Mineralogy Database

Freedite Mineral Data

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General Freedite Information

Help on Chemical  Formula: Chemical Formula: Pb8Cu+(As+++O3)2O3Cl5
Help on Composition: Composition: Molecular Weight = 2,192.25 gm
   Copper     2.90 %  Cu    3.26 % Cu2O
   Arsenic    6.84 %  As    9.02 % As2O3
   Lead      75.61 %  Pb   81.45 % PbO
   Chlorine   8.09 %  Cl    8.09 % Cl
               -   %   Cl   -1.82 % -O=Cl2   
   Oxygen     6.57 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb8Cu(AsO3)2O3Cl5
Help on Environment: Environment: Weathered lead slags.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Laurion, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Robert L. Freed (1950-), U.S. Mineralogist.
Help on Name Pronunciation: Name Pronunciation: Freedite Say FREEDITE
Help on Synonym: Synonym: ICSD 68176
  PDF 39-326

Freedite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6755:1:0.3714
Help on Cell Dimensions: Cell Dimensions: a = 13.578, b = 20.099, c = 7.465, Z = 4; beta = 105.73° V = 1,960.94 Den(Calc)= 7.43
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.949(1), 2.734(0.8), 2.83(0.8),

Physical Properties of Freedite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Greenish yellow.
Help on Density: Density: 7
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow

Optical Properties of Freedite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.21 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.256 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1211,KPDmeas= 0.1286,KC= 0.1627
Ncalc = 2.14 - 2.21
Help on Optical Data: Optical Data: Biaxial (?), b=1.9

Calculated Properties of Freedite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.80 gm/cc
note: Specific Gravity of Freedite =7.00 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEFreedite =1,408.62 barns/electron
U=PEFreedite x rElectron Density=8,168.02 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Freedite is Not Radioactive

Freedite Classification

Help on  Dana Class: Dana Class: (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.01)where (A B)m (XO3)p Zq
  (46.01.05)Dana Group Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JB.65 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
04.JB.65 Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m

Other Freedite 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 Freedite :
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: 04.JB.65





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