Agardite is a mineral group consisting of agardite-(Y),[4][5] agardite-(Ce),[6] agardite-(Nd),[7] and agardite-(La).[8] They comprise a group of minerals that are hydrous hydrated arsenatesofrare-earth elements (REE) and copper, with the general chemical formula (REE,Ca)Cu6(AsO4)3(OH)6·3H2O. Yttrium, cerium, neodymium, lanthanum, as well as trace to minor amounts of other REEs, are present in their structure. Agardite-(Y) is probably the most often found representative.[citation needed] They form needle-like yellow-green (variably hued) crystals in the hexagonalcrystal system. Agardite minerals are a member of the mixite structure group, which has the general chemical formula Cu2+6A(TO4)3(OH)6·3H2O, where A is a REE, Al, Ca, Pb, or Bi, and T is P or As. In addition to the four agardite minerals, the other members of the mixite mineral group are calciopetersite,[9]goudeyite,[10]mixite,[11]petersite-(Ce),[12]petersite-(Y),[13][14]plumboagardite,[15] and zálesíite.[16]
^Dietrich J. E., Orliac M., Permingeat F. (1969) L’agardite, une nouvelle espèce minérale, et le problème du chlorotile, Bulletin de la Société Française de Minéralogie et de Cristallographie 92, 420–434.
^Nickel E. H., Mandarino J. A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature, American Mineralogist 72, 1031–1042.
^Walenta K., Theye T. (2004) Agardite-(Ce) of the Clara mine in the central Black Forest, Aufschluss 55, 17–23.
^Pekov I. V., Chukanov N. V., Zadov A. E., Voudouris P., Magganas A., Katerinopoulos A. (2011) Agardite-(Nd), NdCu6(AsO4)3(OH)6·3H2O, from the Hilarion Mine, Lavrion, Greece: mineral description and chemical relations with other members of the agardite-zálesíite solid-solution system, Journal of Geosciences 57, 249–255.
^Fehr T., Hochleitner R. (1984) Agardite-La. Ein neues mineral von Lavrion, Griechenland, Lapis 9, 22–37.
^Sejkora J., Novotný P., Novák M., Šrein V., Berlepsch P. (2005) Calciopetersite from Domašov nad Bystricí, Northern Moravia, Czech Republic, a new mineral species of the mixite group, The Canadian Mineralogist 43, 1393–1400.
^Wise W. S. (1978) Parnauite and goudeyite, two new copper arsenate minerals from the Majuba Hill Mine, Pershing County, Nevada, American Mineralogist 63, 704–708.
^Williams P. A., Hatert F., Pasero M., Mills S. J. (2014) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 20. New minerals and nomenclature modifications approved in 2014. Mineralogical Magazine 78, 549–558.
^Peacor D. R., Dunn P. J. (1982) Petersite, a REE and phosphate analog of mixite, American Mineralogist 67, 1039–1042.
^Nickel E. H., Mandarino J. A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature, American Mineralogist 72, 1031–1042.
^Walenta K., Theye T. (2005) Plumboagardite, a new mineral of the mixite group from an occurrence in the Southern Black Forest, Neues Jahrbuch für Mineralogie, Abhandlungen 181, 219–224.
^Sejkora J., Rídkošil T., Šrein V. (1999) Zálesíite, a new mineral of the mixite group, from Zálesí, Rychlebské hory Mts., Czech Republic, Neues Jahrbuch für Mineralogie, Abhandlungen 175, 105–124.
^Dietrich J. E., Orliac M., Permingeat F. (1969) L’agardite, une nouvelle espèce minérale, et le problème du chlorotile, Bulletin de la Société Française de Minéralogie et de Cristallographie, 92, 420–434.
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^K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992.
^Sejkora J., Pauliš P., Kopista J.: Agardit-(Y) z ložiska Sn-W Cínovec v Krušných horách (Česká republika). Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 2011, 19, 1, 64–68.
^LAPIS 24 (7/8) 1999; Wendel, W. and Markl, G. (1999) Lavrion: Mineralogische Klassiker und Raritäten für Sammler. LAPIS 24 (7/8): 34–52.
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^Siuda R., K. Gal-Solymos, Kruszewski L., 2006: Agardite-(La)-duftite and scorodite-köttigite-like mineral paragenesis from supergenic zone of the Miedzianka deposit (Rudawy Janowickie Mts., Poland) – preliminary report. Mineralogia Polonica Special Papers, 29, 192–195.
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