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Allanite Group

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Thomas Allan
Formula:
{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Name:
Named in 1810 by Thomas Thomson for Thomas Allan (1777, Edinburgh, Scotland - 1833, Morpeth, Northumberland, England), Scottish banker and mineralogist, who first observed the mineral.

Individual REE members were later distinguished by adding the -(Ce), -(La) etc. suffix.

The allanite group was defined by Armbruster (2006).
A group of the Epidote Supergroup.

Members of this subgroup are REE-rich minerals typified by the eponymous mineral allanite.
This subgroup may be derived from clinozoisite by homovalent substitutions and one coupled heterovalent substitution of the type A2(REE)3+ + M3M2+A2Ca2+ + M3M3+.

The valences on the key sites are: A1 = M2+, A2 = M3+, M1 = M3+, M2 = M3+, M3 = M2+, O4 = O2-, O10 = (OH)- (Armbruster et al., 2006).


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Classification of Allanite GroupHide

Notes:
Group Name
First Published:
2006

Chemical Properties of Allanite GroupHide

Formula:
{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)

Synonyms of Allanite GroupHide

Other Language Names for Allanite GroupHide

Relationship of Allanite Group to other SpeciesHide

Other Members of this group:
Åskagenite GroupA group in the epidote supergroup with a general formula ...
Clinozoisite GroupA group of the Epidote Supergroup.
Dollaseite GroupMembers of the dollaseite group are "REE-rich minerals typified by the eponymous mineral “dollaseite”.
Group Members:
Allanite-(Ce) {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
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

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 GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Janeczek, J., Eby, R.K. (1993) Annealing of radiation damage in allanite and gadolinite. Physics and Chemistry of Minerals: 19: 343-356.
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.
Mills, S.J., Hatert, F., Nickel, E. H., Ferraris, G. (2009) The standardisation of mineral group hierarchies: application to recent nomenclature proposals. European Journal of Mineralogy: 21: 1073–1080.

Internet Links for Allanite GroupHide

Localities for Allanite GroupHide

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