Ludlockite-(Pb) Mineral Data

General Ludlockite-(Pb) Information

Chemical Formula:

PbFe+++4As+++10O22

Composition:

Molecular Weight = 1,531.79 gm

Iron 14.58 % Fe 20.85 % Fe₂O₃

Arsenic 48.91 % As 64.58 % As₂O₃

Lead 13.53 % Pb 14.57 % PbO

Oxygen 22.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe³⁺₄As₁₀O₂₂

Environment:

Oxidized ore bodies containing lead, iron, and As bearing sulfosalts.

IMA Status:

Not Approved IMA 1977

Locality:

In a boulder of ore found at Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for mineral dealers Ludlow Smith and Locke Key, who discovered the mineral.

Name Pronunciation:

Ludlockite-(Pb) + Pronunciation

Synonym:

Ludlockite

Ludlockite-(Pb) Crystallography

Axial Ratios:

a:b:c =0.8635:1:1.5197

Cell Dimensions:

a = 10.426, b = 12.074, c = 18.349, Z = 4; alpha = 101.84°, beta = 100.21°, gamma = 90.6° V = 2,224.77 Den(Calc)= 4.57

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 8.81(1), 2.94(0.9), 10.9(0.9),2.86(0.7), 3.16(0.7), 3.33(0.7), 4.47(0.6), 4.74(0.6),

Physical Properties of Ludlockite-(Pb)

Cleavage:

{011} Perfect, {021} Perfect

Color:

Reddish brown.

Density:

4.37 - 4.4, Average = 4.38

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

1.5-2 - Talc-Gypsum

Luster:

Subadamantine

Streak:

pale brown

Optical Properties of Ludlockite-(Pb)

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2376,KC= 0.2368
Ncalc = 2.03 - 2.08

Optical Data:

Biaxial (+), a=1.96, b=2.055, g=2.11, bire=0.1500

Calculated Properties of Ludlockite-(Pb)

Electron Density:

Bulk Density (Electron Density)=3.96 gm/cc
note: Specific Gravity of Ludlockite-(Pb) =4.39 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Ludlockite-(Pb)}= 269.51 barns/electron
U=PE_{Ludlockite-(Pb)} x rElectron Density=1,067.76 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ludlockite-(Pb) is Not Radioactive

Ludlockite-(Pb) Classification

Dana Class:

45.01.14.01 (45)Acid and normal Antimonites, Arsenites and Phosphites

(45.01)with miscellaneous formulae

(45.01.14)Dana Group

45.01.14.01 Ludlockite-(Pb)* PbFe4As10O22 P1 1

Strunz Class:

04.JA.45 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JA -Arsenites, antimonites, bismuthites; without additional anions, without H2O

04.JA.45 Ludlockite (Fe,Pb)As2O6 A1 1

04.JA.45 Ludlockite-(Pb)* PbFe4As10O22 P1 1

Other Ludlockite-(Pb) Information

References:

NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Ludlockite-(Pb) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Ludlockite-(Pb) Specimen Label here :

Ludlockite-(Pb)

PbFe+++4As+++10O22
Dana No: 45.01.14.01 Strunz No: 04.JA.45
Locality:

Notes:

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