Mixite Mineral Data

Mixite Mineral Data
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General Mixite Information

Help on Chemical Formula: Chemical Formula: BiCu6(AsO4)3(OH)6•3(H2O)
Help on Composition: Composition: Molecular Weight = 1,163.10 gm
   Copper    32.78 %  Cu   41.03 % CuO
   Bismuth   17.97 %  Bi   20.03 % Bi2O3
   Arsenic   19.32 %  As   29.64 % As2O5
   Hydrogen   1.04 %  H     9.29 % H2O
   Oxygen    28.89 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: BiCu6(AsO4)3(OH)6•3(H2O)
Help on Environment: Environment: Secondary mineral in bismuth-bearing ores.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: Jáchymov (St Joachimsthal), Krusne Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the mining engineer, A. Mixa from Jachymov, Czechoslovakia.
Help on Name Pronunciation: Name Pronunciation: Mixite Say MIXITE
Help on Synonym: Synonym: ICSD 70117
  PDF 13-414
 

Mixite Image

Click Here for Larger Mixite Image in a New Browser Window 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

Mixite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.43286
Help on Cell Dimensions: Cell Dimensions: a = 13.63, c = 5.9, Z = 2; V = 949.24 Den(Calc)= 4.07
Help on Crystal System: Crystal System: Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12(1), 2.46(0.9), 3.57(0.8),
Click Here for Large Mixite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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]
 

Physical Properties of Mixite

Help on Color: Color: Blue green, Yellow green, White, Light blue, Light green.
Help on Density: Density: 3.8
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: pale green
 

Optical Properties of Mixite

Help on Dichroism (e): Dichroism (e): almost colorless.
Help on Dichroism (w): Dichroism (w): fine green.
Help on Gladstone-Dale: 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
Ncalc = 1.68 - 1.73
Help on Optical Data: Optical Data: Uniaxial (+), w=1.73, e=1.81, bire=0.0800.
 

Calculated Properties of Mixite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Mixite =4.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001403978
Boson Index = 0.9998596022
Help on Photoelectric: Photoelectric: PEMixite = 342.30 barns/electron
U=PEMixite x rElectron Density=1,284.05 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mixite is Not Radioactive
 

Mixite Classification
Help on Dana Class: Dana Class: 42.05.01.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.05)where (A)2 (XO4) Zq · x(H2O)
  (42.05.01)Mixite group (Arsenate Series)
 
42.05.01.01 Mixite BiCu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
42.05.01.02 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
42.05.01.02a Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
42.05.01.02b Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m
 
42.05.01.02c Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m
 
42.05.01.02d Agardite-(Ca)! CaCu6(AsO4)3(OH)6•3(H2O) 6/m
 
42.05.01.02e Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
42.05.01.03 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6•3(H2O) Unk Hex
 
42.05.01.04 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]•3(H2O) P 63/m 6/m
 
42.05.01.06 Plumboagardite! (Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
Help on Strunz Class: Strunz Class: 08.DL.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DL -With large and medium-sized cations, (OH, etc.):RO4 = 2:1
 
08.DL.15 Agardite-(Dy)! (Dy,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m
 
08.DL.15 Agardite-(Ca)! CaCu6(AsO4)3(OH)6•3(H2O) 6/m
 
08.DL.15 Agardite-(Ce)! (Ce,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
08.DL.15 Agardite-(La)! (La,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
08.DL.15 Agardite-(Nd)! (Pb,Nd,Y,La,Ca)Cu6(AsO4)3(OH)6•3(H2O) 6/m
 
08.DL.15 Agardite-(Y) (Y,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
08.DL.15 Goudeyite (Al,Y)Cu6(AsO4)3(OH)6•3(H2O) Unk Hex
 
08.DL.15 Zalesiite! (Ca,Y)Cu6[(AsO4)2(AsO3OH)(OH)6]•3(H2O) P 63/m 6/m
 
08.DL.15 Mixite BiCu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 
08.DL.15 Petersite-(Y) (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6•3(H2O) P 63/m 6/m
 
08.DL.15 Calciopetersite! CaCu6[(PO4)2(PO3OH)(OH)6]•3(H2O) P 63/m 6/m
 
08.DL.15 Plumboagardite! (Pb,REE,Ca)Cu6(AsO4)3(OH)6•3(H2O) P 63/m 6/m
 

Other Mixite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Mixite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Print or Cut-and-Paste your Mixite Specimen Label here :

Mixite

BiCu6(AsO4)3(OH)6•3(H2O)
Dana No: 42.05.01.01 Strunz No: 08.DL.15
Locality:

 

Notes: