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Pseudocotunnite

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Formula:
K
 
2
PbCl
 
4
System:OrthorhombicColour: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

IMA status:Questionable/Doubtful
Strunz 8th edition ID:3/D.0-50
Nickel-Strunz 10th (pending) edition ID:3.DC.90

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
Dana 8th edition ID:11.2.1.1

11 : HALIDE COMPLEXES
2 : AmBX4
Hey's CIM Ref.:8.8.12

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
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Type Occurrence of Pseudocotunnite

Type Locality:Mt Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Year of Discovery:1873
Geological Setting of type material:Active volcanic fumaroles.
Associated Minerals at type locality:
TenoriteCotunnite

Physical Properties of Pseudocotunnite

Lustre:Dull
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:
K
 
2
PbCl
 
4
Simplified for copy/paste:K2PbCl4
Essential elements:Cl, K, Pb
All elements listed in formula:Cl, K, Pb
Analytical Data:Easily fusible; completely soluble in warm water.

Relationship of Pseudocotunnite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DC.05Laurionite
PbCl(OH)
3.DC.05Paralaurionite
PbCl(OH)
3.DC.10Fiedlerite
Pb
 
3
FCl
 
4
(OH) · H
 
2
O
3.DC.15Penfieldite
Pb
 
2
Cl
 
3
(OH)
3.DC.20Laurelite
Pb
 
7
F
 
12
Cl
 
2
3.DC.25Bismoclite
(BiO)Cl
3.DC.25Daubréeite
(BiO)(OH,Cl)
3.DC.25Matlockite
PbFCl
3.DC.25Rorisite
CaFCl
3.DC.25Zavaritskite
(BiO)F
3.DC.25Zhangpeishanite
BaFCl
3.DC.30Nadorite
PbSbClO
 
2
3.DC.30Perite
PbBiClO
 
2
3.DC.35Aravaipaite
Pb
 
3
F
 
3
[AlF
 
6
] · H
 
2
O
3.DC.37Calcioaravaipaite
PbCa
 
2
AlF
 
9
3.DC.40Thorikosite
Pb
 
3
Cl
 
2
(OH)(SbO
 
3
,AsO
 
3
)
3.DC.45Mereheadite
Pb
 
47
Cl
 
25
(OH)
 
13
O
 
24
(CO
 
3
)(BO
 
3
)
 
2
3.DC.50Blixite
Pb
 
2
(O,OH)
 
2
Cl
3.DC.55Pinalite
Pb
 
3
WO
 
5
Cl
 
2
3.DC.60Symesite
Pb
 
10
(SO
 
4
)O
 
7
Cl
 
4
· H
 
2
O
3.DC.65Ecdemite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
3.DC.65Heliophyllite
Pb
 
6
Cl
 
4
(As
 
2
O
 
7
)
3.DC.70Mendipite
Pb
 
3
Cl
 
2
O
 
2
3.DC.75Damaraite
Pb
 
3
Cl(OH)O
 
2
3.DC.80Onoratoite
Sb
 
8
Cl
 
2
O
 
11
3.DC.85Cotunnite
PbCl
 
2
3.DC.95Barstowite
Pb
 
4
Cl
 
6
(CO
 
3
) · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.8.1Abhurite
Sn
 
21
Cl
 
16
(OH)
 
14
O
 
6
8.8.2Matlockite
PbFCl
8.8.3Laurelite
Pb
 
7
F
 
12
Cl
 
2
8.8.4Cotunnite
PbCl
 
2
8.8.5Mendipite
Pb
 
3
Cl
 
2
O
 
2
8.8.6Damaraite
Pb
 
3
Cl(OH)O
 
2
8.8.7Laurionite
PbCl(OH)
8.8.8Paralaurionite
PbCl(OH)
8.8.9Penfieldite
Pb
 
2
Cl
 
3
(OH)
8.8.10Fiedlerite
Pb
 
3
FCl
 
4
(OH) · H
 
2
O
8.8.11Blixite
Pb
 
2
(O,OH)
 
2
Cl
8.8.13Diaboleite
Pb
 
2
CuCl
 
2
(OH)
 
4
8.8.14Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
8.8.15Chloroxiphite
Pb
 
3
CuO
 
2
Cl
 
2
(OH)
 
2
8.8.17Bideauxite
Pb
 
2
AgCl
 
3
(F,OH)
 
2
8.8.18Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
8.8.19Aravaipaite
Pb
 
3
F
 
3
[AlF
 
6
] · H
 
2
O
8.8.20Yedlinite
Pb
 
6
Cr
3+
 
Cl
 
6
(O,OH,H
 
2
O)
 
8
8.8.21Kolarite
PbTeCl
 
2
8.8.22Hematophanite
Pb
 
4
Fe
 
3
O
 
8
(OH,Cl)

Other Names for Pseudocotunnite

Synonyms:
Mellonite
Other Languages:
German:Pseudocotunnit
Italian:Pseudocotunnia
Spanish:Pseudocotunnita

Other Information

Other Information:Totally soluble in warm water.
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 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

Search Engines:
  • Look for Pseudocotunnite on Google
  • Look for Pseudocotunnite images on Google
  • External Links:
  • Pseudocotunnite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • SpiriferMinerals.com - high quality low prices
  • Search for Pseudocotunnite on Well-Arranged Molecules
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  • Find Pseudocotunnite on www.crystalclassics.co.uk
  • Localities for Pseudocotunnite

    The 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. ? 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
     
    • 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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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