Murdochite Mineral Data

Murdochite Mineral Data +

General Murdochite Information

Chemical Formula:

PbCu6O8-x(Cl,Br)2x

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

Empirical Formula:

Pb_0.9Cu_6.1O_7.5Cl_1.2Br_0.3

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.

Synonym:

ICSD 37239

PDF 28-Jul

Murdochite Image

Images:

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

Cell Dimensions:

a = 9.224, Z = 4; V = 784.80 Den(Calc)= 6.44

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.629(1), 2.659(1), 5.3(1),

Crystal Structure:

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Christ C L , Clark J R , American Mineralogist , 40 (1955) p.907-916, The crystal structure of murdochite, disordered model

View Additional jPOWD Structure files for Murdochite
[1] [2] [3] [4]

Physical Properties of Murdochite

Cleavage:

[111] Distinct, [111] Distinct, [111] Distinct

Color:

Black.

Density:

5.9 - 6.7, Average = 6.3

Diaphaniety:

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

Optical Properties of Murdochite

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

RL Color:

Gray with yellowish brown tint.

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**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%
R

Calculated Properties of Murdochite

Electron Density:

r_electron=5.78 gm/cc
note: r_Murdochite=6.44 gm/cc.

Fermion Index

Fermion Index = 0.05425
Boson Index = 0.94575

Photoelectric:

PE_Murdochite= 446.07 barns/electron
U=PE_Murdochite x r_electron=2,580.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Murdochite is Not Radioactive

Murdochite Classification

Dana Class:

4.6.5.1 (4)Simple Oxides

(4.6)not classified

(4.6.5)Dana Group

4.6.5.1 Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m

Strunz Class:

IV/A.04-70 IV - Oxides

IV/A - Oxides with metal : oxygen = 1:1 and 2:1 (M2O,MO)

IV/A.04 - Periclase Group, Periclase - Murdochite series

IV/A.04-10 Periclase MgO F m3m 4/m 3 2/m

IV/A.04-20 Wustite FeO F m3m 4/m 3 2/m

IV/A.04-30 Bunsenite NiO F m3m 4/m 3 2/m

IV/A.04-40 Manganosite MnO F m3m 4/m 3 2/m

IV/A.04-50 Monteponite CdO F m3m 4/m 3 2/m

IV/A.04-60 Lime CaO F m3m 4/m 3 2/m

IV/A.04-70 Murdochite PbCu6O8-x(Cl,Br)2x F m3m 4/m 3 2/m

Other Murdochite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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Murdochite

PbCu6O8-x(Cl,Br)2x
Dana No: 4.6.5.1 Strunz No: IV/A.04-70
Locality:

Notes: