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Nealite

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Vrissaki Point slag locality, Vrissaki area, Lavrion District slag localities, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, Greece
© Christian Rewitzer

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Formula:
Pb
 
4
Fe
2+
 
[Cl
 
2
|AsO
 
3
]
 
2
 · 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)
Comments:33-0755

Optical Data of Nealite

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

Chemical Properties of Nealite

Formula:
Pb
 
4
Fe
2+
 
[Cl
 
2
|AsO
 
3
]
 
2
 · 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
)(AsO
 
3
)
 
0.7
(AsO
 
4
)
 
0.3
·7H
 
2
O
4.JD.15Tooeleite
Fe
3+
6
(AsO
 
3
)
 
4
(SO
 
4
)(OH)
 
4
· 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
22.2.1Sampleite
NaCaCu
 
5
[Cl|(PO
 
4
)
 
4
] · 5H
 
2
O
22.2.2Lavendulan
NaCaCu
 
5
[Cl|(AsO
 
4
)
 
4
] · 5H
 
2
O
22.2.3Apatite-(CaCl)
Ca
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.4Turneaureite
Ca
 
5
[Cl|(AsO
 
4
,PO
 
4
)
 
3
]
22.2.5Shubnikovite
Ca
 
2
Cu
 
8
[Cl|OH|(AsO
 
4
)
 
6
] · 7H
 
2
O
22.2.6Richelsdorfite
Ca
 
2
Cu
 
5
Sb[Cl|(OH)
 
6
|(AsO
 
4
)
 
4
] · 6H
 
2
O
22.2.7Alforsite
Ba
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.8Morelandite
(Ba,Ca,Pb)
 
5
[Cl|(AsO
 
4
,PO
 
4
)
 
3
]
22.2.9Pyromorphite
Pb
 
5
[Cl|(PO
 
4
)
 
3
]
22.2.10Mimetite
Pb
 
5
[Cl|(AsO
 
4
)
 
3
]
22.2.11Clinomimetite
Pb
 
5
[Cl|(AsO
 
4
)
 
3
]
22.2.12Sahlinite
Pb
 
14
[O
 
9
|(AsO
 
4
)
 
2
|Cl
 
4
]
22.2.13Georgiadèsite
Pb
 
16
[(OH)
 
6
|Cl
 
14
|(AsO
 
4
)
 
4
]
22.2.14Vanadinite
Pb
 
5
[Cl|(VO
 
4
)
 
3
]
22.2.15Kombatite
Pb
 
14
[O
 
9
|(VO
 
4
)
 
2
|Cl
 
4
]
22.2.16Leningradite
PbCu
 
3
[Cl|VO
 
4
]
 
2
22.2.17Hedyphane
Pb
 
3
Ca
 
2
[Cl|(AsO
 
4
)
 
3
]

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 & Rouse (1980): Nealite: a new mineral from Laurion Greece.: Mineralogical Record: 11: 299-301.

Guiseppetti et al. (1993): The crystal structure of nealite. Neues Jahrbuch für Mineralogie, Monatshefte 1993, 278-288.

Pertlik & Schnorrer (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
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  • Nealite details from Handbook of Mineralogy (PDF)
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  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
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    Localities for Nealite

    Hide Locality List
    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 Mts
        • Goslar
          • Astfeld
    		No reference listed
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
    		Min.Rec.(1980) 11, 299-301; Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian, 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
          • 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
    Mineral and/or Locality
    Google
     
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