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Epidote Group

Big Photo

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

Show Epidote Group Photos (3)
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: large, high-coordination cations such as Ca, Sr or lanthanides
M sites: octahedrally-coordinated, trivalent (occasionally divalent) cations such as Al 3+, Fe 3+, Mn 3+, Fe 2+ and Mg 2+.

NOTE: Significant CNMMN-approved changes to the nomenclature and content of this group, with the establishment of 3 new sub-groups (European Journal of Mineralogy, 18, 551-567).

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 Related to Group:
:
{CaCe}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaLa}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaY}{Al
 
2
Fe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{Ca
 
2
}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
CaSrAl
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
:
{Ca
 
2
}{Al
 
2
Fe
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaPb}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaCe}{Fe
3+
 
AlFe
2+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaSr}{Mn
3+
 
AlMn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{Ca
 
2
}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{CaSr}{Al
 
2
Mn
3+
 
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
:
{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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  • Search for Epidote Group at Thames Valley Minerals
  • Buy Fine Minerals from mineralsweb.com
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  • Rare and Unusual minerals at Mineralogical Research Company
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    Localities for Epidote Group

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    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.
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    (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.
    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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