Ludlockite Mineral Data + 
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- 38.5.4.1 Ludlockite (Fe,Pb)As2O6 A1 1
- 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
General Ludlockite Information |
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 Chemical Formula: |
(Fe++,Pb)As+++++2O6 | ||
| 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 | |||
| Empirical Formula: |
Fe2+0.95Pb0.05As2O6 | ||
| Environment: |
Oxidized ore bodies containing lead, iron, and As bearing sulfosalts. Found with zincian siderite in the "germanite section" at Tsumeb. | ||
| IMA Status: |
Approved IMA 1970 | ||
| Locality: |
In a boulder of ore found at Tsumeb, Namibia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for F. Ludlow Smith III and C. Locke Key, mineral collectors and dealers in New Jersy. | ||
| Synonym: |
ICSD 82486 | ||
| Ludlockite-Pb | |||
| PDF 29-774 | |||
Ludlockite Image | |||
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Images:
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Ludlockite Crystallography |
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| Axial Ratios: |
a:b:c =0.846:1:0.8251 | ||
| 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 | ||
| Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: A1 | ||
| 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), | ||
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Crystal Structure:
Mouse |
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Physical Properties of Ludlockite |
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| Cleavage: |
[011] Good, [???] Good | ||
| Color: |
Copper red. | ||
| Density: |
4.35 - 4.4, Average = 4.37 | ||
| Fracture: |
Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite). | ||
| Habit: |
Acicular - Occurs as needle-like crystals. | ||
| Hardness: |
1.5-2 - Talc-Gypsum | ||
| Luster: |
Subadamantine | ||
| Streak: |
light brown | ||
Optical Properties of Ludlockite |
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| Gladstone-Dale: |
CI meas= -0.428 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.44 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.24,KPDmeas= 0.2381,KC= 0.1667 |
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| Optical Data: |
Biaxial (+), a=1.96, b=2.055, g=2.11, bire=0.1500 | ||
| Pleochroism (x): |
yellow. | ||
| Pleochroism (y): |
deep yellow. | ||
| Pleochroism (z): |
orange yellow. | ||
Calculated Properties of Ludlockite |
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| Electron Density: |
relectron=4.04 gm/cc |
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| Fermion Index |
Fermion Index = 0.01118 Boson Index = 0.98882 |
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| Photoelectric: |
PELudlockite = 95.04 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Ludlockite is Not Radioactive |
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Ludlockite Classification |
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| Dana Class: |
38.5.4.1 (38)Anhydrous Phosphates, etc | ||
| (38.5)with miscellaneous formulae | |||
| (38.5.4)Dana Group | |||
| 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 | |||
Other Ludlockite Information |
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) | ||
| See Also: |
Links to other databases for Ludlockite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 - HyperPhysics 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Ludlockite using: Visit our Advertisers for Ludlockite : Translate Ludlockite Mineral Data : Ask about Ludlockite here : Print or Cut-and-Paste your Ludlockite Specimen Label here :
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