Mineralogy Database

Ludlockite-(Pb) Mineral Data

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General Ludlockite-(Pb) Information

Help on Chemical  Formula: Chemical Formula: PbFe+++4As+++10O22
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: PbFe3+4As10O22
Help on Environment: Environment: Oxidized ore bodies containing lead, iron, and As bearing sulfosalts.
Help on IMA Status: IMA Status: Not Approved IMA 1977
Help on Locality: Locality: In a boulder of ore found at Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for mineral dealers Ludlow Smith and Locke Key, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Ludlockite-(Pb) + Pronunciation Say LUDLOCKITE-(PB)
Help on Synonym: Synonym: Ludlockite

Ludlockite-(Pb) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8635:1:1.5197
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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)

Help on Cleavage: Cleavage: {011} Perfect, {021} Perfect
Help on Color: Color: Reddish brown.
Help on Density: Density: 4.37 - 4.4, Average = 4.38
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Hardness: Hardness: 1.5-2 - Talc-Gypsum
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: pale brown

Optical Properties of Ludlockite-(Pb)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=1.96, b=2.055, g=2.11, bire=0.1500

Calculated Properties of Ludlockite-(Pb)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.96 gm/cc
note: Specific Gravity of Ludlockite-(Pb) =4.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PELudlockite-(Pb) = 269.51 barns/electron
U=PELudlockite-(Pb) x rElectron Density=1,067.76 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ludlockite-(Pb) is Not Radioactive

Ludlockite-(Pb) Classification

Help on  Dana Class: Dana Class: (45)Acid and normal Antimonites, Arsenites and Phosphites
  (45.01)with miscellaneous formulae
  (45.01.14)Dana Group Ludlockite-(Pb)* PbFe4As10O22 P1 1
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 04.JA.45





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