• Source: Mixite

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. Mixite has also been found in Argentina, Australia, Austria, France, Germany, Greece, Hungary, Italy, Japan, Mexico, Namibia, Poland, Spain, Switzerland, the United Kingdom, and the United States.
Mixite is the namesake member of the mixite mineral 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 mixite, this mineral group contains the isostructural minerals agardite-(Y), agardite-(Ce), agardite-(Nd), agardite-(La), calciopetersite, goudeyite, petersite-(Ce), petersite-(Y), plumboagardite, and zálesíite.




References



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Further reading


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U., Blaß, G. & Auer, C. (2010): 1618) Bleihaltiger Agardit-(La) und Brookit von der Äußeren Wimitz, St. Veit an der Glan, Gurktaler
Alpen. P. 203 in Niedermayr et al. (2010): Neue Mineralfunde aus Österreich LIX. Carinthia II, 200./120., 199–260.
Petr Pauliš (2000): Nejzajímavější mineralogická naleziště Čech.
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; Neues Jahrbuch für Mineralogie, Monatshefte (1991), 487.
Lapis 2002(7/8), 54.
Sejkora, J., Gabasova, A., Novotna, M. (1997): Mixite from Smrkovec near Marianské Lazné. Bulletin Mineralogicko-Petrologického Oddělení Národního Muzea (Praha), 4–5, 185–187.
Sejkora, J.: Minerály ložiska Moldava v Krušných horách. Bulletin Mineralogicko-petrografického oddělení Národního muzea v Praze, 1994, volume. 2, s. 110–116.
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Jiří Sejkora, Petr Pauliš, Radana Malíková, Miroslav Zeman & Václav Krtek (2013): Supergenní minerály As ze štoly č. 2 Preisselberg, rudní revír Krupka (Česká republika) [Supergene As minerals from the Gallery No. 2, Preisselberg, the Krupka ore district (Czech Republic)]. Bulletin Mineralogicko-Petrologického Oddělení Národního Muzea (Praha) 21, 201–209.
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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.
Wittern, A. (1995) Mineralien finden im Schwarzwald.
Wittern: "Mineralfundorte in Deutschland", 2001.
Schrenk, D. (2000): Die Minerale des Steinbruchs 'Blessing' bei Hornberg. Erzgräber, 14 (1), 10–17.
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Solomos, C., Voudouris, P. & Katerinopoulos, A. (2004): Mineralogical studies of bismuth-gold-antimony mineralization at the area of Kamariza, Lavrion. Bulletin of the Geological Society of Greece 34, Proceedings of the 10th International Congress, Thessaloniki, Greece, 387–396.
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Ciriotti, M.E., Blaß, G. (2010): Pot-pourri 2009: Identificazioni UKiS AMI, Minerali italiani di interesse. Micro, 1/2010, 124–127.
Vecchi, F., Rocchetti, I. & Gentile, P. (2013): Die Mineralien des Granits von Predazzo, Provinz Trient, Italien. Mineralien-Welt, 24(6), 98–117.
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• Mixite
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• List of mineral symbols
• List of minerals
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• Nicole Mosconi
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