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Luddenite

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Formula:
Cu2Pb2Si5O14 · 4H2O
System:
Monoclinic
Colour:
Translucent nickel green
Hardness:
4
Name:
For Raymond W. Ludden the chief geologist for Western Exploration, Phelps Dodge Corp.
This page provides mineralogical data about Luddenite.


Classification of Luddenite

Approved
9.HH.10

9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
78.7.11.1

78 : Unclassified Silicates
7 :
14.13.3

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Physical Properties of Luddenite

Colour:
Translucent nickel green
Streak:
Pale nickel green
Hardness (Mohs):
4
Density:
4.45 g/cm3 (Measured)    

Optical Data of Luddenite

Type:
Biaxial
RI values:
nα = 1.852 nγ = 1.867
2V:
Measured: 40°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
none
Comments:
gamma=rich emerald green, alpha = beta = yellow green.

Chemical Properties of Luddenite

Formula:
Cu2Pb2Si5O14 · 4H2O
IMA Formula:
Cu2Pb2Si5O14 · 14H2O
Elements listed in formula:
Common Impurities:
Ti

Crystallography of Luddenite

Crystal System:
Monoclinic
Cell Parameters:
a = 7.85 Å, b = 20.06 Å, c = 14.72 Å
β = 90.78°
Ratio:
a:b:c = 0.391 : 1 : 0.734
Unit Cell Volume:
V 2,317.76 ų (Calculated from Unit Cell)
Morphology:
Grains not exceeding 0.01 mm in size. They form in rosettes or fan-shaped aggregates closely packed together. Where individual grains can be discerned, they are scales or plates with wedge-shaped terminations.

Type Occurrence of Luddenite

Relationship of Luddenite to other Species

9.HH.05MacquartiteCu2Pb7(CrO4)4(SiO4)2(OH)2
9.HH.15CreaseyitePb2Cu2Fe23+(Si4.67Al0.33)O15.33(OH)3 · H2O
9.HH.20PlumbotsumitePb13(CO3)6(Si10O27) · 3H2O
9.HH.25MolybdophyllitePb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O
14.13.1AlamositePbSiO3
14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2O
14.13.4MolybdophyllitePb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O
14.13.5MargarosanitePb(Ca,Mn2+)2(Si3O9)
14.13.6GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
14.13.7KentrolitePb2Mn23+(Si2O7)O2
14.13.8BarysilitePb8Mn2+[Si2O7]3
14.13.9MelanotekitePb2Fe23+(Si2O7)O2
14.13.10CreaseyitePb2Cu2Fe23+(Si4.67Al0.33)O15.33(OH)3 · H2O

Other Names for Luddenite

Name in Other Languages:
German:Luddenit
Spanish:Luddenita

Other Information

Other Information:
Luddenite is not easily soluble in acids. Dissolution even in heated 50 % HNO3 was slow. It readily fuses to a runny lemon yellow slag in the closed tube.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Luddenite

Reference List:
Mineralogical Magazine (1982): 46: 363-364.

American Mineralogist (1983): 68: 643.

Internet Links for Luddenite

mindat.org URL:
https://www.mindat.org/min-2450.html
Please feel free to link to this page.

Localities for Luddenite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Salzburg
    • Hohe Tauern
      • Habach valley
        • Nasenkopf
Brandstätter, F., Hirche, T., Niedermayr, G. & Walter, F. (2010): 1638) Azurit, Brochantit, Devillin, Linarit, Luddenit (?), Malachit, Mottramit und Wulfenit sowie andere Mineralien aus der Greinerrinne im Habachtal, Salzburg. Pp. 225-227 in Niedermayr et al. (2010): Neue Mineralfunde aus Österreich LIX. Carinthia II, 200./120., 199-260.
Germany
 
  • Bavaria
    • Upper Palatinate
      • Freihung
http://www.mineralienatlas.de/forum/index.php/topic,16866.15.html
USA
 
  • Arizona
    • Maricopa Co.
      • Big Horn Mts
        • Osborn District
          • Tonopah
            • Belmont Mountain
              • Tiger Wash
    • Mohave Co.
      • Artillery Mts
        • Artillery Peak
S. A. Williams (1982) Luddenite, a New Copper-Lead Silicate from Arizona Mineralogical Magazine 1982 46 : 363-364
        • Rawhide Wash
          • Rawhide Mine area
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 104, 369; Williams, S.A. (1982), Luddenite, a new copper-lead silicate mineral from AZ, Mineralogical Magazine: 46:363-364.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 280.
Mineral and/or Locality  
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