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Pseudocotunnite

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Formula:
K2PbCl4
System:
Orthorhombic
Colour:
Colourless, white
Name:
From the resemblance of the crystals to cotunnite.
Doubtful species, although the compound K2PbCl4 is known in synthetic form.
See also the related challacolloite.

Classification of Pseudocotunnite

Questionable/Doubtful
3.DC.90

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
11.2.1.1

11 : HALIDE COMPLEXES
2 : AmBX4
8.8.12

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
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http://www.mindat.org/min-3303.html
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First Recorded Occurrence of Pseudocotunnite

Year of Discovery:
1873
Geological Setting of First Recorded Material:
Active volcanic fumaroles.
Associated Minerals at First Recorded Locality:

Physical Properties of Pseudocotunnite

Colour:
Colourless, white

Crystallography of Pseudocotunnite

Crystal System:
Orthorhombic
Cell Parameters:
a = 9.82Å, b = 11.8Å, c = 5.77Å
Ratio:
a:b:c = 0.832 : 1 : 0.489
Unit Cell Volume:
V 668.60 ų (Calculated from Unit Cell)
Morphology:
Crystals flattened on {010} or {100}, with indistinct {hk0} and {0kl} faces; elongated [001] into needle-like or lath-like shapes. Veruginous aggregates and dendritic crusts.
Comment:
Probably orthorhombic (synthetic crystals have space group Pnma).

Optical Data of Pseudocotunnite

Type:
Biaxial
Dispersion:
relatively weak

Chemical Properties of Pseudocotunnite

Formula:
K2PbCl4
Essential elements:
All elements listed in formula:
Analytical Data:
Easily fusible; completely soluble in warm water.

Relationship of Pseudocotunnite to other Species

3.DC.05LaurionitePbCl(OH)
3.DC.05ParalaurionitePbCl(OH)
3.DC.10FiedleritePb3FCl4(OH) · H2O
3.DC.15PenfielditePb2Cl3(OH)
3.DC.20LaurelitePb7F12Cl2
3.DC.25Bismoclite(BiO)Cl
3.DC.25Daubréeite(BiO)(OH,Cl)
3.DC.25MatlockitePbFCl
3.DC.25RorisiteCaFCl
3.DC.25Zavaritskite(BiO)F
3.DC.25ZhangpeishaniteBaFCl
3.DC.30NadoritePbSbClO2
3.DC.30PeritePbBiClO2
3.DC.35AravaipaitePb3F3[AlF6] · H2O
3.DC.37CalcioaravaipaitePbCa2AlF9
3.DC.40ThorikositePb3Cl2(OH)(SbO3,AsO3)
3.DC.45MereheaditePb47Cl25(OH)13O24(CO3)(BO3)2
3.DC.50BlixitePb2(O,OH)2Cl
3.DC.55PinalitePb3WO5Cl2
3.DC.60SymesitePb10(SO4)O7Cl4 · H2O
3.DC.65EcdemitePb6Cl4(As2O7)
3.DC.65HeliophyllitePb6Cl4(As2O7)
3.DC.70MendipitePb3Cl2O2
3.DC.75DamaraitePb3Cl(OH)O2
3.DC.80OnoratoiteSb8Cl2O11
3.DC.85CotunnitePbCl2
3.DC.95BarstowitePb4Cl6(CO3) · H2O
8.8.1AbhuriteSn21Cl16(OH)14O6
8.8.2MatlockitePbFCl
8.8.3LaurelitePb7F12Cl2
8.8.4CotunnitePbCl2
8.8.5MendipitePb3Cl2O2
8.8.6DamaraitePb3Cl(OH)O2
8.8.7LaurionitePbCl(OH)
8.8.8ParalaurionitePbCl(OH)
8.8.9PenfielditePb2Cl3(OH)
8.8.10FiedleritePb3FCl4(OH) · H2O
8.8.11BlixitePb2(O,OH)2Cl
8.8.13DiaboleitePb2CuCl2(OH)4
8.8.14PseudoboleitePb31Cu24Cl62(OH)48
8.8.15ChloroxiphitePb3CuO2Cl2(OH)2
8.8.17BideauxitePb2AgCl3(F,OH)2
8.8.18BoleiteKPb26Ag9Cu24(OH)48Cl62
8.8.19AravaipaitePb3F3[AlF6] · H2O
8.8.20YedlinitePb6Cr3+Cl6(O,OH,H2O)8
8.8.21KolaritePbTeCl2
8.8.22HematophanitePb4Fe3O8(OH,Cl)

Other Names for Pseudocotunnite

Name in Other Languages:

Other Information

Other Information:
Totally soluble in warm water.
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 Pseudocotunnite

Reference List:
Scacchi, A. (1873): Contribuzioni mineralogiche per servire alla storia dell'incendio vesuviano del mese di aprile 1872 (parte seconda). Rendiconti della Reale Accademia delle Scienze Fisiche e Matematiche di Napoli, Serie 1, 6, 69 pp.

Scacchi, A. (1873): Acc. Napoli Att.: 6: no. 9 (as Pseudocotunnia).

Palmieri (1873) Reale accademia delle scienze fisische e matematiche, Naples, Rend.: 92 (as Pseudocotunnite).

Lorenz & Ruckstuhl (1906): Zeitschrift für anorganische und allgemeine Chemie, 51, 70-80.

Pelloux, A. (1927): The minerals of Vesuvius. American Mineralogist, 12, 14-19.

Zambonini, F. (1935): Mineralogia vesuviana. (2nd ed. by E. Quercigh Eds. Napoli, Italy). Atti della Reale Accademia delle Scienze Fisiche e Matematiche di Napoli, Serie II, suppl. 20, 1-463.

Palache, Charles, Harry Berman & Clifford Frondel (1951): The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 96-97.

Bellanca, A. & Sgarlata, F. (1952): Sulla struttura della pseudocotunnite. Rendiconti della Società Mineralogica Italiana, 8, 53.

Pensovecchio, M. & Salemi, E. (1952): Natura e sintesi della pseudocotunnite. Rendiconti della Società Mineralogica Italiana, 8, 58-59.

Internet Links for Pseudocotunnite

Localities for Pseudocotunnite

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)
[MinMax website]
Italy (FRL)
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
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: 96; Russo, M., 2006: I minerali di formazione fumarolica della grande eruzione vesuviana del 1906
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Campostrini I. et al - Vulcano: ein aussergewohnlicher Fundpunkt von neuen und seltenen Mineralien - MineralienWelt 2010 - nr.3 - p.40-57
Mineral and/or Locality  
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