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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.
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.

Classification of Allanite-(Ce)

Approved, 'Grandfathered' (first described prior to 1959)
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
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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.

Occurrences of Allanite-(Ce)

Geological Setting:
A common accessory mineral in many igneous rocks, particularly those that are felsic, and metamorphosed igneous rocks. Also in pegmatites, skarns, and tactites. Not common in volcanic rocks. A detrital mineral.

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)

Crystallography of Allanite-(Ce)

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.927Å, b = 5.761Å, c = 10.15Å
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.

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)

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

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

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)CaLaFe3+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)MnLaFe3+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)
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.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2
9.BG.10Zoisite{Ca2}{Al3}(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+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20ShuiskiteCa2MgCr2(Si2O7)(SiO4)(OH)2 · 2H2O
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe23+(Si2O7)(SiO4)O(OH) · H2O
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Julgoldite-(Mg)Ca2MgFe23+(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6(Si2O7)(SiO4)(OH)2
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2
9.BG.55Västmanlandite-(Ce)Ca(Ce,La)3Al2Mg2(Si2O7)(SiO4)3(OH)2F
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)
16.13.6Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
16.13.8Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
58.2.1.4Clinozoisite{Ca2}{Al3}(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, Serioes 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, J.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.

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, et.al. (1997) Dana's New Mineralogy, 8th Edition, John Wiley & Sons, New York.

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.

Internet Links for Allanite-(Ce)

Localities for Allanite-(Ce)

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.
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