Mineralogy Database

Georgiadesite Mineral Data

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General Georgiadesite Information

Help on Chemical Formula: Chemical Formula: Pb4(AsO3)Cl4(OH)
Help on Composition: Composition: Molecular Weight = 1,099.47 gm
   Arsenic    6.81 %  As    9.00 % As2O3
   Hydrogen   0.15 %  H     1.31 % H2O
   Lead      75.38 %  Pb   81.20 % PbO
   Chlorine  10.96 %  Cl   10.96 % Cl
               -   %   Cl   -2.47 % -O=Cl2   
   Oxygen     6.69 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb4(AsO3)Cl3.4(OH)1.6
Help on Environment: Environment: Ancient lead slags altered by seawater.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1907
Help on Locality: Locality: Lavrion (Laurium), Attika peninsula, Greece Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Georgiades, a director of the mines at Laurium, Greece.
Help on Name Pronunciation: Name Pronunciation: Georgiadesite + Pronunciation Say GEORGIADESITE
 

Georgiadesite Image

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  Georgiadesite

Comments: Light blue, pseudo-cubic crystal of georgiadesite.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Georgiadesite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.7432:1:1.3682
Help on Cell Dimensions: Cell Dimensions: a = 13.765, b = 7.896, c = 10.804, Z = 4; beta = 102.57° V = 1,146.12 Den(Calc)= 6.37
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.096(1), 3.164(0.5), 3.955(0.5),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 0 1 1) ( 1 1 1) ( 1 1 0) ( 1 0 0) ( 0 0 1)

Warning: this java applet does not work in some browsers because of security restrictions.

 

Physical Properties of Georgiadesite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish yellow, White.
Help on Density: Density: 6.3
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Resinous
Help on Streak: Streak: white
 

Optical Properties of Georgiadesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.107 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1842,KPDmeas= 0.1862,KC= 0.1682
Ncalc = 2.06 - 2.07
Help on Optical Data: Optical Data: Biaxial (+), a=2.17, b=2.17, g=2.18, bire=0.0100
 

Calculated Properties of Georgiadesite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.30 gm/cc
note: Specific Gravity of Georgiadesite =6.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEGeorgiadesite =1,397.52 barns/electron
U=PEGeorgiadesite x rElectron Density=7,403.74 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Georgiadesite is Not Radioactive
 

Georgiadesite Classification
Help on Dana Class: Dana Class: 41.01.03.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.01)where (A++)m (XO4)p Zq, with m:p>4:1
  (41.01.03)Dana Group
 
41.01.03.01 Georgiadesite Pb4(AsO3)Cl4(OH) P 21/c 2/m
Help on Strunz Class: Strunz Class: 04.JB.70 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
 
04.JB.70 Georgiadesite Pb4(AsO3)Cl4(OH) P 21/c 2/m
 

Other Georgiadesite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(AmMin, v 86, p 942) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Georgiadesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Georgiadesite

Pb4(AsO3)Cl4(OH)
Dana No: 41.01.03.01 Strunz No: 04.JB.70
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