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Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
© Rob Lavinsky
|Name:||After the principal member of the group.|
A group of monoclinic sorosilicates with the general formula given above.
A sites (A1, A2): large, high-coordination cations such as Ca, Mn2+, Sr or large REE3+.
M sites (M1, M2, M3): octahedrally-coordinated, trivalent (occasionally divalent) cations such as Al3+, Fe3+, Mn3+, Fe2+ and Mg2+.
The detailed structural formula is A1A2M1M2M3(Si2O7)(SiO4)O(OH).
NOTE: Significant CNMMN-approved changes to the nomenclature and content of this group, with the establishment of 3 new sub-groups were published in 2006 (European Journal of Mineralogy, 18, 551-567). The nomenclature is based on the occupancy of the five A and M sites.
Classification of Epidote Group
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Chemical Properties of Epidote Group
Relationship of Epidote Group to other Species
|Minerals structurally related to group:|
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Epidote Group
Peacor, D.R. and Dunn, P.J. (1988) Dollaseite-(Ce)(magnesium orthite redefined): structure refinement and implications for F + M 2+ substitution in epidote-group minerals. American Mineralogist: 73: 838-842.
Gieré, R. and Sorensen, S.S. (2004) Allanite and other REE-rich epidote-group minerals. In: Epidotes (A. Liebscher & G. Franz, editors). Rev. Mineral. Geochem.: 56: 431-493.
Grapes, R.H. and Hoskin, W.O. (2004) Epidote Group Minerals in Low-Medium Pressure Metamorphic Terranes. Reviews in Mineralogy and Geochemistry: 56(1): 301-345.
Anthony, Edna B., Let's Talk Gemstones, Uncommon Sorosilicate Gemstones, part 3: The Epidote Group. The New Mexico Facetor.
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 Epidote Group
Localities for Epidote Group
The 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.