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Epidote Group

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About Epidote GroupHide


A group in the Epidote Supergroup.

The name for this group was originally named clinozoisite group by Armbuster et al. 2006), but renamed as epidote group by IMA (proposal 09-A, cfr. Mills et al. 2009) probably because the name "epidote group" was very firmly established in the literature.

This group of the Epidote Supergroup are, follwing Armbuster et al. 2006) derived from the mineral clinozoisite, Ca2Al3[Si2O7][SiO4]O(OH), solely by homovalent substitutions. The key cation and anion sites are A1 = M2+, A2 = M2+, M1 = M3+, M2 = M3+, M3 = M3+,O4 = O2-, O10 = (OH)-.

Classification of Epidote GroupHide

IMA Approved Group Name
Approval History:
IMA Proposal 09A (Armbruster et al. (2006), Mills et al. 2009)

Chemical Properties of Epidote GroupHide


Synonyms of Epidote GroupHide

Relationship of Epidote Group to other SpeciesHide

Other Members of this group:
Allanite Group{A12+REE3+}{M3+2M32+}(Si2O7)(SiO4)O(OH)
Åskagenite Group{A12+A23+M13+M23+M33+}(Si2O7)(SiO4)O2
Dollaseite Group{A12+A23+M12+M23+M32+}(Si2O7)(SiO4)F (OH)
Unnamed (Possible Ca-analogue of androsite-(Ce))CaCeAlAlMn2+(Si2O7)(SiO4)O(OH) or CaCeAlAlMn3+(Si2O7)(SiO4)O(O)
Unnamed (Possible Ca-analogue of androsite-(La))CaLaAlAlMn2+(Si2O7)(SiO4)O(OH) or CaLaAlAlMn3+(Si2O7)(SiO4)O(O)
Unnamed (Possible Cr analogue of ferriallanite-(Ce))CaCeFeCrFe2+(Si2O7)(SiO4)O(OH) or CaCeFeCrFe3+(Si2O7)(SiO4)O(O)
Unnamed (Possible Mn2+ analogue of "ferridissakisite-(La)")CaLaFe3+AlMn2+(Si2O7)(SiO4)O(OH) or CaLaFe3+AlMn3+(Si2O7)(SiO4)O(O)
Unnamed (Possible Mn2+ analogue of "uedaite-(Nd)")Mn2+NdAlAlMn2+(Si62O7)(SiO4)O(OH) or Mn2+NdAlAlMn3+(Si2O7)(SiO4)O(O)
Unnamed (Possible Mn2+ analogue of uedaite-(Ce))Mn2+CeAlAlMn2+(Si2O7)(SiO4)O(OH) or Mn2+CeAlAlMn3+(Si2O7)(SiO4)O(O)
Group Members:
Clinozoisite {Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote-(Sr) {CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Hancockite {CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
Mukhinite {Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
Niigataite {CaSr}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m
Piemontite {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Piemontite-(Pb) {CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH) Mon. 2/m : P21/m
Piemontite-(Sr) {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
Tweddillite {CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Unnamed (Fe3+ analogue of piemontite-(Pb)) CaPbFe3+AlMn3+(Si2O7)(SiO4)O(OH)
Unnamed (Fe3+-analogue of piemontite) CaCaFe3+AlMn3+(Si2O7)(SiO4)(OH,O)2
Unnamed (Ga analogue of epidote) CaCaAlAlGa(Si2O7)(SiO4)O(OH)
Unnamed (Ga-dominant member of the epidote group) {Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH)

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.

Epidote Group in petrologyHide

References for Epidote GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 Epidote GroupHide

Significant localities for Epidote GroupHide

Showing 38 significant localities out of 10,236 recorded on

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 ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Carinthia
    • Saualpe
      • Ladinger Spitze - Speikkogel area
[Epidote] G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995
  • Salzburg
    • Knappenwand area
[Epidote] A. Strasser: Die Minerale Salzburgs, 1989
  • Tyrol
    • East Tyrol
      • Virgen Valley
        • Prägraten
[Clinozoisite] E. Weinschenk: "Die Mineralvorkommen des Großvenedigerstockes in den Hohen Tauern", Zeitschr. Krist. 26, 337-508 (1896)
  • Wallonia
    • Walloon Brabant
      • Rebecq
        • Quenast
[Epidote] Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p.
  • Guayas Province
    • Guayaquil Canton
      • Guayaquil
        • Pascuales
          • La Germania
[Epidote] Alejandro Felix Gutierrez
  • Auvergne-Rhône-Alpes
    • Isère
[Epidote] Haüy (1801a); Raade (1996, p. 33).
  • Réunion
    • Cilaos
[Epidote] Serge Lavarde collection
[Epidote] Serge Lavarde collection
  • Quiché Department
    • Joyabaj Municipality
      • Palibatz
[Epidote] USGS Bulletin 1034
  • Aosta Valley
    • Saint-Marcel
[Piemontite] Das Mohs'sche Mineralsystem; 1853 Wien
  • Liguria
    • Genoa
      • Ne
[Piemontite-(Sr)] Redazionale (2005): Sistematica ligure: resoconto 2005. Notiziario di Mineralogia del Ferrania Club, 19 , 3-5.
[Piemontite-(Sr)] Bonazzi, P., Menchetti, S. & Palenzona, A. (1990): Strontiopiemontite, a new member of the epidote group, from Val Graveglia, Liguria, Italy. European Journal of Mineralogy, 2, 519-523.
  • Tuscany
    • Lucca Province
      • Stazzema
[Piemontite] Battaglia S., Nannoni R., Orlandi P., 1977. La piemontite del Monte Corchia (Alpi Apuane). Atti Soc. Tosc. Sci. Nat., Mem., Serie A, 84: 174-178.
[Piemontite] Biagioni C., 2004. Le mineralizzazioni manganesifere dei Diaspri Auctt. di Vagli (Alpi Apuane, Lucca). Tesina di Laurea inedita, Università di Pisa
[Piemontite] Biagioni C., 2004. Le mineralizzazioni manganesifere dei Diaspri Auctt. di Vagli (Alpi Apuane, Lucca). Tesina di Laurea inedita, Università di Pisa.
  • Kochi
    • Nankoku city
[Epidote-(Sr)] Journal of Mineralogical and Petrological Sciences 103,400-406(2008)
  • Niigata
    • Itoigawa City
      • Ōmi
[Niigataite] Miyajima et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 118-129.
  • Baja California
    • Ensenada Municipality
      • San Fernando
[Epidote] Peninsular Range Collection - Curtis Wilbur, owner
  • Sonora
    • Álamos Municipality
      • Álamos
[Clinozoisite] Panczner, William D. "Minerals of Mexico." New York: Van Nostrand Reinhold 1987. pg 165---(RO Meyer collection, specimen number E024-002)
North Macedonia
  • Prilep
    • Čanište
[Epidote] Bermanec, V., Palinkas, L., Strmić Palinkas, S., Gault, R., Boev, B., & Zebec, V. (2001). Mineralogy of pegmatite with giant epidote crystals, near Chanishte, Macedonia. in Mineral Deposits at the Beginning of the 21st Century, Piestrzyf1ski at al (ads), pp 939-942.; Palinkaš, S. S., Bermanec, V., Palinkaš, L. A., Boev, B., Gault, R. A., Prochaska, W., & Bakker, R. J. (2012). The evolution of the Čanište epidote-bearing pegmatite, Republic of Macedonia: evidence from mineralogical and geochemical features. Geologia Croatica, 65(3), 423-434.
  • Veles
    • Nežilovo
      • Jakupica Mts
        • Babuna Valley
[Piemontite-(Pb)] Chukanov, N. V., Varlamov, D. A., Nestola, F., Belakovskiy, D. I., Goettlicher, J., Britvin, S. N., ... & Jancev, S. (2012). Piemontite-(Pb), CaPbAl2Mn3+ [Si2O7][SiO4] O (OH), a new mineral species of the epidote supergroup. Neues Jahrbuch für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 189(3), 275-286
  • Gilgit-Baltistan
    • Skardu District
      • Haramosh Mts.
[Epidote] []
  • Leiria
    • Óbidos
      • Santa Maria
  • Kemerovo Oblast
    • Gornaya Shoria Region
      • Tashelga River
[Mukhinite] Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
South Africa
  • Mpumalanga
    • Ehlanzeni District
      • Kruger National Park
[Epidote] PMPB Meulenbeld collection
  • Northern Cape
    • Kalahari manganese field
      • Hotazel
[Tweddillite] Mineralogical Magazine(2002) 66, 137-150; Lapis 2002(11), 43
  • Värmland County
    • Filipstad
      • Nordmark district
        • Jakobsberg ore field
[Piemontite] Holtstam, D. & Norrestam, R. (1993): Lindqvistite Pb2MeFe16O27,a novel hexagonal ferrite mineral from Jakobsberg, Filipstad, Sweden. American Mineralogist. 78, 1304-1312
  • Scotland
    • Highland
[Epidote var: Withamite] C. Hintze: "Handbuch der Mineralogie", Vol. 2 (1897) Hutton, C. Osborne, "On the Nature of Withamite from Glen Coe, Scotland", Mineralogical Magazine, vol. 25, no. 162, p 119 - 125, DOI: 10.1180/minmag.1938.025.162.02, 1938.Zealand, pp 119-125, 1938, online:
  • Alaska
    • Prince of Wales-Hyder Census Area
      • Ketchikan Mining District
        • Prince of Wales Island
[Epidote] Min Rec 35:5 pp383-404, 419-420
  • California
    • Calaveras Co.
      • Valley Springs area
[Epidote] Jake Harper: Field work, 1990 - 2110.
  • Connecticut
    • Hartford Co.
      • Glastonbury
        • South Glastonbury
[Epidote] Betts, John. (1999): The Quarries and Minerals of the Dayton Road District, South Glastonbury, Connecticut. Rocks and Minerals. Volume 74, Number 2. pp. 110-121.
    • Middlesex Co.
      • Haddam
[Epidote] Rocks & Minerals (1995) 70:396-409; Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.; Foye, Wilbur G. (1922): Mineral localities in the vicinity of Middletown. American Mineralogist v. 7, p. 4-12.
    • Tolland Co.
      • Coventry
[Epidote] Harvard Mineralogical Museum No. 119199; Former Ed Force collection.
  • Nevada
    • Mineral Co.
      • Hawthorne Mining District (Pamlico Mining District)
[Epidote] MinRec 16:75-80
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
[Hancockite] Frondel, C.: The minerals of Franklin and Sterling Hill - a checklist (1972); Palache(1935):98; Dunn(1995):Pt3:406.
[Hancockite] Penfield, Samuel Lewis and Warren Charles Hyde (1899) Some New Minerals from the Zinc Mines at Franklin, N. J., and Note Concerning the Chemical Composition of Ganomalite, American Journal of Science, third series, v. 8, p. 339-353.; palache (1935)
  • Pennsylvania
    • Chester Co.
      • Wallace Township
        • Cornog
[Clinozoisite] Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania. A. Montgomery "The Mineralogy of Pennsylvania 1922-1965" pgs. 44-45"
  • Vermont
    • Orleans & Lamoille Cos.
      • Lowell & Eden
[Clinozoisite] Chidester, A.H., Albee, A.L., and Cady, W.M., (1978). Petrology, structure and genesis of the asbestos-bearing ultramafic rocks of the Belvidere Mountain area in Vermont: U.S. Geologic Survey Professional Paper 1016
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