Fiedlerite Mineral Data

Fiedlerite Mineral Data +

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General Fiedlerite Information

Chemical Formula:

Pb3Cl4F(OH)2

Composition:

Molecular Weight = 816.42 gm

Hydrogen 0.25 % H 2.21 % H₂O

Lead 76.14 % Pb 82.02 % PbO

Chlorine 17.37 % Cl 17.37 % Cl

- % Cl -3.92 % -O=Cl₂

Oxygen 3.92 % O

Fluorine 2.33 % F 2.33 % F

- % F -0.98 % -O=F₂

______ ______

100.00 % 99.02 % = TOTAL OXIDE

Empirical Formula:

Pb₃Cl₄F(OH)₂

Environment:

Secondary mineral from smelting activities.

IMA Status:

Valid Species (Pre-IMA) 1887

Locality:

Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for K.G. Fiedler, superintendant of the Laurion mines.

Fiedlerite Image

Images:

Fiedlerite

Comments: Clear tabular crystals of fiedlerite on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Fiedlerite Crystallography

Axial Ratios:

a:b:c =1.0657:1:0.9044

Cell Dimensions:

a = 8.574, b = 8.045, c = 7.276, Z = 2; alpha = 89.96°, beta = 102.05°, gamma = 103.45° V = 477.36 Den(Calc)= 5.68

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.55(1), 3.89(1), 2.81(0.8),

Forms:

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Forms: [ 2 1 0] [ 2 0 1] [ 2 1 1] [ 3 1 0] [ 1 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Merlino S , Pasero M , Perchiazzi N , Mineralogical Magazine , 58 (1994) p.69-78, Fiedlerite: revised chemical formula, [Pb3Cl4F(OH)*H2O], OD description and crystal, structure refinement of the two MDO polytypes, Locality: Baratti, Italy, Note: 1A polytype

View Additional jPOWD Structure files for Fiedlerite
[1]

Physical Properties of Fiedlerite

Cleavage:

[001] Distinct, [100] Distinct

Color:

Colorless, White.

Density:

5.88

Diaphaniety:

Translucent

Hardness:

3.5 - Copper Penny

Luster:

Adamantine

Streak:

white

Optical Properties of Fiedlerite

Gladstone-Dale:

CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1831,KPDmeas= 0.1769,KC= 0.1726

Optical Data:

Biaxial (-), a=1.98, b=2.04, g=2.1, bire=0.1200

Calculated Properties of Fiedlerite

Electron Density:

r_electron=4.91 gm/cc
note: r_Fiedlerite=5.88 gm/cc.

Fermion Index

Fermion Index = 0.16828
Boson Index = 0.83172

Photoelectric:

PE_Fiedlerite=1,400.49 barns/electron
U=PE_Fiedlerite x r_electron=6,878.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Fiedlerite is Not Radioactive

Fiedlerite Classification

Dana Class:

10.3.2.1 (10)Oxyhalides and Hydroxyhalides

(10.3)where (A)3 (O,OH)2 Xq

(10.3.2)Dana Group

10.3.2.1 Fiedlerite Pb3Cl4F(OH)2 P1 1

Strunz Class:

III/D.10-10 III - Halogenides

III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds

III/D.10 - Cotunnite - Matlockite series

III/D.10-10 Fiedlerite Pb3Cl4F(OH)2 P1 1

III/D.10-20 Paralaurionite PbCl(OH) C 2/m 2/m

III/D.10-30 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m

III/D.10-40 Cotunnite PbCl2 Pnam 2/m 2/m 2/m

III/D.10-50 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m

III/D.10-60 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

III/D.10-65 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

III/D.10-70 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

III/D.10-80 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

III/D.10-90 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

III/D.10-140 Symesite! Pb10(SO4)O7Cl4·(H2O) B1 1

Other Fiedlerite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Fiedlerite

Pb3Cl4F(OH)2
Dana No: 10.3.2.1 Strunz No: III/D.10-10
Locality:

Notes: