Cumengeite
A valid IMA mineral species - grandfathered
This page kindly sponsored by John Kashuba
About Cumengeite
Formula:
Pb21Cu20Cl42(OH)40 · 6H2O
Colour:
Indigo blue
Lustre:
Sub-Vitreous
Hardness:
2½
Specific Gravity:
4.656
Crystal System:
Tetragonal
Name:
Named in honor of Bernard Louis Philippe Édouard Cumenge (16 April 1828, Castres, France - 20 July 1902, Paris, France), mining engineer at Boleo, Mexico. He collected the first specimens.
A secondary mineral.
May be confused with diaboleite.
Correct spelling defined by Burke (2008); other, incorrect spelling is cumengéite.
May be confused with diaboleite.
Correct spelling defined by Burke (2008); other, incorrect spelling is cumengéite.
Unique Identifiers
Mindat ID:
6894
Long-form identifier:
mindat:1:1:6894:5
GUID
(UUID V4):
(UUID V4):
011fb504-a812-4e9b-82d9-e2ed2c685ed7
IMA Classification of Cumengeite
Approved, 'Grandfathered' (first described prior to 1959)
Classification of Cumengeite
3.DB.20
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
Dana 7th ed.:
10.6.7.1
10.6.7.1
10 : OXYHALIDES AND HYDROXYHALIDES
6 : AmBn(O,OH)pXq
10 : OXYHALIDES AND HYDROXYHALIDES
6 : AmBn(O,OH)pXq
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Cge | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Cumengeite
Sub-Vitreous
Transparency:
Translucent
Colour:
Indigo blue
Streak:
Sky-blue
Hardness:
2½ on Mohs scale
Cleavage:
Distinct/Good
{101} good; {110} distinct; {001} Poor.
{101} good; {110} distinct; {001} Poor.
Density:
4.656 g/cm3 (Measured) 4.66 g/cm3 (Calculated)
Optical Data of Cumengeite
Type:
Uniaxial (-)
RI values:
nω = 2.026 - 2.041 nε = 1.926 - 1.965
Max Birefringence:
δ = 0.100
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
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
O = darker blue with green tint
E = Pure blue
Chemistry of Cumengeite
Mindat Formula:
Pb21Cu20Cl42(OH)40 · 6H2O
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 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.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014482 | Cumengeite | Hawthorne F C, Groat L A (1986) The crystal structure and chemical composition of cumengeite Mineralogical Magazine 50 157-162 |  | 1986 | Boleo, Baja California, Mexico | 0 | 293 |
CIF Raw Data - click here to close
Epitaxial Relationships of Cumengeite
Epitaxial Minerals:
| Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| Boleite | KPb26Ag9Cu24(OH)48Cl62 |
Epitaxy Comments:
Parallel overgrowths of cumengite on crystals of boleite and pseudoboleite.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.02 Å | (4) |
| 4.86 Å | (9) |
| 3.98 Å | (4) |
| 3.73 Å | (6) |
| 3.08 Å | (4) |
| 2.66 Å | (4) |
| 2.38 Å | (10) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] | |
| 47a : [Near-surface hydration of prior minerals] | |
| 47g : [Halogen-bearing surface weathering minerals] | |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 56 : Slag and smelter minerals (see also #51 and #55) |
Geological Setting:
Secondary zone of lead deposits. Smelter slag immersed in sea water.
Type Occurrence of Cumengeite
Place of Conservation of Type Material:
Muséum Nationale d’Histoire Naturelle, Paris, France, numbers 93.252, 95.98.
Associated Minerals at Type Locality:
Synonyms of Cumengeite
Other Language Names for Cumengeite
Common Associates
Associated Minerals Based on Photo Data:
| 37 photos of Cumengeite associated with Boleite | KPb26Ag9Cu24(OH)48Cl62 |
| 18 photos of Cumengeite associated with Phosgenite | Pb2CO3Cl2 |
| 17 photos of Cumengeite associated with Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| 11 photos of Cumengeite associated with Cerussite | PbCO3 |
| 9 photos of Cumengeite associated with Laurionite | PbCl(OH) |
| 8 photos of Cumengeite associated with Hemimorphite | Zn4Si2O7(OH)2 · H2O |
| 8 photos of Cumengeite associated with Diaboleite | Pb2CuCl2(OH)4 |
| 6 photos of Cumengeite associated with Paratacamite | Cu3(Cu,Zn)(OH)6Cl2 |
| 6 photos of Cumengeite associated with Paralaurionite | PbCl(OH) |
| 6 photos of Cumengeite associated with Anglesite | PbSO4 |
Related Minerals - Strunz-mindat Grouping
| 3.DB. | Rickturnerite | Pb7O4[Mg(OH)4](OH)Cl3 |
| 3.DB.05 | Diaboleite | Pb2CuCl2(OH)4 |
| 3.DB.10 | Pseudoboleite | Pb31Cu24Cl62(OH)48 |
| 3.DB.15 | Boleite | KPb26Ag9Cu24(OH)48Cl62 |
| 3.DB.25 | Bideauxite | Pb2AgCl3(F,OH)2 |
| 3.DB.30 | Chloroxiphite | Pb3CuO2Cl2(OH)2 |
| 3.DB.35 | Hematophanite | Pb4Fe3O8(OH,Cl) |
| 3.DB.40 | Asisite | Pb7SiO9Cl2 |
| 3.DB.40 | Parkinsonite | Pb7MoO9Cl2 |
| 3.DB.40 | Janchevite | Pb7V5+(O8.5◻0.5)Cl2 |
| 3.DB.45 | Murdochite | Cu12Pb2O15Cl2 |
| 3.DB.45 | Eddavidite | Cu12Pb2O15Br2 |
| 3.DB.50 | Yedlinite | Pb6Cr3+Cl6(O,OH,H2O)8 |
| 3.DB.55 | Siidraite | Pb2Cu(OH)2I3 |
Other Information
Notes:
Soluble in HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Cumengeite
mindat.org URL:
https://www.mindat.org/min-6894.html
Please feel free to link to this page.
Please feel free to link to this page.
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Mineral Dealers:
References for Cumengeite
Reference List:
Mallard, Ernest (1893) Sur la Boléite, la Cumengéite et la Percylite. Bulletin de Minéralogie, 16 (7) 184-195 doi:10.3406/bulmi.1893.2323
Lacroix, Alfred (1895) Sur quelques minéraux des mines du Boléo (Basse-Californie) Bulletin du Muséum national d'histoire naturelle , S. 1 Vol. 1. Muséum national d'histoire naturelle. 39-42
Friedel, Georges (1906) Contribution à l'étude de la boléite et de ses congénères. Bulletin de Minéralogie, 29 (2) 14-55 doi:10.3406/bulmi.1906.2769
Hadding, Assar (1919) Beitrag zur Kenntnis des Boleits und des Cumengits. Geologiska Föreningen i Stockholm Förhandlingar, 41 (2) 175-192 doi:10.1080/11035891909444444
Goßner, B., Arm, M. (1930) VIII. Chemische und röntgenographische Untersuchungen an Stoffen und Kristallen von komplexer Bauart. Zeitschrift für Kristallographie - Crystalline Materials, 72 (1) 202-236 doi:10.1524/zkri.1930.72.1.202pp.223-228
Hocart-Strasbourg, R. (1930) II. Sur la détermination des paramètres de la boléite, de la pseudoboléite et de la cumengéite, au moyen des rayons X. Zeitschrift für Kristallographie - Crystalline Materials, 74 (1) 20-24 doi:10.1524/zkri.1930.74.1.20
Alun Humphreys, D., Thomas, John H., Williams, Peter A., Symes, Robert F. (1980) The chemical stability of mendipite, diaboleïte, chloroxiphite, and cumengéite, and their relationships to other secondary lead(II) minerals. Mineralogical Magazine, 43 (331) 901-904 doi:10.1180/minmag.1980.043.331.13
Hawthorne, F. C., Groat, L. A. (1986) The crystal structure and chemical composition of cumengéite. Mineralogical Magazine, 50 (355) 157-162 doi:10.1180/minmag.1986.050.355.21
Cruciani, G., Orlandi, P., Pasero, M., Russo, M. (2005) First Italian occurrence of cumengéite from Vesuvius: crystal-structure refinement and revision of the chemical formula. Mineralogical Magazine, 69 (6) 1037-1045 doi:10.1180/0026461056960306
Localities for Cumengeite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Worner et al. (et al) |
| Kolitsch et al. (1999) |
| Bottrill et al. (2008) |
| Nickel et al. (1993) |
| Grice et al. (1991) | |
| Downes et al. (2017) |
| Downes et al. (2017) | |
Austria | |
| Kolitsch et al. (2013) |
Chile | |
| Arfè et al. (2016) |
| Samples analysed by Dr. Jochen Schlüter (Hamburg University) |
| SEM-EDS and Raman Spectroscopy by Joy ... |
France | |
| Cap Garonne museum specimen - EDS ... +1 other reference |
Germany | |
| van den Berg et al. (1990) |
| Karl Volkman collection |
| Weiß (1990) |
Greece | |
| Branko Rieck collection |
| Gröbner et al. (2002) |
| 40 (in German) +1 other reference | |
| Fritz Schreiber collection (U. Kolitsch SXRD analysis) | |
| Fritz Schreiber collection (Uwe Kolitsch SXRD-analysis) | |
| Ko Jansen collection | |
| The Minerals of Lavrion 2019 | |
| Gelaude et al. (1996) | |
| Gelaude et al. (1996) | |
| Gelaude et al. (1996) | |
Italy | |
| Russo et al. (2004) |
| Russo et al. (2004) +1 other reference | |
| Cruciani et al. (2005) |
| Marco Bonifazi collection +1 other reference |
| Rivista Mineralogica Italiana (3) |
| Orlandi et al. (2005) |
| www.comune.pisa.it (2000) |
| Franzini et al. (1992) +2 other references |
| Jansen et al. (1998) |
| Luigi Chiappino data |
Mexico (TL) | |
| Mallard (1893) +3 other references |
| Rocks & Min.:63:390. +1 other reference |
| Panczner (1987) |
Norway | |
| Husdal (2019) |
Slovakia | |
| Koděra (1986) |
Spain | |
| Christian Rewitzer collection - SEM-EDS ... |
| Valladares et al. (2021) |
| Rewitzer et al. (part2) |
| Calvo Rebollar et al. (2022) |
| Calvo Rebollar et al. (2018) |
| Calvo Rebollar et al. (2018) |
| Joan Abella i Creus specimens |
| Joan Abella i Creus (Joanabellacreus@gmail.com) | |
Turkmenistan | |
| Lebedev et al. (1983) |
UK | |
| BMS Newsletter 79 (http://britishmicromountsociety.homestead.com/Gannell-Smelter.html) |
| Dean et al. (1983) +1 other reference |
| Sorrell (n.d.) |
| |
| |
| Golley et al. (1995) |
| George Eric Stanley Curtis specimen |
| Elton et al. (1995) |
| |
| P D Trebilcock collection |
| Dossett et al. (1) |
USA | |
| Collected by and in the collection of ... |
| Raman ID on 2007 material +2 other references |
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Amelia Mine, Arroyo de la Soledad, Boleo District, Santa Rosalía, Mulegé Municipality, Baja California Sur, Mexico