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Epidote Group

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Bethel, Fairfield Co., Connecticut, USA
© 2005 Peter Cristofono

Show Epidote Group Photos (5)
Formula:
{A
 
2
}{M
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
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, Sr or lanthanides
M sites (M1, M2, M3): octahedrally-coordinated, trivalent (occasionally divalent) cations such as Al3+, Fe3+, Mn3+, Fe2+ and Mg2+.

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

Formula:
{A
 
2
}{M
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]

Relationship of Epidote Group to other Species

Minerals in Group:
Allanite-(Ce):
{CaCe}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Allanite-(La):
{CaLa}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Allanite-(Y):
{CaY}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Clinozoisite:
{Ca
 
2
}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Clinozoisite-(Sr):
CaSrAl
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Dissakisite-(Ce):
{CaCe}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Dissakisite-(La):
{CaLa}{Al
 
2
Mg}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Dollaseite-(Ce):
{CaCe}{MgAlMg}[F|OH|SiO
 
4
|Si
 
2
O
 
7
]
Epidote:
{Ca
 
2
}{Al
 
2
Fe
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Epidote-(Pb):
{CaPb}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Ferriallanite-(Ce):
{CaCe}{Fe
3+
 
AlFe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Khristovite-(Ce):
{CaCe}{MgAlMn
2+
 
}[F|OH|SiO
 
4
|Si
 
2
O
 
7
]
Manganiandrosite-(Ce):
(Mn
2+
 
,Ca)(Ce,REE)Mn
3+
 
AlMn
2+
 
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
Manganiandrosite-(La):
{LaMn
2+
 
}{Mn
3+
 
AlMn
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Manganipiemontite-(Sr):
{CaSr}{Mn
3+
 
AlMn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Mukhinite:
{Ca
 
2
}{Al
 
2
V
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Piemontite:
{Ca
 
2
}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Piemontite-(Sr):
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Uedaite-(Ce):
Mn
2+
 
CeAl
 
2
Fe
2+
 
[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Unnamed (Ca-analogue of Manganiandrosite-(La)):
{Ca,(La,Ce,Nd),Mn
2+
 
}
 
2
(Mn
3+
 
,Fe
3+
 
,Al)Al(Mn
2+
 
,Mg)(Si
 
2
O
 
7
){(Si,Al,As)O
 
4
}O(OH)
Unnamed (Mg-analogue of Ferriallanite-(Ce)):
{CaCe}{(Fe
3+
 
,Al)Al(Mg,Fe
2+
 
)}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Unnamed (Mn-analogue of Ferriallanite-(Ce)):
{CaCe}{Fe
3+
 
AlMn
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Vanadoandrosite-(Ce):
{Mn
2+
 
Ce}{V
3+
 
AlMn
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
Zoisite:
{Ca
 
2
}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]

Other Information

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

Reference List: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

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    Localities for Epidote Group

    Hide Locality List
    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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Upper Austria
      • Innviertel
        • Sauwald
          • Enzenkirchen
    		Kolitsch, U. et al. (2008)
    Canada
     
    • Québec
      • Estrie
        • Les Sources RCM
          • Asbestos
    		Horváth & Spertini (2008 & 2009)
    Hungary
     
    • Heves Co.
      • Bükk Mts.
        • Szarvaskő
    		Acta Mineralogica-Petrographica, Abstract Series 1, Szeged, 2003
    USA
     
    • Massachusetts
      • Franklin Co.
    		Dana 4:121 (1854)
      • Hampshire Co.
    		Dana 4:479 (1854)
    • New York
      • Hamilton Co.
        • Long Lake
    		MinRec Sep/Oct 2000
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 8th Nov 2009 12:53:13