Mineralogy Database

Murdochite Mineral Data

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General Murdochite Information

Help on Chemical  Formula: Chemical Formula: PbCu6O8-x(Cl,Br)2x
Help on Composition: Composition: Molecular Weight = 760.62 gm
   Copper    50.96 %  Cu   63.79 % CuO
   Lead      24.52 %  Pb   26.41 % PbO
   Bromine    3.15 %  Br    3.15 % Br
               -   %   Br   -0.32 % -O=Br2   
   Chlorine   5.59 %  Cl    5.59 % Cl
               -   %   Cl   -1.26 % -O=Cl2   
   Oxygen    15.78 %  O
            ______        ______ 
            100.00 %       97.37 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb0.9Cu6.1O7.5Cl1.2Br0.3
Help on Environment: Environment: Oxidized Pb-Cu deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1955
Help on Locality: Locality: Mammoth-St. Anthony mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Joseph Murdock (1890-1973), American mineralogist, University of California, Los Angeles, California, USA.
Help on Name Pronunciation: Name Pronunciation: Murdochite + Pronunciation Say MURDOCHITE
Help on Synonym: Synonym: ICSD 37239
  PDF 28-Jul

Murdochite Image

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  Murdochite   Smithsonite

Comments: Dark metallic micro crystals of murdochite on pale blue-gray smithsonite crystal covered matrix.
Location: Silver Hill Mine group, Silver Hill, Waterman District, Waterman Mts, Pima Co., Arizona, USA. Scale: 5x4x2 cm.
© John Betts - Fine Minerals

Murdochite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 9.224, Z = 4; V = 784.80 Den(Calc)= 6.44
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.629(1), 2.659(1), 5.3(1),

Physical Properties of Murdochite

Help on Cleavage: Cleavage: {111} Distinct, {111} Distinct, {111} Distinct
Help on Color: Color: Black.
Help on Density: Density: 5.9 - 6.7, Average = 6.3
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Octahedral Crystals - Occurs as octahedral shaped crystals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: black

Optical Properties of Murdochite

Help on Optical Data: Optical Data: Isotropic.
  NCalc= 2.08 - from Gladstone-Dale relationship (KC = 0.1681) where Ncalc=Dcalc*KC+1
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1681) where Ncalc=Dmeas*KC+1
Help on RL Color: RL Color: Gray with yellowish brown tint.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Murdochite in Air
λ R  ∑ R(λ) 
 470 nm   16.30   
 490 nm   16.40 
 510 nm   16.70 
 530 nm   16.90 
 570 nm   17.20 
 610 nm   17.50 
 630 nm   17.50 
 650 nm   17.60 
Calculated Relative Intensity Colors of Murdochite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540%

Calculated Properties of Murdochite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Murdochite =6.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEMurdochite = 446.07 barns/electron
U=PEMurdochite x rElectron Density=2,580.27 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Murdochite is Not Radioactive

Murdochite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.06)not classified
  (04.06.05)Dana Group Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 03.DB.45 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DB -With Pb, Cu, etc.
03.DB.45 Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m

Other Murdochite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Murdochite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 03.DB.45





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