Mineralogy Database

Ludlockite Mineral Data

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General Ludlockite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Pb)As+++++2O6
Help on Composition: Composition: Molecular Weight = 309.25 gm
   Iron     17.16 %  Fe   22.07 % FeO
   Arsenic  48.45 %  As   74.32 % As2O5
   Lead      3.35 %  Pb    3.61 % PbO
   Oxygen   31.04 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+0.95Pb0.05As2O6
Help on Environment: Environment: Oxidized ore bodies containing lead, iron, and As bearing sulfosalts. Found with zincian siderite in the "germanite section" at Tsumeb.
Help on IMA Status: IMA Status: Approved IMA 1970
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 F. Ludlow Smith III and C. Locke Key, mineral collectors and dealers in New Jersy.
Help on Name Pronunciation: Name Pronunciation: Ludlockite + Pronunciation Say LUDLOCKITE
Help on Synonym: Synonym: ICSD 82486
  PDF 29-774

Ludlockite Image

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Comments: Acicular crystals of red-orange ludlockite on quartz and chalcocite.
Location: Tsumeb Mine, Tsumeb, Namibia. Scale: Crystal size 0.4 cm.
© John Veevaert

Ludlockite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.846:1:0.8251
Help on Cell Dimensions: Cell Dimensions: a = 10.11, b = 11.95, c = 9.86, Z = 9; alpha = 113.9°, beta = 99.7°, gamma = 82.74° V = 1,064.91 Den(Calc)= 4.34
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: A1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.81(1), 2.94(0.9), 2.86(0.7),3.16(0.7), 3.33(0.7), 4.47(0.6), 4.74(0.6), 10.9(0.6), 3.33(0.4),

Physical Properties of Ludlockite

Help on Cleavage: Cleavage: {011} Good, {???} Good
Help on Color: Color: Copper red.
Help on Density: Density: 4.35 - 4.4, Average = 4.37
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
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: light brown

Optical Properties of Ludlockite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.428 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.45 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2417,KPDmeas= 0.2381,KC= 0.1667
Ncalc = 1.72 - 1.73
Help on Optical Data: Optical Data: Biaxial (+), a=1.96, b=2.055, g=2.11, bire=0.1500
Help on Pleochroism (x): Pleochroism (x): yellow.
Help on Pleochroism (y): Pleochroism (y): deep yellow.
Help on Pleochroism (z): Pleochroism (z): orange yellow.

Calculated Properties of Ludlockite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.04 gm/cc
note: Specific Gravity of Ludlockite =4.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELudlockite = 95.04 barns/electron
U=PELudlockite x rElectron Density= 383.99 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ludlockite is Not Radioactive

Ludlockite Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.05)with miscellaneous formulae
  (38.05.04)Dana Group Ludlockite (Fe,Pb)As2O6 A1 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 Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Ludlockite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Dana No: Strunz No: 04.JA.45





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