Georgiadesite
A valid IMA mineral species - grandfathered
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About Georgiadesite
Formula:
Pb4(As3+O3)Cl4(OH)
The As was originally assumed to be pentavalent.
Colour:
White, brownish yellow; colourless in transmitted light.
Lustre:
Resinous
Hardness:
3½
Specific Gravity:
6.3
Crystal System:
Monoclinic
Name:
After Mr. Georgiadès, a Director of the mines at Laurium, Greece (in 1896). This is likely Georges Georgiadès, a graduate of the Paris School of Mines and who wrote 'La Vérité sur la Laurium grec' in 1896.
This page provides mineralogical data about Georgiadesite.
Unique Identifiers
Mindat ID:
1677
Long-form identifier:
mindat:1:1:1677:9
GUID
(UUID V4):
(UUID V4):
095a3f49-7601-45a8-b205-43ebc9db8760
IMA Classification of Georgiadesite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1907
Classification of Georgiadesite
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
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
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
22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Ggd | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Georgiadesite
Resinous
Transparency:
Translucent
Colour:
White, brownish yellow; colourless in transmitted light.
Hardness:
3½ on Mohs scale
Cleavage:
None Observed
Density:
6.3(3) g/cm3 (Measured) 6.39 g/cm3 (Calculated)
Optical Data of Georgiadesite
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.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
extreme
Optical Extinction:
Y = b; Z = c.
Comments:
2V very large.
Chemistry of Georgiadesite
Mindat Formula:
Pb4(As3+O3)Cl4(OH)
The As was originally assumed to be pentavalent.
The As was originally assumed to be pentavalent.
Crystallography of Georgiadesite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 13.803(10) Å, b = 7.910(2) Å, c = 10.812(4) Å
β = 102.68(3)°
β = 102.68(3)°
Ratio:
a:b:c = 1.745 : 1 : 1.367
Unit Cell V:
1,151.68 ų (Calculated from Unit Cell)
Z:
1
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 Georgiadesite
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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Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
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Edge Lines | Miller Indices | Axes
Transparency
Opaque | Translucent | Transparent
View
Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.096 Å | (10) |
| 3.955 Å | (5) |
| 3.164 Å | (5) |
| 6.33 Å | (3) |
| 5.30 Å | (3) |
| 4.031 Å | (3) |
| 3.773 Å | (3) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47g : [Halogen-bearing surface weathering minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 56 : Slag and smelter minerals (see also #51 and #55) |
Type Occurrence of Georgiadesite
Place of Conservation of Type Material:
National School of Mines, Paris, France; American Museum of Natural History, New York City, New York, 28427; National Museum of Natural History, Washington, D.C., USA, 137839, 145938.
Geological Setting of Type Material:
N/A (occurred in altered lead slag)
Associated Minerals at Type Locality:
Reference:
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).
Synonyms of Georgiadesite
Other Language Names for Georgiadesite
German:Georgiadesit
Spanish:Georgiadesita
Common Associates
Associated Minerals Based on Photo Data:
| 15 photos of Georgiadesite associated with Paralaurionite | PbCl(OH) |
| 5 photos of Georgiadesite associated with Nealite | Pb4Fe2+(As3+O3)2Cl4 · 2H2O |
| 2 photos of Georgiadesite associated with Aragonite | CaCO3 |
| 1 photo of Georgiadesite associated with Calcite | CaCO3 |
| 1 photo of Georgiadesite associated with Diaboleite | Pb2CuCl2(OH)4 |
| 1 photo of Georgiadesite associated with Galena | PbS |
| 1 photo of Georgiadesite associated with Phosgenite | Pb2CO3Cl2 |
| 1 photo of Georgiadesite associated with Matlockite | PbFCl |
Related Minerals - Strunz-mindat Grouping
| 4.JB. | Cuyaite | Ca2Mn3+As3+14O24Cl |
| 4.JB. | Brattforsite | Mn19(AsO 3)12Cl2 |
| 4.JB.05 | Fetiasite | (Fe3+,Fe2+,Ti)3(As2O5)O2 |
| 4.JB.10 | Manganarsite | Mn3(As2O4)(OH)4 |
| 4.JB.15 | Magnussonite | Mn2+10(As3+O3)6(OH,Cl)2 |
| 4.JB.15 | UM1984-09-AsO:ClHMn | Mn10As6O18(OH)Cl |
| 4.JB.20 | Armangite | Mn2+26(AsO3)14(HAsO3)4(CO3) |
| 4.JB.25 | Nanlingite | Na(Ca5Li)Mg12(AsO3)2[Fe(AsO3)6]F14 |
| 4.JB.30 | Asbecasite | Ca3(Ti,Sn4+)Be2(AsO3)6(SiO4)2 |
| 4.JB.35 | Stenhuggarite | CaFeSb(AsO3)2O |
| 4.JB.40 | Trigonite | Pb3Mn2+(AsO3)2(HAsO3) |
| 4.JB.45 | Finnemanite | Pb5(AsO3)3Cl |
| 4.JB.50 | Gebhardite | Pb8(As2O5)2OCl6 |
| 4.JB.55 | Derbylite | Fe3+4Ti3Sb3+O13(OH) |
| 4.JB.55 | Tomichite | (V,Fe)4Ti3AsO13(OH) |
| 4.JB.55 | Graeserite | Fe3+4Ti3As3+O13(OH) |
| 4.JB.60 | Hemloite | (Ti,V3+,Fe3+,Al)12(As3+,Sb3+)2O23(OH) |
| 4.JB.65 | Freedite | Cu+Pb8(AsO3)2O3Cl5 |
| 4.JB.75 | Ekatite | (Fe3+,Fe2+,Zn)12(AsO3)6(AsO3,HSiO4)2(OH)6 |
| 4.JB.75 | Szklaryite | ◻Al6BAs3+3O15 |
| 4.JB.85 | Lepageite | Mn2+3(Fe3+7Fe2+4)O3[Sb3+5As3+8O34] |
| 4.JB.90 | Bianchiniite | Ba2(TiV)(As2O5)2OF |
Other Information
Notes:
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.
Internet Links for Georgiadesite
mindat.org URL:
https://www.mindat.org/min-1677.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Georgiadesite
Reference List:
Roland C. Rouse, , Pete J. Dunn, (1983) New data on georgiadesite. Mineralogical Magazine, 47 (343) 219-220 doi:10.1180/minmag.1983.047.343.12
Dunn, Pete J., Fleischer, Michael, Francis, Carl A., Langley, Richard H., Kissin, Stephen A., Shigley, Hames E., Vanko, David A., Zilczer, Janet A. (1984) New mineral names. American Mineralogist, 69 (7-8) 810-815 p.815
Localities for Georgiadesite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Greece | |
| 40 (in German) +3 other references |
| van Kalmthout (2012) | |
| Gelaude et al. (1996) | |
| Lacroix et al. (1908) +2 other references | |
Italy | |
| Muenchener Micromounter-Lithothek |
Slovakia | |
| Ďuďa R. et al. (in Slovak with English abstract) |
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Vrissaki Point slag locality, Lavrion slag localities, Lavreotiki, East Attica, Attica, Greece