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Murdochite Mineral Data
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General Murdochite Information
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 Chemical Formula: |
PbCu6O8-x(Cl,Br)2x |
| Composition: |
Molecular Weight = 760.62 gm |
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Copper 50.96 % Cu 63.79 % CuO |
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Lead 24.52 % Pb 26.41 % PbO |
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Bromine 3.15 % Br 3.15 % Br |
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- %
Br -0.32 % -O=Br2 |
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Chlorine 5.59 % Cl 5.59 % Cl |
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- %
Cl -1.26 % -O=Cl2 |
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Oxygen 15.78 % O |
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______ ______ |
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100.00 % 97.37 % = TOTAL OXIDE |
| Empirical Formula: |
Pb0.9Cu6.1O7.5Cl1.2Br0.3 |
| Environment: |
Oxidized Pb-Cu deposits. |
| IMA Status: |
Valid Species (Pre-IMA) 1955 |
| Locality: |
Mammoth-St. Anthony mine, Tiger, Pinal County, Arizona, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Joseph Murdock (1890-1973), American mineralogist, University of California, Los Angeles, California, USA. |
| Name Pronunciation: |
Murdochite + Pronunciation  |
| Synonym: |
ICSD 37239 |
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PDF 28-Jul |
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Murdochite Image |
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Images:
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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 |
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Murdochite Crystallography
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| Cell Dimensions: |
a = 9.224, Z = 4; V = 784.80 Den(Calc)= 6.44 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F m3m |
| X Ray Diffraction: |
By Intensity(I/Io): 1.629(1), 2.659(1), 5.3(1), |
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Physical Properties of Murdochite
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| Cleavage: |
{111} Distinct, {111} Distinct, {111} Distinct |
| Color: |
Black. |
| Density: |
5.9 - 6.7, Average = 6.3 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Octahedral Crystals - Occurs as octahedral shaped crystals. |
| Hardness: |
4 - Fluorite |
| Luster: |
Sub Metallic |
| Streak: |
black |
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Optical Properties of Murdochite
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| Optical Data: |
Isotropic. |
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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
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| RL Color: |
Gray with yellowish brown tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Murdochite in Air
| λ |
R |
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∑ R(λ) |
| 470 nm |
16.30 |
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| 490 nm |
16.40 |
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| 510 nm |
16.70 |
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| 530 nm |
16.90 |
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| 570 nm |
17.20 |
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| 610 nm |
17.50 |
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| 630 nm |
17.50 |
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| 650 nm |
17.60 |
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Calculated Relative Intensity Colors of Murdochite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
| R |
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Calculated Properties of Murdochite
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| Electron Density: |
Bulk Density (Electron Density)=5.78 gm/cc
note: Specific Gravity of Murdochite =6.44 gm/cc.
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| Fermion Index: |
Fermion Index = 0.05
Boson Index = 0.95 |
| Photoelectric: |
PEMurdochite = 446.07 barns/electron
U=PEMurdochite x rElectron Density=2,580.27 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Murdochite is Not Radioactive |
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Murdochite Classification
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| Dana Class: |
04.06.05.01 (04)Simple Oxides |
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(04.06)not classified |
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(04.06.05)Dana Group |
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04.06.05.01 Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m |
| Strunz Class: |
03.DB.45 03 - HALIDES |
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03.D - Oxyhalides, Hydroxyhalides and Related Double Halides |
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03.DB -With Pb, Cu, etc. |
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03.DB.45 Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m |
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Other Murdochite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| 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
15 - WWW-MINCRYST
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Murdochite
PbCu6O8-x(Cl,Br)2x
Dana No: 04.06.05.01 Strunz No: 03.DB.45
Locality:
Notes:
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