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Mixite is a rare copper bismuth arsenate mineral with formula: BiCu6(AsO4)3(OH)6·3(H2O). It crystallizes in the hexagonal crystal system typically occurring as radiating acicular prisms and massive encrustations. The color varies from white to various shades of green and blue. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 3.8. It has an uneven fracture and a brilliant to adamantine luster. It occurs as a secondary mineral in the oxidized zones of copper deposits. Associated minerals include: bismutite, smaltite, native bismuth, atelestite, erythrite, malachite and barite.〔 It was discovered in 1879 near J´achymov, Czech Republic by mine engineer Anton Mixa.〔Schrauf A (1880) Ueber Arsenate von Joachimsthal. 1. Mixit, ein neues Kupferwismuthhydroarsenat, Zeitschrift für Krystallographie und Mineralogie 4, 277-285〕 Mixite has also been found in Argentina,〔Lapis 8(4), 25 (1983).〕 Australia,〔Kolitsch, U. and Elliott, P. (1999): Mineralogy of the Mount Malvern Mine near Clarendon, South Australia. Australian J. Mineral. 5, 3-17.〕 Austria,〔G. Blass, A. Pichler: Carinthia II 191./111.: 43-55 (2001); Kolitsch, 〕 France,〔Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997.〕 Germany,〔Aufschluss 1986(11), 370ff.〕 Greece,〔Voudouris, P. & Economou-Eliopoulus, M. (2003): Mineralogy and chemistry of Cu-rich ores from the Kamariza carbonate-hosted deposit (Lavrion), Greece. In: Eliopoulos et al. (Eds.): Mineral Exploration and Sustainable Development. Millpress, Rotterdam, 1039-1042.〕 Hungary,〔Geoda 2012/I.〕 Italy,〔Piccoli, G.C. (2002): Minerali delle Alpi Marittime e Cozie. Provincia di Cuneo. Amici del Museo "F. Eusebio", Ed., Alba, 366 pp.; Piccoli, G. C., Maletto, G., Bosio, P., & Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo F. Eusebio - Alba, 607 pag.〕 Japan,〔Matsubara et al (1992) Ganseki-Koubutsu-Koshogaku Zasshi, 87, 147-148.〕 Mexico,〔Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 944.〕 Namibia,〔Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany〕 Poland,〔Domańska, J.: Rędziny. Otoczak, nr. 29, p. 38-52. 〕 Spain,〔VIÑALS, J., CALVO, M., and MARTÍ, J. (2004): Parnauita, paratacamita y otros minerales secundarios de Cerro Minado, Almería. Revista de Minerales, 2, 5, 47-49.(in Spanish). Versions simultaneously published in Catalan (Mineralogistes de Catalunya) and in English version (Mineral Up)〕 Switzerland,〔Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer).〕 the United Kingdom,〔Golley, P., and Williams, R. (1995): Cornish Mineral Reference Manual. Endsleigh Publications (Truro), 104 pp.〕 and the United States.〔Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 6.〕 Mixite is the namesake member of the mixite mineral group, which has the general chemical formula Cu2+6''A''(''T''O4)3(OH)6·3H2O, where ''A'' is a REE, Al, Ca, Pb, or Bi, and ''T'' is P or As. In addition to mixite, this mineral group contains the isostructural minerals agardite-(Y),〔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〕 agardite-(Ce),〔Walenta K, Theye T (2004) Agardite-(Ce) of the Clara mine in the central Black Forest, Aufschluss 55, 17–23〕 agardite-(Nd),〔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〕 agardite-(La),〔Fehr T, Hochleitner R (1984) Agardite-La. Ein neues mineral von Lavrion, Griechenland, Lapis 9, 22-37〕 calciopetersite,〔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〕 goudeyite,〔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〕 petersite-(Ce),〔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 〕 petersite-(Y),〔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〕 plumboagardite,〔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〕 and zálesíite.〔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.〕 ==References== *(RRUFF Project ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mixite」の詳細全文を読む スポンサード リンク
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