Nealite-(H2O) Mineral Data

General Nealite-(H2O) Information

Chemical Formula:

Pb4Fe++(As+++O3)2Cl4•2(H2O)

Composition:

Molecular Weight = 1,308.33 gm

Iron 4.27 % Fe 5.49 % FeO

Arsenic 11.45 % As 15.12 % As₂O₃

Hydrogen 0.31 % H 2.75 % H₂O

Lead 63.35 % Pb 68.24 % PbO

Chlorine 10.84 % Cl 10.84 % Cl

- % Cl -2.45 % -O=Cl₂

Oxygen 9.78 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₄Fe²⁺(AsO₃)₂Cl₄•2(H₂O)

Environment:

Weathered lead slag.

IMA Status:

Not Approved IMA 1980

Locality:

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

Name Origin:

Named for Neal Yedlin (1908-1977), U. S. Mineralogist, who discovered the mineral.

Name Pronunciation:

Nealite-(H2O)

Nealite-(H2O) Image

Images:

Nealite-(H2O)

Comments: Orange crystals of nealite-(H2O) on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Nealite-(H2O) Crystallography

Axial Ratios:

a:b:c =0.6392:1:0.5454

Cell Dimensions:

a = 6.548, b = 10.243, c = 5.587, Z = 1; alpha = 96.2°, beta = 89.6°, gamma = 97.7° V = 369.17 Den(Calc)= 5.88

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.54(1), 6.48(0.8), 4.24(0.7),2.78(0.6), 3.25(0.6), 10.09(0.6), 2.97(0.5), 3.92(0.5),

Physical Properties of Nealite-(H2O)

Cleavage:

None

Color:

Bright orange.

Density:

5.89

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Adamantine

Streak:

pale orange

Optical Properties of Nealite-(H2O)

Gladstone-Dale:

CI meas= 0.058 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.056 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1701,KPDmeas= 0.1698,KC= 0.1802
Ncalc = 2.06

Optical Data:

Biaxial (?), b=2

Calculated Properties of Nealite-(H2O)

Electron Density:

Bulk Density (Electron Density)=5.00 gm/cc
note: Specific Gravity of Nealite-(H2O) =5.88 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_{Nealite-(H2O)}=1,155.13 barns/electron
U=PE_{Nealite-(H2O)} x rElectron Density=5,772.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nealite-(H2O) is Not Radioactive

Nealite-(H2O) Classification

Dana Class:

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

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

(46.01.06)Dana Group

46.01.06.01 Nealite-(H2O)* Pb4Fe(AsO3)2Cl4•2(H2O) P1 1

Strunz Class:

04.JD.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JD -Arsenites, antimonites, bismuthites; with additional anions, with H2O

04.JD.05 Nealite Pb4Fe(AsO4)2Cl4 P1 1

04.JD.05 Nealite-(H2O)* Pb4Fe(AsO3)2Cl4•2(H2O) P1 1

Other Nealite-(H2O) Information

References:

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

See Also:

Links to other databases for Nealite-(H2O) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Nealite-(H2O) Specimen Label here :

Nealite-(H2O)

Pb4Fe++(As+++O3)2Cl4•2(H2O)
Dana No: 46.01.06.01 Strunz No: 04.JD.05
Locality:

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