General Mixite Information
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Chemical Formula: |
BiCu6(AsO4)3(OH)6·3(H2O) |
Composition: |
Molecular Weight = 1,163.10 gm |
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Copper 32.78 % Cu 41.03 % CuO |
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Bismuth 17.97 % Bi 20.03 % Bi2O3 |
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Arsenic 19.32 % As 29.64 % As2O5 |
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Hydrogen 1.04 % H 9.29 % H2O |
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Oxygen 28.89 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
BiCu6(AsO4)3(OH)6·3(H2O) |
Environment: |
Secondary mineral in bismuth-bearing ores. |
IMA Status: |
Valid Species (Pre-IMA) 1880 |
Locality: |
Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic Link to MinDat.org Location Data. |
Name Origin: |
Named after the mining engineer, A. Mixa from Jachymov, Czechoslovakia. |
Synonym: |
ICSD 70117 |
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PDF 13-414 |
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Mixite Image |
Images:
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Mixite
Comments: Vuggy quartz matrix with green radial sprays of mixite crystals.
Location: Northern Star mine, Tintic district, Utah, USA.
Scale: 6 x 5 x 4 cm.
© John Veevaert |
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Mixite Crystallography
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Axial Ratios: |
a:c = 1:0.43286 |
Cell Dimensions: |
a = 13.63, c = 5.9, Z = 2; V = 949.24 Den(Calc)= 4.07 |
Crystal System: |
Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m |
X Ray Diffraction: |
By Intensity(I/Io): 12(1), 2.46(0.9), 3.57(0.8), |
Crystal Structure:
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Help on Above
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Miletich R , Zemann J , Nowak M , Physics and Chemistry of Minerals , 24 (1997) p.411-422, Reversible hydration in synthetic mixite, BiCu6(OH)6(AsO4)3.nH2O(n<=3):, hydration kinetics and crystal chemistry, Sample: H20
View Additional jPOWD Structure files for Mixite
[1]
[2]
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Physical Properties of Mixite
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Color: |
Blue green, Yellow green, White, Light blue, Light green. |
Density: |
3.8 |
Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
Habit: |
Acicular - Occurs as needle-like crystals. |
Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Hardness: |
3.5-4 - Copper Penny-Fluorite |
Luminescence: |
None. |
Luster: |
Adamantine |
Magnetism: |
Nonmagnetic |
Streak: |
pale green |
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Optical Properties of Mixite
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Dichroism (e): |
almost colorless. |
Dichroism (w): |
fine green. |
Gladstone-Dale: |
CI meas= -0.126 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1892,KPDmeas= 0.2026,KC= 0.18 |
Optical Data: |
Uniaxial (+), w=1.73, e=1.81, bire=0.0800. |
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Calculated Properties of Mixite
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Electron Density: |
relectron=3.75 gm/cc note: rMixite =4.07 gm/cc. |
Fermion Index |
Fermion Index = 0.00014 Boson Index = 0.99986 |
Photoelectric: |
PEMixite = 342.30 barns/electron U=PEMixite x relectron=1,284.05 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Mixite is Not Radioactive |
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Mixite Classification
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Dana Class: |
42.5.1.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.5)where (A)2 (XO4) Zq · x(H2O) |
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(42.5.1)Mixite group (Arsenate Series) |
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42.5.1.1 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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42.5.1.2 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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42.5.1.2a Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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42.5.1.2b Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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42.5.1.2c Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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42.5.1.2d Agardite-(Ca)! CaCu6(AsO4)3(OH)6·3(H2O) 6/m |
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42.5.1.2e Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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42.5.1.3 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex |
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42.5.1.4 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]·3(H2O) P 63/m 6/m |
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42.5.1.6 IMA2003-031a! (Pb,REE,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
Strunz Class: |
VII/D.53-90 VII - Phosphates, Arsenates and Vanadates |
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VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K |
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VII/D.53 - Mixite - Agardite group |
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VII/D.53-10 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-20 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6·3(H2O) Unk Hex |
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VII/D.53-30 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]·3(H2O) P 63/m 6/m |
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VII/D.53-40 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-50 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-60 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-70 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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VII/D.53-80 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6·3(H2O) 6/m |
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VII/D.53-90 Mixite BiCu6(AsO4)3(OH)6·3(H2O) P 63/m 6/m |
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VII/D.53-95 Juanitaite! (Cu,Ca,Fe)10Bi(AsO4)4(OH)11·2(H2O) P 41/nnm 4/m 2/m 2/m |
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VII/D.53-100 Mrazekite Bi2Cu3(PO4)2O2(OH)2·2(H2O) P 21/n 2/m |
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Other Mixite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
See Also: |
Links to other databases for Mixite :
1 -Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 -Athena
4 - Crocoite.com Mineral Locations
5 - EUROmin Project
6 -Google Images
7 -Google Scholar
8 -Handbook of Mineralogy (UofA)
9 -MinDAT
10 -MinMax(Deutsch)
11 -MinMax(English)
12 -Mineralienatlas (Deutsch)
13 -QUT Mineral Atlas
14 - WWW-MINCRYST
15 -École des Mines de Paris
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Print or Cut-and-Paste your Mixite Specimen Label here :
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Mixite
BiCu6(AsO4)3(OH)6·3(H2O)
Dana No: 42.5.1.1 Strunz No: VII/D.53-90
Locality:
Notes:
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