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Cumengeite

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Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico
© Rob Lavinsky

Show Cumengeite Photos (52)
Formula:
Pb
 
21
Cu
 
20
Cl
 
42
(OH)
 
40
·6H
 
2
O
System:TetragonalColour:Indigo blue
Lustre:Sub-VitreousHardness:2½
Name:After Édouard Cumenge (1828-1902), French mining engineer at Boleo, Mexico.


A secondary mineral.

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, 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):2½
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 {I4/m 2/m 2/m}
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:
PseudoboleiteBoleite
Epitaxi Comments:Parallel overgrowths of cumengite on crystals of boleite and pseudoboleite.

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
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.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
Ag[(F,OH)
 
2
|Cl
 
3
]
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
[O
 
4
|SiO
 
4
|Cl
 
2
]
3.DB.40Parkinsonite
(Pb,Mo,[])
 
8
O
 
8
Cl
 
2
3.DB.45Murdochite
PbCu
 
6
O
 
8-x
(Cl,Br)
 
2x
 x<=0.5
3.DB.50Yedlinite
Pb
 
6
(Cl,OH)
 
6
Cr
3+
 
(OH,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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    Localities for Cumengeite

    Hide Locality List
    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
          • 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
      • Pilbara Region
        • Ashburton Shire
    		[MinRec 24:203]
    Germany
     
    • Lower Saxony
      • Harz Mts
        • Goslar
          • Astfeld
    		No reference listed
        • Lautenthal
    		Karl Volkman collection
    • North Rhine-Westphalia
      • Ruhr Coal Mining area
        • Essen
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • 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.
        • Lavrion District slag localities
          • Sounion area
    		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
    • 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
        • Piombino
    		Lapis, 20 (4), 13-18+50.
    Luigi Chiappino data
    Mexico
     
    • Baja California 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.
    Panczner(1987):92-350.
    Slovakia
     
    • Banská Bystrica Region
      • Western Slovenské Rudohorie Mts
        • Nandráž
    		Koděra et all.,1990: Topografická mineralógia Slovenska, I-III, 1590p
    Spain
     
    • Asturias
    		José Rafael González López collection.
    UK
     
    • England
      • Cornwall
        • St Agnes District
          • Newquay - Perranporth Area
            • Newquay
    		No reference listed
    No reference listed
    No reference listed
    No reference listed
    No reference listed
        • St Just District
          • Botallack - Pendeen Area
            • Botallack
    		[Journal of the Russell Society, 6(1), 17-26 (1995)]
        • Wadebridge District
          • Area West of Wadebridge
            • Padstow
    		No reference listed
    No reference listed
    No reference listed
            • St Minver
    		No reference listed
        • Wendron & Falmouth District
          • Carnmenellis area
            • Penpol
    		Steve Sorrell collection
          • Helford - Falmouth Area
            • Falmouth
    		No reference listed
    • 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.
        • Painted Rock Mts
          • Painted Rock District
            • Theba
    		Raman ID on 2007 material; Michael Cline. Confirmed via single crystal X-ray by Dr. Marcus Origlieri.
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the 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 hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 22nd Oct 2009 19:32:31