Bayldonite Mineral Data

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Bayldonite Mineral Data

General Bayldonite Information

Chemical Formula:

(Cu,Zn)3Pb(AsO3OH)2(OH)2

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

Empirical Formula:

Cu_2.7Zn_0.3Pb(AsO₃OH)₂(OH)₂•(H₂O)

Environment:

Vesignieite is the structural analog.

IMA Status:

Valid Species (Pre-IMA) 1865

Locality:

St. Day, Cornwall, England Link to MinDat.org Location Data.

Name Origin:

Named after John Bayldon of England.

Name Pronunciation:

Bayldonite + Pronunciation

Synonym:

ICSD 8268

PDF 26-1410

Bayldonite Image

Images:

Bayldonite

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

Bayldonite Crystallography

Axial Ratios:

a:b:c =2.3897:1:1.7227

Cell Dimensions:

a = 14.083, b = 5.893, c = 10.152, Z = 4; beta = 106.1° V = 809.48 Den(Calc)= 5.99

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.14(1), 3.21(0.7), 2.93(0.6),

Crystal Structure:

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Ghose S , Wan C , Acta Crystallographica, Section B , 35 (1979) p.819-823, Structural chemistry of copper and zinc minerals. VI. Bayldonite,, (Cu,Zn)3Pb(AsO4)2(OH)2: A complex layer structure, Locality: Tsumeb, S.W. Africa

Physical Properties of Bayldonite

Cleavage:

None

Color:

Grass green, Yellow green, Dark green.

Density:

5.5

Diaphaneity:

Subtranslucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Greasy (Oily)

Streak:

green

Optical Properties of Bayldonite

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

Optical Data:

Biaxial (+), a=1.95, b=1.97, g=1.99, bire=0.0400

Calculated Properties of Bayldonite

Electron Density:

Bulk Density (Electron Density)=4.96 gm/cc
note: Specific Gravity of Bayldonite =5.50 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Bayldonite= 510.08 barns/electron
U=PE_Bayldonite x rElectron Density=2,530.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bayldonite is Not Radioactive

Bayldonite Classification

Dana Class:

41.05.14.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.05)where (A B)2 (XO4) Zq

(41.05.14)Dana Group

41.05.14.01 Bayldonite (Cu,Zn)3Pb(AsO3OH)2(OH)2 A2/a 2/m

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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
17 - WWW-MINCRYST

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Ask about Bayldonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Bayldonite

(Cu,Zn)3Pb(AsO3OH)2(OH)2
Dana No: 41.05.14.01 Strunz No: 08.BH.45
Locality:

Notes: