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Cumengeite

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

Show Cumengeite Photos (29)
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.

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 Boleó), Boleó 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.20Cumengeite
3.DB.25Bideauxite
Pb
 
2
Ag[(F,OH)
 
2
|Cl
 
3
]
3.DB.30Chloroxiphite
Pb
 
3
CuCl
 
2
(OH)
 
2
O
 
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:
CumengeiteCumengite (of Groth)
German names:
CumengeitCumengit
Russian names:
Куменгит
Spanish names:
CumengeitaCumengita

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.

Articles/Blogs about Cumengeite

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.
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    (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.
    • 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
        • Piombino
    		Lapis, 20 (4), 13-18+50.
    Mexico
     
    • Baja California Sur
      • Mun. de Mulegé
        • Boleó 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
        • Nandraž
    		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
          • 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; Raman ID on 2007 material; Michael Cline. Confirmed via single crystal Xray by Marcus Origlieri.
    Mineral and/or Locality
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