Georgiadesite Mineral Data

Georgiadesite Mineral Data +

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General Georgiadesite Information

Chemical Formula:

Pb4(AsO3)Cl4(OH)

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

Empirical Formula:

Pb₄(AsO₃)Cl_3.4(OH)_1.6

Environment:

Ancient lead slags altered by seawater.

IMA Status:

Valid Species (Pre-IMA) 1907

Locality:

Lavrion (Laurium), Attika peninsula, Greece Link to MinDat.org Location Data.

Name Origin:

Named for Georgiades, a director of the mines at Laurium, Greece.

Georgiadesite Image

Images:

Georgiadesite

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

Georgiadesite Crystallography

Axial Ratios:

a:b:c =1.7432:1:1.3682

Cell Dimensions:

a = 13.765, b = 7.896, c = 10.804, Z = 4; beta = 102.57° V = 1,146.12 Den(Calc)= 6.37

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 3.096(1), 3.164(0.5), 3.955(0.5),

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Forms: [ 0 1 1] [ 1 1 1] [ 1 1 0] [ 1 0 0] [ 0 0 1]

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Physical Properties of Georgiadesite

Cleavage:

None

Color:

Brownish yellow, White.

Density:

6.3

Hardness:

3.5 - Copper Penny

Luster:

Resinous

Streak:

white

Optical Properties of Georgiadesite

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

Optical Data:

Biaxial (+), a=2.17, b=2.17, g=2.18, bire=0.0100

Calculated Properties of Georgiadesite

Electron Density:

r_electron=5.30 gm/cc
note: r_{Georgiadesite}=6.37 gm/cc.

Fermion Index

Fermion Index = 0.16662
Boson Index = 0.83338

Photoelectric:

PE_{Georgiadesite}=1,397.52 barns/electron
U=PE_{Georgiadesite} x r_electron=7,403.74 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Georgiadesite is Not Radioactive

Georgiadesite Classification

Dana Class:

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

(41.1)where (A++)m (XO4)p Zq, with m:p>4:1

(41.1.3)Dana Group

41.1.3.1 Georgiadesite Pb4(AsO3)Cl4(OH) P 2₁/c 2/m

Strunz Class:

VII/B.40-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.40 - Atelestite - Kombatite series

VII/B.40-20 Georgiadesite Pb4(AsO3)Cl4(OH) P 2₁/c 2/m

VII/B.40-30 Sahlinite Pb14(AsO4)2O9Cl4 C 2/c 2/m

VII/B.40-40 Kombatite Pb14(VO4)2O9Cl4 C 2/c 2/m

Other Georgiadesite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AmMin, v 86, p 942) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Georgiadesite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Georgiadesite

Pb4(AsO3)Cl4(OH)
Dana No: 41.1.3.1 Strunz No: VII/B.40-20
Locality:

Notes: