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Georgiadèsite

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Vrissaki Point slag locality, Vrissaki area, Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece
© Christian Rewitzer

Show Georgiadèsite Photos (4)
Formula:
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
System:MonoclinicColour:White, brownish yellow; ...
Hardness:3½
Name:After Mr. Georgiadès, a Director of the mines at Laurium, Greece.
This page provides mineralogical data about Georgiadèsite.

Classification of Georgiadèsite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/J.0-15
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.1.3.1

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

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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Type Occurrence of Georgiadèsite

Type Locality:Vrissaki Point slag locality, Vrissaki area, Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece
Year of Discovery:1907
Geological Setting of type material:N/A (occurred in altered lead slag)
Associated Minerals at type locality:
LaurioniteFiedleriteMatlockite

Physical Properties of Georgiadèsite

Lustre:Resinous
Colour:White, brownish yellow; colourless in transmitted light.
Hardness (Mohs):3½
Cleavage:None Observed
Density (measured):7.1 g/cm3

Crystallography of Georgiadèsite

Crystal System:Monoclinic
Cell Parameters:a = 13.8Å, b = 7.91Å, c = 10.81Å
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}
Crystal Atlas:
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Georgiadesite no.1 - Goldschmidt (1913-1926)

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Optical Data of Georgiadèsite

Type:Biaxial (+)
RI values: nα = 2.170 nβ = 2.170 nγ = 2.180
Maximum Birefringence:δ = 0.010

Chart 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:
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
Essential elements:As, Cl, H, O, Pb
All elements listed in formula:As, Cl, H, O, Pb

Relationship of Georgiadèsite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JB.05Fetiasite
(Fe
3+
 
,Fe
2+
 
,Ti)
 
3
[O
 
2
|As
 
2
O
 
5
]
4.JB.10Manganarsite
Mn
 
3
[(OH)
 
4
|As
 
2
O
 
4
]
4.JB.15Magnussonite
Mn
 
10
As
 
6
O
 
18
(OH,Cl)
 
2
4.JB.15UM1984-09-AsO:ClHMn
Mn
 
10
As
 
6
O
 
18
(OH)Cl
4.JB.20Armangite
Mn
2+
26
[CO
 
3
|(HAsO
 
3
)
 
4
|(AsO
 
3
)
 
14
]
4.JB.25Nanlingite
CaMg
 
4
[F
 
2
|AsO
 
3
]
 
2
4.JB.30Asbecasite
Ca
 
3
(Ti,Sn
4+
 
)Be
 
2
[(AsO
 
3
)
 
3
|SiO
 
4
]
 
2
4.JB.35Stenhuggarite
CaFeSbO(AsO
 
3
)
 
2
4.JB.40Trigonite
Pb
 
3
Mn
2+
 
[HAsO
 
3
|(AsO
 
3
)
 
2
]
4.JB.45Finnemanite
Pb
 
5
[Cl|(AsO
 
3
)
 
3
]
4.JB.50Gebhardite
Pb
 
8
[O|Cl
 
6
|(As
 
2
O
 
5
)
 
2
]
4.JB.55Derbylite
(Fe,Fe,Ti)
 
7
SbO
 
13
(OH)
4.JB.55Tomichite
(V,Fe)
 
4
Ti
 
3
AsO
 
13
OH
4.JB.55Graeserite
(Fe
3+
 
,Ti)
 
4
Ti
 
3
AsO
 
13
(OH)
4.JB.60Hemloite
(As,Sb)
 
2
(Ti,V,Fe,Al)
 
12
O
 
23
OH
4.JB.65Freedite
Pb
 
15
(Cu,Fe
2+
 
)
 
3
[O
 
7
|Cl
 
10
|(AsO
 
3
)
 
4
]
4.JB.75Ekatite
(Fe
3+
 
,Fe
2+
 
,Zn)
 
12
(OH)
 
6
(AsO
 
3
)
 
6
[AsO
 
3
,HOSiO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:

- +
22.2.1Sampleite
NaCaCu
 
5
[Cl|(PO
 
4
)
 
4
] · 5H
 
2
O
22.2.2Lavendulan
NaCaCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O
22.2.3Apatite-(CaCl)
Ca
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.4Turneaureite
Ca
 
5
[Cl|(AsO
 
4
,PO
 
4
)
 
3
]
22.2.5Shubnikovite
Ca
 
2
Cu
 
8
[Cl|OH|(AsO
 
4
)
 
6
] · 7H
 
2
O
22.2.6Richelsdorfite
Ca
 
2
Cu
 
5
Sb[Cl|(OH)
 
6
|(AsO
 
4
)
 
4
] · 6H
 
2
O
22.2.7Alforsite
Ba
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.8Morelandite
(Ba,Ca,Pb)
 
5
[Cl|(AsO
 
4
,PO
 
4
)
 
3
]
22.2.9Pyromorphite
Pb
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.10Mimetite
Pb
 
5
[Cl|(AsO
 
4
)
 
3
]
22.2.11Clinomimetite
Pb
 
5
[Cl|(AsO
 
4
)
 
3
]
22.2.12Sahlinite
Pb
 
14
[O
 
9
|(AsO
 
4
)
 
2
|Cl
 
4
]
22.2.14Vanadinite
Pb
 
5
[Cl|(VO
 
4
)
 
3
]
22.2.15Kombatite
Pb
 
14
[O
 
9
|(VO
 
4
)
 
2
|Cl
 
4
]
22.2.16Leningradite
PbCu
 
3
[Cl|VO
 
4
]
 
2
22.2.17Hedyphane
Pb
 
3
Ca
 
2
[Cl|(AsO
 
4
)
 
3
]
22.2.18Nealite
Pb
 
4
Fe
2+
 
[Cl
 
2
|AsO
 
3
]
 
2
 · 2H
 
2
O

Other Names for Georgiadèsite

Synonyms:
Georgiadesite
Other Languages:
German:Georgiadesit
Spanish:Georgiadesita

Other Information

Other Information:Soluble in HNO3.
Health Warning: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 and de Schulten (1907) Comptes rendu de l’Académie des sciences de Paris: 145: 783.

Lacroix and de Schulten (1908) Bulletin de la Société française de Minéralogie: 31: 86.

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.

Articles/Blogs about Georgiadèsite

Internet Links for Georgiadèsite

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    Localities for Georgiadèsite

    (TL) indicates type locality. ? 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 (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District slag localities
          • Passa Limani area
    		No reference listed
          • 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
    		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
      • Eastern Slovenské Rudohorie Mts
        • Dobšiná (Dobschau) Mining District
    		Pauliš P., Ďuďa R., 2002:Nejznámejší mineralogická nalezište Slovenska. Kuttna, Kutná Hora, 136p
    Mineral and/or Locality
    Google
     
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