3+Al2(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La)LaMn22+Mn3+Al(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05TweddilliteCaSrMn23+Al(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce)CaCeFe2+Fe3+Al(SiO4)(Si2O7)O(OH)
9.BG.05NiigataiteCaSrAl3(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce)Mn2+Ce3+AlMn3+Mn2+(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La)CaLaMgAl2(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce)Mn2+CeV3+AlMn2+O(Si2O7)(SiO4)(OH)
9.BG.05Uedaite-(Ce)Mn2+CeAl2Fe2+(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr)CaSrFe3+Al2(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd)CaNdAl2Fe2+(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La)CaLaFe3+AlFe2+(SiO4)(Si2O7)O(OH)
9.BG.05bÅskagenite-(Nd)Mn2+NdAl2Fe3+(Si2O7)(SiO4)O2
9.BG.10ZoisiteCa2Al3(Si2O7)(SiO4)O(OH)
9.BG.15MacfalliteCa2Mn33+(SiO4)(Si2O7)(OH)3
9.BG.15SursassiteMn22+Al3(SiO4)(Si2O7)(OH)3
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2Si3(O,OH)14
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(SiO4)(Si2O7)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)Al2(SiO4)(Si2O7)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(SiO4)(Si2O7)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(SiO4)(Si2O7)(OH)2 · H2O
9.BG.20ShuiskiteCa2MgCr2(SiO4)(Si2O7)(OH)2 · H2O
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe23+(Si2O7)(SiO4)O(OH) · H2O
9.BG.20Pumpellyite-(Al)Ca2Al3(SiO4)(Si2O7)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)V23+(Si,Al)3(O,OH)14
9.BG.20Julgoldite-(Mg)Ca2MgFe23+(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb3Ca2(SiO4)(Si2O7)
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na)19(Al,Mg,Fe)13(SiO4)10(Si2O7)4(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,◻,Al)5(SiO4)10(Si2O7)4(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+Al10Mg2(SiO4)10(Si2O7)4O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg)13(SiO4)10(Si2O7)4O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)Y(Al,Si)(SiO4)(OH,O)2
9.BG.45DellaiteCa6(Si2O7)(SiO4)(OH)2
9.BG.50Gatelite-(Ce)(Ca,Ce)4(Al,Mg,Fe)4(Si2O7)(SiO4)3(O,F,OH)3
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si5O19(OH)2F
16.13.1Vyuntspakhkite-(Y)Y(Al,Si)(SiO4)(OH,O)2
16.13.2Törnebohmite-(Ce)Ce2Al(SiO4)2(OH)
16.13.3Törnebohmite-(La)La2Al(SiO4)2(OH)
16.13.4Allanite-(Y)CaYAl2Fe2+(Si2O7)(SiO4)O(OH)
16.13.6Dollaseite-(Ce)CaCeMg2Al(Si2O7)(SiO4)(OH)F
16.13.8Dissakisite-(Ce)CaCeMgAl2(Si2O7)(SiO4)O(OH)
58.2.1.4ClinozoisiteCa2Al3(Si2O7)(SiO4)O(OH)

Other Names for Allanite-(Ce)

Name in Other Languages:
Simplified Chinese:铈褐帘石
Spanish:Cerorthita

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.

References for Allanite-(Ce)

Reference List:
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.

Internet Links for Allanite-(Ce)

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