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Murdochite

A valid IMA mineral species - grandfathered
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About MurdochiteHide

02642420015396827374696.jpg
Joseph Murdoch
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.


Unique IdentifiersHide

Mindat ID:
2812
Long-form identifier:
mindat:1:1:2812:3
GUID
(UUID V4):
4b640466-1d80-464d-87e7-930ab0629db3

IMA Classification of MurdochiteHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1955

Classification of MurdochiteHide

3.DB.45

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
4.6.5.1

4 : SIMPLE OXIDES
6 : Miscellaneous
7.11.25

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MdhIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Pronunciation of MurdochiteHide

Pronunciation:
PlayRecorded byCountry
Jolyon RalphUnited Kingdom

Physical Properties of MurdochiteHide

Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
Hardness:
VHN100=519 - 567 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Distinct/Good
On {111}.
Density:
5.9 - 6.7 g/cm3 (Measured)    6.06 g/cm3 (Calculated)

Optical Data of MurdochiteHide

Type:
Isotropic
Reflectivity:
WavelengthR
470nm16.3%
490nm16.4%
510nm16.7%
530nm16.9%
570nm17.2%
610nm17.5%
630nm17.5%
650nm17.6%

Reflectance graph
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 MurdochiteHide

Mindat Formula:
Cu12Pb2O15Cl2

Crystallography of MurdochiteHide

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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000075MurdochiteChrist C L, Clark J R (1955) The crystal structure of murdochite disordered model American Mineralogist 40 907-91619550293
0000076MurdochiteChrist C L, Clark J R (1955) The crystal structure of murdochite ordered model American Mineralogist 40 907-91619550293
0009907MurdochiteWinkler 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 22-2620000293
0009981MurdochiteDubler E, Vedani A, Oswald H R (1983) New structure determination of murdochite, Cu6PbO8 Acta Crystallographica C39 1143-11461983Hansonburg mining district, New Mexico, USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 MurdochiteHide

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 MurdochiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
65 photos of Murdochite associated with QuartzSiO2
60 photos of Murdochite associated with MalachiteCu2(CO3)(OH)2
26 photos of Murdochite associated with CalciteCaCO3
20 photos of Murdochite associated with BrochantiteCu4(SO4)(OH)6
19 photos of Murdochite associated with HematiteFe2O3
19 photos of Murdochite associated with PlattneritePbO2
15 photos of Murdochite associated with Rosasite(Cu,Zn)2(CO3)(OH)2
14 photos of Murdochite associated with LinaritePbCu(SO4)(OH)2
13 photos of Murdochite associated with HemimorphiteZn4Si2O7(OH)2 · H2O
13 photos of Murdochite associated with MimetitePb5(AsO4)3Cl

Related Minerals - Strunz-mindat GroupingHide

3.DB.RickturneritePb7O4[Mg(OH)4](OH)Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
3.DB.05DiaboleitePb2CuCl2(OH)4Tet. 4mm : P4mm
3.DB.10PseudoboleitePb31Cu24Cl62(OH)48Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.15BoleiteKPb26Ag9Cu24(OH)48Cl62Iso. m3m (4/m 3 2/m) : Pm3m
3.DB.20CumengeitePb21Cu20Cl42(OH)40 · 6H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.25BideauxitePb2AgCl3(F,OH)2Iso. m3m (4/m 3 2/m) : Fd3m
3.DB.30ChloroxiphitePb3CuO2Cl2(OH)2Mon. 2/m : P21/m
3.DB.35HematophanitePb4Fe3O8(OH,Cl)Tet. 4mm : P4mm
3.DB.40AsisitePb7SiO9Cl2 Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.40ParkinsonitePb7MoO9Cl2 Tet.
3.DB.40JanchevitePb7V5+(O8.50.5)Cl2Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.45EddaviditeCu12Pb2O15Br2Iso. m3m (4/m 3 2/m) : Fm3m
3.DB.50YedlinitePb6Cr3+Cl6(O,OH,H2O)8Trig. 3 : R3
3.DB.55SiidraitePb2Cu(OH)2I3Orth. mmm (2/m 2/m 2/m) : Fddd

Other InformationHide

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 MurdochiteHide

References for MurdochiteHide

Localities for MurdochiteHide

This 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.

Locality ListHide

- 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.
Australia
 
  • Western Australia
    • City of Karratha
      • Whim Creek
P. Downes (1998)
Chile
 
  • Antofagasta
    • Antofagasta Province
      • Sierra Gorda
Georges FAVREAU collection & EDX ...
  • Atacama
    • Chañaral Province
      • Caballo Muerto mining district
gerhard mohn EDS and SEM
    • Copiapó Province
      • Copiapó
        • Quebrada San Miguel
Jordi Fabre
      • Tierra Amarilla
Maurizio Dini collection
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
        • Lavrion mining district
          • Agios Konstantinos (Kamariza)
            • Mercati mines
Fritz Schreiber collection
          • Lophos
            • Agrileza mines
Branko Rieck collection
Lapis et al. (1999)
Iran
 
  • Isfahan Province
    • Nain County
      • Anarak District
Karl Heinz Fabritz collection (Uwe Kolitsch SXRD analysis) +2 other references
Italy
 
  • Tuscany
    • Grosseto Province
      • Montieri
        • Gerfalco
Batacchi et al. (2011)
Mexico
 
  • Chihuahua
    • Aquiles Serdán Municipality
      • Santa Eulalia Mining District
        • East Camp
Megaw
  • Durango
    • Mapimí Municipality
      • Mapimí
Rocks & Min.: 56:247. +3 other references
Thomas P. Moore (2008)
Thomas P. Moore (2008)
USA
 
  • Arizona
    • Cochise County
Anthony et al. (1995)
        • Hendricks Gulch
Luetcke (n.d.) +3 other references
Galbraith (1959)
Graeme (1993) +1 other reference
Anthony et al. (1995)
    • Gila County
      • Banner Mining District
        • Hayden area
          • Chilito
Keith (1972) +1 other reference
    • La Paz County
      • New Water Mountains
Hunt (1983)
    • Maricopa County
      • Osborn Mining District
        • Tonopah
          • Belmont Mountain
MinRec 19 (3)
          • Tiger Wash
Yang et al. (2013)
    • Pima County
      • Waterman Mining District
        • Silver Hill Mining District
          • Silver Hill
Bideaux et al. (1960) +1 other reference
    • Pinal County
      • Mammoth Mining District
        • Tiger
          • St. Anthony deposit
Fahey (1955) +3 other references
      • Silver Reef Mining District
        • Tat Momoli Mountains
          • Chuichu area
            • Silver Reef Mountains area
              • White Horse Pass area
Collected by and in the collection of ...
  • California
    • San Bernardino County
      • Barstow Mining District
        • Barstow
          • Lead Mountain [2]
www.mineralsocal.org
      • Silver Lake Mining District
        • Soda Mountains
          • Baker
Kampf et al. (2010)
Collected by and in the collection of ...
Joe Marty specimens
          • Zzyzx
Pemberton (1983) +2 other references
  • Montana
    • Granite County
      • Philipsburg Mining District (Flint Creek Mining District)
Jensen et al. (2012)
  • Nevada
    • Clark County
      • Alunite Mining District
Richard W. Thomssen +1 other reference
    • Lincoln County
      • Delamar Mining District
        • Delamar Mine
Marek Chorazewicz (2021)
    • Nye County
      • Gabbs Mining District
Ron Layton Collection
  • New Mexico
    • Grant County
      • Georgetown Mining District
        • Georgetown
Walstrom (n.d.)
        • Mimbres mines group
Walstrom (n.d.)
    • Hidalgo County
      • Peloncillo Mountains
        • San Simon Mining District
          • Granite Gap
R&M 77:5 p298-305
In the collection of Brent Thorne. ...
R&M 77:5 p298-305
    • Luna County
      • Old Hadley Mining District
Walstrom 2006 New Mexico Mineral ...
    • Sierra County
Northrop et al. (1996)
Northrop et al. (1996)
    • Socorro County
Northrop et al. (1996)
        • Bingham
Northrop et al. (1996)
Ian Merkel
Jerry Cone Collection
Jerry Cone Collection
[Mineralogical Record 30:337]
 
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