Nealite Mineral Data

Nealite Mineral Data +

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General Nealite Information

Chemical Formula:

Pb4Fe++(As+++++O4)2Cl4

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

Empirical Formula:

Pb₄Fe²⁺(AsO₄)₂Cl₄

Environment:

Lead slags.

IMA Status:

Approved IMA 1980

Locality:

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

Name Origin:

Named of Leo Neal Yedlin (1908-1997), micromount mineral collector of New Haven, Connecticut, USA.

Synonym:

ICSD 74191

PDF 33-755

Nealite Image

Images:

Nealite

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

Nealite Crystallography

Axial Ratios:

a:b:c =0.6384:1:0.5457

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

Crystal System:

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

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

By Intensity(I/I_o): 3.542(1), 6.48(0.8), 4.237(0.7),

Crystal Structure:

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Giuseppetti G , Mazzi F , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1993 (1993) p.278-288, The crystal structure of nealite: Pb4Fe(AsO3)2Cl4*2H2O, Locality: Laurion, Greece

View Additional jPOWD Structure files for Nealite
[1]

Physical Properties of Nealite

Cleavage:

None

Color:

Yellow, Light orange.

Density:

5.88

Diaphaniety:

Translucent

Fracture:

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

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

light orange

Optical Properties of Nealite

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

Optical Data:

Biaxial (?), b=2

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

none.

Calculated Properties of Nealite

Electron Density:

r_electron=4.98 gm/cc
note: r_Nealite=5.88 gm/cc.

Fermion Index

Fermion Index = 0.14138
Boson Index = 0.85862

Photoelectric:

PE_Nealite=1,163.50 barns/electron
U=PE_Nealite x r_electron=5,790.77 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nealite is Not Radioactive

Nealite Classification

Dana Class:

41.4.6.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.4)where (A B)5 (XO4)2 Zq

(41.4.6)Dana Group

41.4.6.1 Nealite Pb4Fe(AsO4)2Cl4 P1 1

Strunz Class:

IV/J.03-50 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 Nealite Information

References:

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

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

Nealite

Pb4Fe++(As+++++O4)2Cl4
Dana No: 41.4.6.1 Strunz No: IV/J.03-50
Locality:

Notes: