Mineralogy Database

Nealite Mineral Data

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General Nealite Information

Help on Chemical  Formula: Chemical Formula: Pb4Fe++(As+++++O4)2Cl4
Help on Composition: Composition: Molecular Weight = 1,304.30 gm
   Iron       4.28 %  Fe    5.51 % FeO
   Arsenic   11.49 %  As   17.62 % As2O5
   Lead      63.54 %  Pb   68.45 % PbO
   Chlorine  10.87 %  Cl   10.87 % Cl
               -   %   Cl   -2.45 % -O=Cl2   
   Oxygen     9.81 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb4Fe2+(AsO4)2Cl4
Help on Environment: Environment: Lead slags.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Laurion, Attica, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named of Leo Neal Yedlin (1908-1997), micromount mineral collector of New Haven, Connecticut, USA.
Help on Name Pronunciation: Name Pronunciation: Nealite Say NEALITE
Help on Synonym: Synonym: ICSD 74191
  PDF 33-755

Nealite Image

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Comments: Orange-yellow prismatic crystals of Nealite on matrix.
Location: Lavrion District slag localities, Attikí (Attica; Attika) Prefecture, Greece. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Nealite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6384:1:0.5457
Help on Cell Dimensions: Cell Dimensions: a = 6.537, b = 10.239, c = 5.588, Z = 1; alpha = 96.2°, beta = 89.39°, gamma = 97.74° V = 368.42 Den(Calc)= 5.88
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.542(1), 6.48(0.8), 4.237(0.7),

Physical Properties of Nealite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow, Light orange.
Help on Density: Density: 5.88
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: light orange

Optical Properties of Nealite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1701,KPDmeas= 0.1701,KC= 0.1643
Ncalc = 1.97
Help on Optical Data: Optical Data: Biaxial (?), b=2
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.

Calculated Properties of Nealite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.98 gm/cc
note: Specific Gravity of Nealite =5.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.14
Boson Index = 0.86
Help on Photoelectric: Photoelectric: PENealite =1,163.50 barns/electron
U=PENealite x rElectron Density=5,790.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nealite is Not Radioactive

Nealite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.04)where (A B)5 (XO4)2 Zq
  (41.04.06)Dana Group Nealite Pb4Fe(AsO4)2Cl4 P1 1
Help on  Strunz Class: 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 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 Nealite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
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.JD.05





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