Murdochite
A valid IMA mineral species - grandfathered
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About Murdochite
Formula:
Cu12Pb2O15Cl2
Colour:
Black
Lustre:
Adamantine
Hardness:
4
Specific Gravity:
5.9 - 6.7
Crystal System:
Isometric
Name:
After Professor Joseph Murdoch [February 19, 1890 Washington, D.C., USA – December 31, 1973 Santa Monica, California, USA], professor of mineralogy, University of California, Los Angeles, California, USA. Murdoch was an authority on ore microscopy and ore genesis. He studied, among other things, the California borate minerals, the Crestmore quarries, and pegmatites in northern Brazil. He also served as president of the Mineralogical Society of America.
A secondary mineral found in the oxidized zones of lead-copper deposits.
The Cl analogue of eddavidite with which it forms a solid solution.
The Cl analogue of eddavidite with which it forms a solid solution.
Unique Identifiers
Mindat ID:
2812
Long-form identifier:
mindat:1:1:2812:3
GUID
(UUID V4):
(UUID V4):
4b640466-1d80-464d-87e7-930ab0629db3
IMA Classification of Murdochite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1955
Classification of Murdochite
3.DB.45
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.
4.6.5.1
4 : SIMPLE OXIDES
6 : Miscellaneous
4 : SIMPLE OXIDES
6 : Miscellaneous
7.11.25
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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 |
---|---|---|
Mdh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Murdochite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Murdochite
Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
4 on Mohs scale
Hardness:
VHN100=519 - 567 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {111}.
On {111}.
Density:
5.9 - 6.7 g/cm3 (Measured) 6.06 g/cm3 (Calculated)
Optical Data of Murdochite
Type:
Isotropic
Reflectivity:
Wavelength | R |
---|---|
470nm | 16.3% |
490nm | 16.4% |
510nm | 16.7% |
530nm | 16.9% |
570nm | 17.2% |
610nm | 17.5% |
630nm | 17.5% |
650nm | 17.6% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 17.6%.
Colour in reflected light:
Grey with a yellowish brown tint
Comments:
Slightly higher reflectivity values are given in Criddle and Stanley (1993).
Chemistry of Murdochite
Mindat Formula:
Cu12Pb2O15Cl2
Elements listed:
Crystallography of Murdochite
Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Setting:
Fm3m
Cell Parameters:
a = 9.21 Å
Unit Cell V:
781.23 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals octahedral and cubo-octahedral.
Twinning:
Common on unstated law.
Comment:
Cell parameter data: a = 9.210-9.224 Å.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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) |
---|---|---|---|---|---|---|---|
0000075 | Murdochite | Christ C L, Clark J R (1955) The crystal structure of murdochite disordered model American Mineralogist 40 907-916 | 1955 | 0 | 293 | ||
0000076 | Murdochite | Christ C L, Clark J R (1955) The crystal structure of murdochite ordered model American Mineralogist 40 907-916 | 1955 | 0 | 293 | ||
0009907 | Murdochite | Winkler B, Chall M, Pickard C J, Milman V, White J (2000) Structure of Cu6PbO8 This model appears to be the stable phase at ambient conditions Acta Crystallographica B56 22-26 | 2000 | 0 | 293 | ||
0009981 | Murdochite | Dubler E, Vedani A, Oswald H R (1983) New structure determination of murdochite, Cu6PbO8 Acta Crystallographica C39 1143-1146 | 1983 | Hansonburg mining district, New Mexico, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.30 Å | (100) |
2.659 Å | (100) |
1.629 Å | (100) |
2.303 Å | (90) |
2.109 Å | (90) |
3.25 Å | (80) |
2.776 Å | (80) |
Comments:
Tiger, Arizona, USA. Data from Christ and Clark (1955).
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Murdochite
General Appearance of Type Material:
Tiny black opaque octahedra up to one millimeter in the longest dimension on the surface of, and embedded within, plates of wulfenite and on the surface of crystals of fluorite.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
An oxidized Pb–Cu deposit.
Associated Minerals at Type Locality:
Reference:
Fahey, J.J. (1955) Murdochite, a new copper lead oxide mineral. American Mineralogist: 40: 905-906.
Other Language Names for Murdochite
Common Associates
Associated Minerals Based on Photo Data:
65 photos of Murdochite associated with Quartz | SiO2 |
60 photos of Murdochite associated with Malachite | Cu2(CO3)(OH)2 |
26 photos of Murdochite associated with Calcite | CaCO3 |
20 photos of Murdochite associated with Brochantite | Cu4(SO4)(OH)6 |
19 photos of Murdochite associated with Hematite | Fe2O3 |
19 photos of Murdochite associated with Plattnerite | PbO2 |
15 photos of Murdochite associated with Rosasite | (Cu,Zn)2(CO3)(OH)2 |
14 photos of Murdochite associated with Linarite | PbCu(SO4)(OH)2 |
13 photos of Murdochite associated with Hemimorphite | Zn4Si2O7(OH)2 · H2O |
13 photos of Murdochite associated with Mimetite | Pb5(AsO4)3Cl |
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.20 | Cumengeite | Pb21Cu20Cl42(OH)40 · 6H2O |
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 | Eddavidite | Cu12Pb2O15Br2 |
3.DB.50 | Yedlinite | Pb6Cr3+Cl6(O,OH,H2O)8 |
3.DB.55 | Siidraite | Pb2Cu(OH)2I3 |
Other Information
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 Murdochite
mindat.org URL:
https://www.mindat.org/min-2812.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 Murdochite
Reference List:
Fahey, Joseph J. (1955) Murdochite, a new copper lead oxide mineral. American Mineralogist, 40 (9-10) 905-906
Christ, C. L., Clark, Joan R. (1955) The crystal structure of murdochite. American Mineralogist, 40 (9-10) 907-916
Fahey, Joseph J. (1955) Murdochite, a new copper lead oxide mineral. American Mineralogist, 40 (9-10) 905-906
Dubler, E., Vedani, A., Oswald, H. R. (1983) New structure determination of murdochite, Cu6PbO8. Acta Crystallographica Section C Crystal Structure Communications, 39 (9) 1143-1146 doi:10.1107/s0108270183007702
Dunn, Pete J., Fleischer, Michael, Francis, Carl A., Langley, Richard H., Kissin, Stephen A., Shigley, Hames E., Vanko, David A., Zilczer, Janet A. (1984) New mineral names. American Mineralogist, 69 (7-8) 810-815
Criddle, A. J., Stanley, C. J. (1993) Data file. In Quantitative Data File for Ore Minerals. Springer Netherlands. p.1-635. doi:10.1007/978-94-011-1486-8_1p.386
Localities for Murdochite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| P. Downes (1998) |
Chile | |
| Georges FAVREAU collection & EDX ... |
| gerhard mohn EDS and SEM |
| Jordi Fabre |
| Maurizio Dini collection |
Greece | |
| Fritz Schreiber collection |
| Branko Rieck collection |
Lapis et al. (1999) | |
Iran | |
| Karl Heinz Fabritz collection (Uwe Kolitsch SXRD analysis) +2 other references |
Italy | |
| Batacchi et al. (2011) |
Mexico | |
| Megaw |
| Rocks & Min.: 56:247. +3 other references |
Thomas P. Moore (2008) | |
Thomas P. Moore (2008) | |
USA | |
| Anthony et al. (1995) |
| Luetcke (n.d.) +3 other references |
Galbraith (1959) | |
Graeme (1993) +1 other reference | |
Anthony et al. (1995) | |
| Keith (1972) +1 other reference |
| Hunt (1983) |
| MinRec 19 (3) |
| |
Yang et al. (2013) | |
| Bideaux et al. (1960) +1 other reference |
| Fahey (1955) +3 other references |
| Collected by and in the collection of ... |
| www.mineralsocal.org |
| Kampf et al. (2010) |
Collected by and in the collection of ... | |
Joe Marty specimens | |
| Pemberton (1983) +2 other references |
| Jensen et al. (2012) |
| Richard W. Thomssen +1 other reference |
| Marek Chorazewicz (2021) |
| Ron Layton Collection |
| Walstrom (n.d.) |
| Walstrom (n.d.) |
| R&M 77:5 p298-305 |
In the collection of Brent Thorne. ... | |
R&M 77:5 p298-305 | |
| Walstrom 2006 New Mexico Mineral ... |
| Northrop et al. (1996) |
Northrop et al. (1996) | |
| Northrop et al. (1996) |
| Northrop et al. (1996) |
Ian Merkel | |
Jerry Cone Collection | |
Jerry Cone Collection | |
[Mineralogical Record 30:337] |
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Dos Adrianas Mine, Tierra Amarilla, Copiapó Province, Atacama, Chile