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Georgiadèsite

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Formula:
Pb4(AsO3)Cl4(OH)
The As was originally assumed to be pentavalent.
System:
Monoclinic
Colour:
White, brownish yellow; ...
Lustre:
Resinous
Hardness:
Name:
After Mr. Georgiadès, a Director of the mines at Laurium, Greece (in 1896).
This page provides mineralogical data about Georgiadèsite.


Classification of Georgiadèsite

Approved, 'Grandfathered' (first described prior to 1959)
4.JB.70

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
B : Arsenites, antimonites, bismuthites; with additional anions, without H2O
41.1.3.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p > 4:1
22.2.13

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride

Physical Properties of Georgiadèsite

Resinous
Colour:
White, brownish yellow; colourless in transmitted light.
Hardness (Mohs):
Cleavage:
None Observed
Density:
7.1 g/cm3 (Measured)    

Optical Data of Georgiadèsite

Type:
Biaxial (+)
RI values:
nα = 2.170 nβ = 2.170 nγ = 2.180
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
extreme
Comments:
2V very large.

Chemical Properties of Georgiadèsite

Formula:
Pb4(AsO3)Cl4(OH)

The As was originally assumed to be pentavalent.
IMA Formula:
Pb4(As3+O3)Cl4(OH)
Elements listed in formula:

Crystallography of Georgiadèsite

Crystal System:
Monoclinic
Cell Parameters:
a = 13.8 Å, b = 7.91 Å, c = 10.81 Å
β = 102.68°
Ratio:
a:b:c = 1.745 : 1 : 1.367
Unit Cell Volume:
V 1,151.22 ų (Calculated from Unit Cell)
Morphology:
Crystals stubby, pseudo-hexagonal tablets with a platy composite structure parallel to [100] (apparently due to lamellar twinning). {001} grooved and striated [010].
Twinning:
Apparent lamellar twinning on {100} and {104}

Crystallographic forms of Georgiadèsite

Crystal Atlas:
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Georgiadesite no.1 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Type Occurrence of Georgiadèsite

Geological Setting of Type Material:
N/A (occurred in altered lead slag)
Associated Minerals at Type Locality:

Relationship of Georgiadèsite to other Species

4.JB.05Fetiasite(Fe3+,Fe2+,Ti)3(As2O5)O2
4.JB.10ManganarsiteMn3(As2O4)(OH)4
4.JB.15MagnussoniteMn10As6O18(OH,Cl)2
4.JB.15UM1984-09-AsO:ClHMnMn10As6O18(OH)Cl
4.JB.20ArmangiteMn262+(AsO3)14(HAsO3)4(CO3)
4.JB.25NanlingiteNa(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14
4.JB.30AsbecasiteCa3(Ti,Sn4+)Be2(AsO3)6(SiO4)2
4.JB.35StenhuggariteCaFeSb(AsO3)2O
4.JB.40TrigonitePb3Mn2+(AsO3)2(HAsO3)
4.JB.45FinnemanitePb5(AsO3)3Cl
4.JB.50GebharditePb8(As2O5)2OCl6
4.JB.55DerbyliteFe43+Ti3Sb3+O13(OH)
4.JB.55Tomichite(V,Fe)4Ti3AsO13(OH)
4.JB.55Graeserite(Fe3+,Ti)4Ti3AsO13(OH)
4.JB.60Hemloite(Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH)
4.JB.65FreediteCu+Pb8(AsO3)2O3Cl5
4.JB.75Ekatite(Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6
22.2.1SampleiteNaCaCu5(PO4)4Cl · 5H2O
22.2.2LavendulanNaCaCu5(AsO4)4Cl · 5H2O
22.2.3ChlorapatiteCa5(PO4)3Cl
22.2.4TurneaureiteCa5(AsO4)3Cl
22.2.5ShubnikoviteCa2Cu8(AsO4)6(OH)Cl · 7H2O
22.2.6RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
22.2.7AlforsiteBa5(PO4)3Cl
22.2.8MorelanditeCa2Ba3(AsO4)3Cl
22.2.9PyromorphitePb5(PO4)3Cl
22.2.10MimetitePb5(AsO4)3Cl
22.2.11Mimetite-MPb5(AsO4)3Cl
22.2.12SahlinitePb14(AsO4)2O9Cl4
22.2.14VanadinitePb5(VO4)3Cl
22.2.15KombatitePb14(VO4)2O9Cl4
22.2.16LeningraditePbCu3(VO4)2Cl
22.2.17HedyphaneCa2Pb3(AsO4)3Cl
22.2.18NealitePb4Fe2+(As3+O3)2Cl4 · 2H2O

Other Names for Georgiadèsite

Name in Other Languages:

Other Information

Other Information:
Soluble in HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Georgiadèsite

Reference List:
Lacroix, A. and Schulten, A. de. (1907): Sur une nouvellle espèce minérale, provenant des scories plombeuses athéniennes du Laurium. Comptes rendus hebdomadaires des séances de l'Académie des sciences, 45, 783-784. (in French).

Lacroix, A. & De Schulten, A. (1908): Note sur des minéraux plombifères des scories athéniennes du Laurion. Bulletin de la Société française de Minéralogie et de Cristallographie, 31, 79-90 (in French).

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 791-792.

Rouse, R.C. and P.J. Dunn (1983) New data on georgiadesite. Mineralogical Magazine: 47: 219-220.

American Mineralogist (1984): 69: 815.

Mineralogical Magazine: 64: 879-884.

Internet Links for Georgiadèsite

mindat.org URL:
https://www.mindat.org/min-1677.html
Please feel free to link to this page.

Localities for Georgiadèsite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Hochleitner, R. (1981): Neues von Lavrion. Lapis 6 (9), 24; Schnorrer-Köhler, G., Standfuss, K. & Standfuss, L. (1981): Neufunde von Mineralen aus den antiken Bleischlacken Laurions. Der Aufschluss, 32, 165-169.; Grolig, H. & Grolig, E. (1978): Lavrion in Attika. Lapis, 3 (5), 16-25; 40 (in German).
        • Passa Limani area
No reference listed
        • Sounion area
van Kalmthout, P. (2012): De slakkenmineralen van Lavrion (Gr.) - Ontwikkelingen na 1996, inclusief een archeologische ontdekking. GEA, 45 (1), 14-19 (in Dutch).
        • Thorikos area
Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
        • Vrissaki area
Lacroix, A. & De Schulten, A. (1908): Note sur des minéraux plombifères des scories athéniennes du Laurion. Bulletin de la Société française de Minéralogie et de Cristallographie, 31, 79-90 (in French).; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 792; Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
Italy
 
  • Tuscany
    • Livorno Province
      • Piombino
Muenchener Micromounter-Lithothek
Slovakia
 
  • Košice Region
    • Rožňava Co.
      • Dobšiná (Dobschau; Topschau)
Ďuďa R., Peterec D., 1990: Vzácne sekundárne minerály olova z Dobšinej. Zbor. Východoslov. múzea v Košiciach, Prír. vedy 32-33, 193-199 (in Slovak with English abstract).
Mineral and/or Locality  
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