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Mixite

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Anton Mixa
Formula:
Cu62+Bi(AsO4)3(OH)6 · 3H2O
System:
Hexagonal
Colour:
pale green, blue-green, ...
Lustre:
Vitreous
Hardness:
3 - 4
Member of:
Name:
Named by Albrecht Schrauf in honor of Anton Mixa [November 23, 1838 Pribram, Czech Republic - July 21, 1906 Pribram, Czech Republic], a mining engineer and administrator in government service through the Austria-Hungary Empire and who was Czech mining director of Příbram at Jáchymov, Czech Republic.
Mixite Group.

A rare secondary mineral in the oxidized zones of copper-bismuth deposits.


Classification of Mixite

Approved, 'Grandfathered' (first described prior to 1959)
8.DL.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
L : With large and medium-sized cations, (OH, etc.):RO4 = 2:1
42.5.1.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)7(XO4)3Zq·xH2O
20.6.5

20 : Arsenates (also arsenates with phosphate, but without other anions)
6 : Arsenates of Bi

Physical Properties of Mixite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Comment:
Silky in aggregates.
Colour:
pale green, blue-green, emerald-green, white; light green to colourless in transmitted light.
Streak:
Pale bluish green
Hardness (Mohs):
3 - 4
Density:
3.79 - 3.83 g/cm3 (Measured)    4.04 g/cm3 (Calculated)

Optical Data of Mixite

Type:
Uniaxial (+)
RI values:
nω = 1.743 - 1.749 nε = 1.810 - 1.830
Max Birefringence:
δ = 0.067
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
O = Colourless
E = Bright green

Chemical Properties of Mixite

IMA Formula:
Cu62+Bi(AsO4)3(OH)6 · 3H2O
Elements listed in formula:

Crystallography of Mixite

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 13.646(2) Å, c = 5.92Å
Ratio:
a:c = 1 : 0.434
Unit Cell Volume:
V 954.69 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals acicular, elongated along [0001] and deeply striated vertically. Commonly occurs matted or as radial aggregates with a partial concentric fibrous structure or cross-fiber veinlets.

Occurrences of Mixite

Type Occurrence of Mixite

Associated Minerals at Type Locality:

Relationship of Mixite to other Species

Member of:
Other Members of Group:
Agardite-(Ce)CeCu6(AsO4)3(OH)6 · 3H2O
Agardite-(Dy)(Dy,La)Cu6(AsO4)3(OH)6 · 3H2O
Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O
Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
CalciopetersiteCaCu6(PO4)2(PO3OH)(OH)6 · 3H2O
GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2O
Petersite-(Ce)Cu6Ce(PO4)3(OH)6·3H2O
Petersite-(Y)(Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2O
Plumboagardite(Pb,REE,Ca)Cu6(AsO4)3(OH)6 · 3H2O
ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O
8.DL.05FoggiteCaAlPO4(OH)2 · H2O
8.DL.10CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
8.DL.10MillisiteNaCaAl6(PO4)4(OH)9 · 3H2O
8.DL.10WarditeNaAl3(PO4)2(OH)4 · 2H2O
8.DL.15Agardite-(Nd)Cu62+Nd(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(Y)Cu62+Y(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(Ce)Cu62+Ce(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(La)Cu62+La(AsO4)3(OH)6 · 3H2O
8.DL.15GoudeyiteCu62+Al(AsO4)3(OH)6 · 3H2O
8.DL.15Petersite-(Y)Cu62+Y(PO4)3(OH)6 · 3H2O
8.DL.15ZálesíiteCu62+Ca(AsO4)2(AsO3OH)(OH)6 · 3H2O
8.DL.15PlumboagarditeCu62+(Pb,La,Nd,Ce,Ca)(AsO4)3(OH)6 · 3H2O
8.DL.15CalciopetersiteCu62+Ca(PO4)2(PO3OH)(OH)6 · 3H2O
8.DL.20CheremnykhitePb3Zn3TeO6(VO4)2
8.DL.20DugganitePb3Zn3(TeO6)(AsO4)2
8.DL.20KuksitePb3Zn3Te6+O6(PO4)2
8.DL.20WallkilldelliteCa4Mn62+(AsO4)4(OH)8 · 18H2O
8.DL.20Wallkilldellite-(Fe)(Ca,Cu)4Fe6(AsO4,SiO4)4(OH)8 · 18H2O
8.DL.25AngastoniteCaMgAl2(PO4)2(OH)4 · 7H2O
20.6.1RooseveltiteBiAsO4
20.6.2PreisingeriteBi3O(AsO4)2(OH)
20.6.3Arsenobismite
20.6.4AtelestiteBi2O(AsO4)(OH)
20.6.6WalpurgiteBi4O4(UO2)(AsO4)2 · 2H2O

Other Names for Mixite

Name in Other Languages:
German:Mixit
Russian:Миксит
Simplified Chinese:砷铋铜矿
Spanish:Mixita
Traditional Chinese:砷鉍銅石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Mixite

Reference List:
Frenzel, A. (1875) Mineralogische und petrographische Mitteilungen, Vienna: 42. (as Chlorotile)

Schrauf, A. (1880) Ueber Arsenate von Joachimsthal 1. Mixit, ein neues Kupferwismuthhydroarsenat. Zeitschrift für Kristallographie, Mineralogie und Petrographie: 4: 277-285.

Hillebrand, W.F., Washington, H.S. (1888) Notes on certain rare copper minerals from Utah. American Journal of Science: 35: 298-307.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 111.

Gordon, S.G. (1925) The probable identity of chlorotile with mixite. in Mineralogical Notes, 1-10. Proceedings of the Academy of Sciences, Philadelphia: 77: 1-13.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 943-944.

Kokkoros, P. (1953) Röntgensymmetrie von Mixit. Tschermaks Mineralogische und Petrographische Mitteilungen: 3: 56-60.

Walenta, K. (1960) Chlorotil und Mixit. Neues Jahrbuch für Mineralogie, Monatshefte: 1960: 223–236. (in German)

Peacor, D.R., Dunn, P.J. (1982) Petersite, a REE and phosphate analog of mixite. American Mineralogist: 67: 1039-1042.

Mereiter, K., Preisinger, A. (1986) Kristallstrukturdaten der Wismutminerale Atelestit, Mixit, und Pucherit. Anzeiger der Österreichische Akademie der Wissenschaften, Mathematisch-naturwissenschaftliche Klasse, Anzeiger: 123: 79–81. (in German)

Olmi, F., Sabelli, C., Ferroni, R.T. (1991) A contribution to the crystal chemistry of mixite group minerals from Sardinia (Italy). Neues Jahrbuch für Mineralogie: 11: 487-499.

Sejkora, J., Šrein, V. (1995) A contribution to crystal chemistry of mixite from localities in the Czech Massif. Zprávy o geologických výzkumech v roce 1995: 153-155.

Journal of the Czech Geological Society, Prague (1997): 42(4): 37.

Miletich, R., Zemann, J., Nowak, M. (1997) Reversible hydration in synthetic mixite, BiCu6(OH)6(AsO4)3 • nH2O (n≤3): hydration kinetics and crystal chemistry. Physics and Chemistry of Minerals: 24: 411-422.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 380.

Frost, R.L., Weier, M., Martens, W., Duong, L. (2005) Identification of mixite minerals - an SEM and Raman spectroscopic analysis. Mineralogical Magazine: 69: 169-177.

Frost, R.L., Weier, M., Martens, W. (2006) Using Raman spectroscopy to identify mixite minerals. Spectrochimica Acta Part A: 63: 60-65.

Cejka, J., Sejkora, J., Plášil, J., Keeffe, E.C., Bahfenne, S., Palmer, S.J., Frost, R.L. (2010) A Raman and infrared spectroscopic study of Ca2+ dominant members of the mixite group from the Czech Republic. Journal of Raman Spectroscopy: 42: 1154-1159.

Internet Links for Mixite

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http://www.mindat.org/min-2730.html
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Localities for Mixite

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.
Mineral and/or Locality  
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