Luddenite Mineral Data

General Luddenite Information

Chemical Formula:

Pb2Cu2Si5O14•14(H2O)

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

Empirical Formula:

Pb₂Cu₂Si₅O₁₄•14(H₂O)

Environment:

Pb-Cu-Ag prospect.

IMA Status:

Approved IMA 1981

Locality:

Artillery Peak, Mohave County, Arizona, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Raymond W. Ludden, chief geologist, Phelps-Dodge Corporation.

Name Pronunciation:

Luddenite + Pronunciation

Luddenite Image

Images:

Luddenite

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

Axial Ratios:

a:b:c =0.3913:1:0.7337

Cell Dimensions:

a = 7.85, b = 20.06, c = 14.72, Z = 6; beta = 90.78° V = 2,317.76 Den(Calc)= 4.98

Crystal System:

Monoclinic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.173(1), 7.361(1), 2.918(0.8),

Physical Properties of Luddenite

Cleavage:

{???} Distinct

Color:

Nickel green.

Density:

4.45

Diaphaneity:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4 - Fluorite

Streak:

light green

Optical Properties of Luddenite

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

Optical Data:

Biaxial (?), a=1.852, g=1.867, bire=0.0150, 2V(Meas)=40.

Pleochroism (x):

yellow green.

Pleochroism (y):

yellow green.

Pleochroism (z):

emerald green.

Calculated Properties of Luddenite

Electron Density:

Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Luddenite =4.45 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Luddenite= 590.19 barns/electron
U=PE_Luddenite x rElectron Density=2,467.32 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Luddenite is Not Radioactive

Luddenite Classification

Dana Class:

78.07.11.01 (78)Unclassified silicates

(78.07)wholly unclassified silicates

(78.07.11)Dana Group

78.07.11.01 Luddenite Pb2Cu2Si5O14•14(H2O) Unk Mono

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Print or Cut-and-Paste your Luddenite Specimen Label here :

Luddenite

Pb2Cu2Si5O14•14(H2O)
Dana No: 78.07.11.01 Strunz No: 09.HH.10
Locality:

Notes:

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