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Mixite

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Formula:
BiCu6(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 administrater 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

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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Type Occurrence of Mixite

Year of Discovery:
1879
Associated Minerals at Type Locality:

Occurrences of Mixite

Geological Setting:
Secondary mineral in oxidationn zone of copper-bismuth deposits.

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)

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.

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

Formula:
BiCu6(AsO4)3(OH)6 · 3H2O
Essential elements:
All elements listed in formula:

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)2(HAsO4,AsO4)(OH)6 · 3H2O
ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O
8.DL.05FoggiteCaAl(PO4)(OH)2 · H2O
8.DL.10CyriloviteNaFe33+(PO4)2(OH)4 · 2H2O
8.DL.10Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
8.DL.10WarditeNaAl3(PO4)2(OH)4 · 2H2O
8.DL.15Agardite-(Nd)NdCu6(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(Ce)CeCu6(AsO4)3(OH)6 · 3H2O
8.DL.15Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O
8.DL.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2O
8.DL.15Petersite-(Y)(Y,Ce,Nd)Cu6(PO4)3(OH)6 · 3H2O
8.DL.15ZálesíiteCaCu6(AsO4)2(AsO3OH)(OH)6 · 3H2O
8.DL.15Plumboagardite(Pb,REE,Ca)Cu6(AsO4)2(HAsO4,AsO4)(OH)6 · 3H2O
8.DL.15CalciopetersiteCaCu6(PO4)2(PO3OH)(OH)6 · 3H2O
8.DL.20CheremnykhitePb3Zn3(VO4)2(TeO6)
8.DL.20DugganitePb3Zn3(AsO4)2(TeO6)
8.DL.20KuksitePb3Zn3(PO4)2(TeO6)
8.DL.20Wallkilldellite-(Mn)Ca2Mn32+(AsO4)2(OH)4 · 9H2O
8.DL.20Wallkilldellite-(Fe)(Ca,Cu)4Fe62+(AsO4,SiO4)4(OH,O)8 · 18H2O
8.DL.25AngastoniteCaMgAl2(PO4)2(OH)4 · 7H2O
20.6.1RooseveltiteBi(AsO4)
20.6.2PreisingeriteBi3(AsO4)2O(OH)
20.6.3Arsenobismite
20.6.4AtelestiteBi2(AsO4)O(OH)
20.6.6Walpurgite(BiO)4(UO2)(AsO4)2 · 3H2O

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 (1875) Mineralogische und petrographische Mitteilungen, Vienna: 42 (as Chlorotile).

Schrauf (1880) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 4: 278.

Hillebrand and Washington (1888) American Journal of Science: 35: 298.

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

Gordon (1925) Proceedings of the Academy of Sciences, Philadelphia: 77: 1.

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.

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

American Mineralogist (1982): 67: 1039.

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

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

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

Internet Links for Mixite

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.
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