Ludlockite-(Pb) Mineral Data

Ludlockite-(Pb) Mineral Data +

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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.

Synonym:

Ludlockite

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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 - PinacoidalH-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= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2279,KPDmeas= 0.2376,KC= 0.2368

Optical Data:

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

Calculated Properties of Ludlockite-(Pb)

Electron Density:

r_electron=3.96 gm/cc
note: r_{Ludlockite-(Pb)}=4.39 gm/cc.

Fermion Index

Fermion Index = 0.03309
Boson Index = 0.96691

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ludlockite-(Pb) is Not Radioactive

Ludlockite-(Pb) Classification

Dana Class:

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

(45.1)with miscellaneous formulae

(45.1.14)Dana Group

45.1.14.1 Ludlockite-(Pb) * PbFe4As10O22 P1 1

Strunz Class:

IV/J.07-20* IV - Oxides

IV/J - Arsenides with [AsO3]3-, [AsO2]-, [As2O5]4- groups and unclassified Arsenides

IV/J.07 - Karibibite - Ludlockite series

IV/J.07-10 Karibibite Fe2As4(O,OH)9 Unk Ortho

IV/J.07-20 Ludlockite (Fe,Pb)As2O6 A1 1

IV/J.07-20* 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Ludlockite-(Pb)

PbFe+++4As+++10O22
Dana No: 45.1.14.1 Strunz No: IV/J.07-20*
Locality:

Notes: