Mineralogy Database

Luddenite Mineral Data

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General Luddenite Information

Help on Chemical  Formula: Chemical Formula: Pb2Cu2Si5O14•14(H2O)
Help on Composition: Composition: Molecular Weight = 1,158.13 gm
   Copper    10.97 %  Cu   12.36 % Cu2O
   Silicon   12.13 %  Si   25.94 % SiO2
   Hydrogen   2.44 %  H    21.78 % H2O
   Lead      35.78 %  Pb   38.54 % PbO
   Oxygen    38.68 %  O
            ______        ______ 
            100.00 %       98.62 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2Cu2Si5O14•14(H2O)
Help on Environment: Environment: Pb-Cu-Ag prospect.
Help on IMA Status: IMA Status: Approved IMA 1981
Help on Locality: Locality: Artillery Peak, Mohave County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Raymond W. Ludden, chief geologist, Phelps-Dodge Corporation.
Help on Name Pronunciation: Name Pronunciation: Luddenite + Pronunciation Say LUDDENITE

Luddenite Image

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Comments: Light green crystalline crust of luddenite in patches to 1mm on matrix with colorless micro-crystals that are possibly alamosite and wickenbergite.
Location: Rawhide mine, Artillery Peak dist., Mohave Co., Arizona, USA. Scale: Overall: 4 x 3.5 x 3.5 cm.
© Tom Loomis / Dakota Matrix

Luddenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3913:1:0.7337
Help on Cell Dimensions: Cell Dimensions: a = 7.85, b = 20.06, c = 14.72, Z = 6; beta = 90.78° V = 2,317.76 Den(Calc)= 4.98
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.173(1), 7.361(1), 2.918(0.8),

Physical Properties of Luddenite

Help on Cleavage: Cleavage: {???} Distinct
Help on Color: Color: Nickel green.
Help on Density: Density: 4.45
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fan Shaped - Occurs as radiating crystals shaped like a fan.
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 4 - Fluorite
Help on Streak: Streak: light green

Optical Properties of Luddenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.072 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.171 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1726,KPDmeas= 0.1931,KC= 0.2082
Ncalc = 1.93 - 2.04
Help on Optical Data: Optical Data: Biaxial (?), a=1.852, g=1.867, bire=0.0150, 2V(Meas)=40.
Help on Pleochroism (x): Pleochroism (x): yellow green.
Help on Pleochroism (y): Pleochroism (y): yellow green.
Help on Pleochroism (z): Pleochroism (z): emerald green.

Calculated Properties of Luddenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Luddenite =4.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.08
Boson Index = 0.92
Help on Photoelectric: Photoelectric: PELuddenite = 590.19 barns/electron
U=PELuddenite x rElectron Density=2,467.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Luddenite is Not Radioactive

Luddenite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.07)wholly unclassified silicates
  (78.07.11)Dana Group Luddenite Pb2Cu2Si5O14•14(H2O) Unk Mono
Help on  Strunz Class: Strunz Class: 09.HH.10 09 - SILICATES (Germanates)
  09.H - Unclassified Silicates
  09.HH -With Pb
09.HH.10 Luddenite Pb2Cu2Si5O14•14(H2O) Unk Mono

Other Luddenite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Luddenite :
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 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.HH.10





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