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Cumengeite

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Formula:
Pb
 
21
Cu
 
20
Cl
 
42
(OH)
 
40
· 6H
 
2
O
System:TetragonalColour:Indigo blue
Lustre:Sub-VitreousHardness:
Name:After Édouard Cumenge (1828-1902), French mining engineer at Boleo, Mexico.


A secondary mineral.
May be confused with diaboleite.

Correct spelling defined by Burke (2008); other, incorrect spelling is cumengéite.

Classification of Cumengeite

IMA status:Approved
Strunz 8th edition ID:3/D.12-40
Nickel-Strunz 10th (pending) edition ID:3.DB.20

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
Dana 7th edition ID:10.6.7.1
Dana 8th edition ID:10.6.7.1

10 : OXYHALIDES AND HYDROXYHALIDES
6 : AmBn(O,OH)pXq
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Type Occurrence of Cumengeite

Type Locality:Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur (BC Sur), Mexico
Year of Discovery:1893
Associated Minerals at type locality:
PseudoboleiteBoleite

Occurrences of Cumengeite

Geological Setting:Secondary zone of lead deposits. Smelter slag immersed in sea water.

Physical Properties of Cumengeite

Lustre:Sub-Vitreous
Diaphaneity (Transparency):Translucent
Colour:Indigo blue
Streak:Sky-blue
Hardness (Mohs):
Cleavage:Distinct/Good
{101} good; {110} distinct; {001} Poor.
Density (measured):4.656 g/cm3
Density (calculated):4.66 g/cm3

Crystallography of Cumengeite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:I4/mmm
Cell Parameters:a = 15.065(2) Å, c = 24.436(5) Å
Ratio:a:c = 1 : 1.622
Unit Cell Volume:V 5,545.85 ų (Calculated from Unit Cell)
Z:2
Morphology:Octahedral or cubo-octahedral crystals. Commonly on the faces of boleite or pseudoboleite.

Epitaxial Relationships of Cumengeite

Epitaxial Minerals:
Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
Epitaxi Comments:Parallel overgrowths of cumengite on crystals of boleite and pseudoboleite.
X-Ray Powder Diffraction:
d-spacingIntensity
7.02 (4)
4.86 (9)
3.98 (4)
3.73 (6)
3.08 (4)
2.66 (4)
2.38 (10)

Optical Data of Cumengeite

Type:Uniaxial (-)
RI values: nω = 2.026 - 2.041 nε = 1.926 - 1.965
Maximum Birefringence:δ = 0.100

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Visible
Comments:Dichroic.
O = darker blue with green tint
E = Pure blue

Chemical Properties of Cumengeite

Formula:
Pb
 
21
Cu
 
20
Cl
 
42
(OH)
 
40
· 6H
 
2
O
Simplified for copy/paste:Pb21Cu20Cl42(OH)40·6H2O
Essential elements:Cl, Cu, H, O, Pb
All elements listed in formula:Cl, Cu, H, O, Pb

Relationship of Cumengeite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.DB.Rickturnerite
Pb
 
7
O
 
4
[Mg(OH)
 
4
](OH)Cl
 
3
3.DB.05Diaboleite
Pb
 
2
CuCl
 
2
(OH)
 
4
3.DB.10Pseudoboleite
Pb
 
31
Cu
 
24
Cl
 
62
(OH)
 
48
3.DB.15Boleite
KPb
 
26
Ag
 
9
Cu
 
24
(OH)
 
48
Cl
 
62
3.DB.25Bideauxite
Pb
 
2
AgCl
 
3
(F,OH)
 
2
3.DB.30Chloroxiphite
Pb
 
3
CuO
 
2
Cl
 
2
(OH)
 
2
3.DB.35Hematophanite
Pb
 
4
Fe
 
3
O
 
8
(OH,Cl)
3.DB.40Asisite
Pb
 
7
SiO
 
9
Cl
 
2
3.DB.40Parkinsonite
Pb
 
7
MoO
 
9
Cl
 
2
3.DB.45Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
where x<=0.5
3.DB.50Yedlinite
Pb
 
6
Cr
3+
 
Cl
 
6
(O,OH,H
 
2
O)
 
8

Other Names for Cumengeite

Synonyms:
CumengiteCumengite (of Groth)
Other Languages:
German:Cumengeit
Cumengit
Russian:Куменгит
Spanish:Cumengeita
Cumengita

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 Cumengeite

Reference List:

- +
Mallard (1893) Bulletin de la Société française de Minéralogie: 16: 184.

Friedel (1906) Bulletin de la Société française de Minéralogie: 29: 14.

Hadding (1919) Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 41: 175.

Gossner and Arm (1929) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 72: 202.

Hocart (1930) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 74: 20.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 79.

Hawthorne, F. C.; Groat, L. A. (1986): The crystal structure and chemical composition of cumengeite. Mineralalogical Magazine: 50, 157-162.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1997) Handbook of Mineralogy, Volume III. Halides, Hydroxides, Oxides. Mineral Data Publishing, Tucson, AZ, 628pp.: 150.

Cruciani, G., Orlandi, P., Pasero, M., Russo, M. (2005): First Italian occurrence of cumengéite from Vesuvio: crystal structure refinement and revision of the chemical formula. Mineralogical Magazine, 69, 1037-1045.

Burke, E. A. J. (2008): Tidying up Mineral Names: An IMA scheme for Suffixes, Hyphens and Diacritical Marks. Mineralogical Record, 39, 131-135.

Internet Links for Cumengeite

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  • Raman and XRD data at RRUFF project
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  • Localities for Cumengeite

    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.
    Australia
     
    • New South Wales
      • Yancowinna Co.
    No reference listed
    • South Australia
      • Mt Lofty Ranges
        • South Mt Lofty Ranges (Adelaide Hills)
          • Clarendon
    Kolitsch, U. and Elliott, P. (1999): Mineralogy of the Mount Malvern Mine near Clarendon, South Australia. Australian J. Mineral. 5, 3-17.
    • Tasmania
      • Penguin
    Bottrill, R.S. & Baker, W.E. (2008) A Catalogue of the Minerals of Tasmania. Bull. 73. Minerals Resources Tasmania
    • Western Australia
      • Ashburton Shire
    [MinRec 24:203]
    Ashburtonite, a new bicarbonate-silicate mineral from Ashburton Downs; J.D. Grice, E.H. Nickel, R.A. Gault; American Mineralogist, Vol 76, 001701-1707, 1991
    Austria
     
    • Carinthia
      • Friesach - Hüttenberg area
        • Hüttenberg
          • Waitschach
    Kolitsch, U., Brandstätter, F., Schreiber, F., Fink, R. & Auer, C. (2013): Die Mineralogie der weltweit einzigartigen Schlacken von Waitschach, Kärnten. Annalen des Naturhistorischen Museums in Wien, Serie A, 115, 19-87 (in German).
    Chile
     
    • Antofagasta Region
      • Tocopilla Province
        • Gatico District
    Sample analysed by Dr. Jochen Schluter (Hamburg University), Germany.
    France
     
    • Provence-Alpes-Côte d'Azur
      • Var
        • Le Pradet
    Cap Garonne museum specimen - EDS analysis by Association Jean Wyart, 2009
    Germany
     
    • Lower Saxony
      • Harz
        • Goslar
          • Astfeld
    van den Berg, W. & van Loon, C. (1990): Slag Minerals from the Rammelsberg, Harz Mountains, Germany. UK Journal of Mines & Minerals, 8, 18-23.
        • Lautenthal
    Karl Volkman collection
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Essen
    Weiss: "Mineralfundstellen, Deutschland West", 1990
    Greece
     
    • Attikí Prefecture (Attica; Attika)
      • Lavrion District (Laurion; Laurium)
        • Lavrion District Mines
          • Sounion area
            • Sounion Mines
    J. Gröbner und U. Kolitsch (2002): Neufunde von Laurion aus den Jahren 2001 und 2002. Aufschluss 53 (5-6), 363-371.
    Grolig, H. & Grolig, E. (1978): Lavrion in Attika. Lapis, 3 (5), 16-25; 40 (in German).
          • Agios Nikolaos [St Nicholas] area
    Fritz Schreiber collection (U. Kolitsch SXRD analysis)
          • Sounion area
    Fritz Schreiber collection (Uwe Kolitsch SXRD-analysis)
    Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • 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
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    Russo, M., Punzo, I. (2004): I minerali del Somma-Vesuvio, AMI
    • Latium
      • Rome Province
        • Anzio
    Palombi, S., Bellatreccia, F. & Pucci, R. (2009): Le scorie metallurgiche di Tor Caldara, Anzio - RM. Il Cercapietre, no. 1-2, 44-56. [http://www.gminromano.it/Cercapietre/rivista09/art03.pdf]
    • Liguria
      • Genova Province
        • Genova
          • Varenna Valley
    Rivista Mineralogica Italiana, 22 (3), 39-41.
    • Sardinia
      • Cagliari Province
        • Villaputzu
    Orlandi, P. & Campostrini, I. (2005): Zibaldone. Aggiornamenti di mineralogia italiana 2004. Rivista Mineralogica Italiana, 3/2005, 184-191.
    • Tuscany
      • Livorno Province
        • Campiglia Marittima
    http://www.comune.pisa.it/apsn/Articoli/Scorie/Capattoli.htm
          • Sassetta
    Jansen, H. & van den Berg, W. (1998): Slakkenmineralen in Toscane (Italië). Gea, no. 4, 109-117 (in Dutch).
        • Piombino
    Cerutti, G. and Preite, D. (1995): Mineralien der etruskischen Schlacken von Baratti, Toskana. Lapis, 20 (4), 13-18; 50 (in German).
    Luigi Chiappino data
    Mexico
     
    • Baja California Sur (BC Sur)
      • Mun. de Mulegé
        • Boleo District
    Bull.Soc.fr.Min.Crist. 16 (1893), 184; 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: 80; Mineralogical Record 5 (1973), 280-87; Min Mag 50 (1986), 157
    Rocks & Min.:63:390.; 2009 New Mexico Mineral Symposium abstracts
    Panczner(1987):92-350.
    Slovakia
     
    • Banská Bystrica Region
      • Revúca Co.
        • Nandráž
    Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Spain
     
    • Asturias
    José Rafael González López collection.
    Turkmenistan
     
    • Balkan Province
      • Cheleken Peninsula
    Lebedev, L.M., Nikitina, J.B. (1983): The Cheleken ore forming system. Russ. Acad. Sci., Moscow (in Russian.)
    UK
     
    • England
      • Cornwall
        • St Agnes District
          • Crantock
    BMS Newsletter 79, March 2010 (http://britishmicromountsociety.homestead.com/Gannell-Smelter.html)
          • Newquay
    No reference listed
    No reference listed
            • Trevelgue
    No reference listed
          • Perranzabuloe
            • Perran St George and Droskyn Mines
    George Eric Stanley Curtis specimen
        • St Just District
          • St Just
            • Botallack
              • Wheal Owles
    [Journal of the Russell Society, 6(1), 17-26 (1995)]
        • Wadebridge District
          • Padstow
            • Gunver Head
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
          • St Minver
            • Trebetherick
    No reference listed
        • Wendron & Falmouth District
          • Falmouth
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications; Allan C. Dean, Robert F. Symes, John H. Thomas and Peter A. Williams (1983) Cumengéite from Cornwall. Mineralogical Magazine 47:235-236.
          • Feock
            • Penpol
    Steve Sorrell collection
    • Wales
      • Gwynedd (Caernarvonshire)
        • Lleyn Peninsula
          • Llanengan
            • Abersoch
    Dossett, I. & Green, D.I., 1998. Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society 7(1), 37-38.
    USA
     
    • Arizona
      • Maricopa Co.
        • Big Horn Mts
          • Osborn District
            • Tonopah
              • Belmont Mountain
    Collected by and in the collection of Joe Ruiz. Analyzed by the University of Arizona.
        • Painted Rock Mts
          • Painted Rock District
            • Theba
    Raman ID on 2007 material; Michael Cline. Confirmed via single crystal X-ray by Dr. Marcus Origlieri.; Bob Meyer (2011) The Micro Mineral Collector. Friends of Mineralogy - Pacific Northwest Chapter Newsletter
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