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Nealite

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Formula:
Pb
 
4
Fe
2+
 
(As
3+
 
O
 
3
)
 
2
Cl
 
4
· 2H
 
2
O
System:TriclinicColour:Yellow brown to orange ...
Hardness:4
Name:
Named by Pete Dunn and Roland Rouse in 1980 for Leo Neal Yedlin (March 20, 1908 - October, 1977), U. S. author and Mineralogist, who discovered the mineral.


Bladed yellow brown to orange brown crystals.

Classification of Nealite

IMA status:Approved
Strunz 8th edition ID:4/J.03-50
Nickel-Strunz 10th (pending) edition ID:4.JD.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
D : Arsenites, antimonites, bismuthites; with additional anions, with H2O
Dana 8th edition ID:46.1.6.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO3)pZq
Hey's CIM Ref.:22.2.18

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride
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Type Occurrence of Nealite

Type Locality:Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece
Year of Discovery:1980
Geological Setting of type material:Ancient refinery slags which interacted with sea water

Physical Properties of Nealite

Lustre:Adamantine, Vitreous, Sub-Vitreous
Diaphaneity (Transparency):Transparent
Colour:Yellow brown to orange brown
Streak:Pale yellow to pale orange
Hardness (Mohs):4
Tenacity:Very brittle
Cleavage:None Observed
Fracture:Irregular/Uneven
Density (calculated):5.89 g/cm3

Crystallography of Nealite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 6.53Å, b = 10.23Å, c = 5.58Å
α = 96.41°, β = 89.52°, γ = 97.82°
Ratio:a:b:c = 0.638 : 1 : 0.545
Unit Cell Volume:V 366.97 ų (Calculated from Unit Cell)
Z:1
X-Ray Powder Diffraction:
d-spacingIntensity
10.09 (60)
6.48 (80)
4.24 (70)
3.92 (50)
3.54 (100)
3.25 (60)
2.97 (50)
2.78 (60)
Comments:33-0755

Optical Data of Nealite

Type:Biaxial
Dispersion:relatively weak
Pleochroism:Non-pleochroic

Chemical Properties of Nealite

Formula:
Pb
 
4
Fe
2+
 
(As
3+
 
O
 
3
)
 
2
Cl
 
4
· 2H
 
2
O
Essential elements:As, Cl, Fe, H, O, Pb
All elements listed in formula:As, Cl, Fe, H, O, Pb

Relationship of Nealite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.JD.10Seelite
Mg(UO
 
2
)(As
3+
 
O
 
3
)
 
0.7
(AsO
 
4
)
 
0.3
· 7H
 
2
O
4.JD.15Tooeleite
Fe
3+
6
(As
3+
 
O
 
3
)
 
4
(SO
 
4
)(OH)
 
4
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.2.1Sampleite
NaCaCu
 
5
(PO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.2Lavendulan
NaCaCu
 
5
(AsO
 
4
)
 
4
Cl · 5H
 
2
O
22.2.3Chlorapatite
Ca
 
5
(PO
 
4
)
 
3
Cl
22.2.4Turneaureite
Ca
 
5
(AsO
 
4
)
 
3
Cl
22.2.5Shubnikovite
Ca
 
2
Cu
 
8
(AsO
 
4
)
 
6
(OH)Cl · 7H
 
2
O
22.2.6Richelsdorfite
Ca
 
2
Cu
 
5
Sb(AsO
 
4
)
 
4
(OH)
 
6
Cl · 6H
 
2
O
22.2.7Alforsite
Ba
 
5
(PO
 
4
)
 
3
Cl
22.2.8Morelandite
Ca
 
2
Ba
 
3
(AsO
 
4
)
 
3
Cl
22.2.9Pyromorphite
Pb
 
5
(PO
 
4
)
 
3
Cl
22.2.10Mimetite
Pb
 
5
(AsO
 
4
)
 
3
Cl
22.2.11Mimetite-M
Pb
 
5
(AsO
 
4
)
 
3
Cl
22.2.12Sahlinite
Pb
 
14
(AsO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.13Georgiadèsite
Pb
 
4
(AsO
 
3
)Cl
 
4
(OH)
22.2.14Vanadinite
Pb
 
5
(VO
 
4
)
 
3
Cl
22.2.15Kombatite
Pb
 
14
(VO
 
4
)
 
2
O
 
9
Cl
 
4
22.2.16Leningradite
PbCu
 
3
(VO
 
4
)
 
2
Cl
22.2.17Hedyphane
Pb
 
3
Ca
 
2
(AsO
 
4
)
 
3
Cl

Other Names for Nealite

Synonyms:
IMA1979-050Nealite-(H2O)
Other Languages:
German:Nealit
Russian:Нилит
Spanish:Nealita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Nealite

Reference List:

- +
Dunn, P. J. & Rouse, R. C. (1980): Nealite: a new mineral from Laurion Greece. Mineralogical Record 11, 299-301.

Guiseppetti, G., Mazzi, F., Tadini, C. (1993): The crystal structure of nealite. Neues Jahrbuch für Mineralogie, Monatshefte 1993, 278-288.

Pertlik, F. & Schnorrer, G. (1993): A re-appraisal of the chemical formula of nealite,Pb4Fe(AsO3)2Cl4.2H2O, on the basis of a crystal structure determination. Mineralogy & Petrology 48, 193-200.

American Mineralogist (1994): 79: 391.

Internet Links for Nealite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Nealite details from Handbook of Mineralogy (PDF)
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  • Localities for Nealite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    France
     
    • Brittany
      • Côtes-d'Armor
        • Callac
          • Carnoët
            • Menez-Plom
    P. Le Roch collection
    Germany
     
    • Lower Saxony
      • Harz
        • Goslar
          • Astfeld
    No reference listed
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
    Min.Rec.(1980) 11, 299-301; Schnorrer-Köhler, G., Standfuss, K. & Standfuss, L. (1981): Neufunde von Mineralen aus den antiken Bleischlacken Laurions. Der Aufschluss, 32, 165-169.; Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996): Laurion: The Minerals in the Ancient Slags
          • Oxygon area
    No reference listed
          • Passa Limani area
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals of the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Sounion area
    Fritz Schreiber collection (SXRD-analysed by Uwe Kolitsch)
    Bonifazi Marco, Marius Utens and Fritz Schreiber collections; van Kalmthout, P. (2012): De slakkenmineralen van Lavrion (Gr.) - Ontwikkelingen na 1996, inclusief een archeologische ontdekking. GEA, 45 (1), 14-19 (in Dutch).
          • Thorikos area
    Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
          • Vrissaki area
    Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
    Italy
     
    • Liguria
      • Genova Province
        • Genova
          • Varenna Valley
    Rivista Mineralogica Italiana, 22 (3), 39-41.
    • Tuscany
      • Livorno Province
        • Piombino
    Muenchener Micromounter-Lithothek
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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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