Freedite Mineral Data

Freedite Mineral Data +

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General Freedite Information

Chemical Formula:

Pb8Cu+(As+++O3)2O3Cl5

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

Empirical Formula:

Pb₈Cu(AsO₃)₂O₃Cl₅

Environment:

Weathered lead slags.

IMA Status:

Approved IMA 1985

Locality:

Laurion, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for Robert L. Freed (1950-), U.S. Mineralogist.

Synonym:

ICSD 68176

PDF 39-326

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Freedite Crystallography

Axial Ratios:

a:b:c =0.6755:1:0.3714

Cell Dimensions:

a = 13.578, b = 20.099, c = 7.465, Z = 4; beta = 105.73° V = 1,960.94 Den(Calc)= 7.43

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.949(1), 2.734(0.8), 2.83(0.8),

Crystal Structure:

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Pertlik F , Mineralogy and Petrology , 36 (1987) p.85-92, The structure of freedite, Pb8Cu(AsO3)2O3Cl5, Locality: Langban mine, Varmland, Sweden

Physical Properties of Freedite

Cleavage:

[100] Perfect

Color:

Greenish yellow.

Density:

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

yellow

Optical Properties of Freedite

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

Optical Data:

Biaxial (?), b=1.9

Calculated Properties of Freedite

Electron Density:

r_electron=5.80 gm/cc
note: r_Freedite=7.00 gm/cc.

Fermion Index

Fermion Index = 0.16713
Boson Index = 0.83287

Photoelectric:

PE_Freedite=1,408.62 barns/electron
U=PE_Freedite x r_electron=8,168.02 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Freedite is Not Radioactive

Freedite Classification

Dana Class:

46.1.5.1 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites

(46.1)where (A B)m (XO3)p Zq

(46.1.5)Dana Group

46.1.5.1 Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m

Strunz Class:

IV/J.03-20 IV - Oxides

IV/J - Arsenides with [AsO3]3- groups

IV/J.03 - Finnemanite - Nealite series

IV/J.03-10 Finnemanite Pb5(AsO3)3Cl P 6₃ 6

IV/J.03-20 Freedite Pb8Cu(AsO3)2O3Cl5 C 2/m 2/m

IV/J.03-30 Trigonite Pb3Mn(AsO3)2(AsO2OH) Pn m

IV/J.03-40 Rouseite Pb2Mn(AsO3)2·2(H2O) P1,P 1 Tri

IV/J.03-50 Nealite Pb4Fe(AsO4)2Cl4 P1 1

Other Freedite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Freedite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Freedite

Pb8Cu+(As+++O3)2O3Cl5
Dana No: 46.1.5.1 Strunz No: IV/J.03-20
Locality:

Notes: