Mineralogy Database

Bayldonite Mineral Data

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General Bayldonite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Zn)3Pb(AsO3OH)2(OH)2
Help on Composition: Composition: Molecular Weight = 730.28 gm
   Zinc       2.69 %  Zn    3.34 % ZnO
   Copper    23.49 %  Cu   29.41 % CuO
   Arsenic   20.52 %  As   31.47 % As2O5
   Hydrogen   0.83 %  H     7.40 % H2O
   Lead      28.37 %  Pb   30.56 % PbO
   Oxygen    24.10 %  O
            ______        ______ 
            100.00 %      102.19 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2.7Zn0.3Pb(AsO3OH)2(OH)2•(H2O)
Help on Environment: Environment: Vesignieite is the structural analog.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: St. Day, Cornwall, England Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after John Bayldon of England.
Help on Name Pronunciation: Name Pronunciation: Bayldonite + Pronunciation Say BAYLDONITE
Help on Synonym: Synonym: ICSD 8268
  PDF 26-1410

Bayldonite Image

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Comments: Green, rounded, crystalline bayldonite aggregates.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Bayldonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.3897:1:1.7227
Help on Cell Dimensions: Cell Dimensions: a = 14.083, b = 5.893, c = 10.152, Z = 4; beta = 106.1° V = 809.48 Den(Calc)= 5.99
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.14(1), 3.21(0.7), 2.93(0.6),

Physical Properties of Bayldonite

Help on Cleavage: Cleavage: None
Help on Color: Color: Grass green, Yellow green, Dark green.
Help on Density: Density: 5.5
Help on Diaphaneity: Diaphaneity: Subtranslucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: green

Optical Properties of Bayldonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1619,KPDmeas= 0.1764,KC= 0.1721
Ncalc = 1.95 - 2.03
Help on Optical Data: Optical Data: Biaxial (+), a=1.95, b=1.97, g=1.99, bire=0.0400

Calculated Properties of Bayldonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.96 gm/cc
note: Specific Gravity of Bayldonite =5.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEBayldonite = 510.08 barns/electron
U=PEBayldonite x rElectron Density=2,530.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bayldonite is Not Radioactive

Bayldonite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.14)Dana Group Bayldonite (Cu,Zn)3Pb(AsO3OH)2(OH)2 A2/a 2/m
Help on  Strunz Class: Strunz Class: 08.BH.45 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.45 Bayldonite (Cu,Zn)3Pb(AsO3OH)2(OH)2 A2/a 2/m
08.BH.45 Vesignieite Cu3Ba(VO4)2(OH)2 C 2/m 2/m

Other Bayldonite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Bayldonite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - HyperPhysics
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 08.BH.45





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