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Jamesite

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Formula:
Pb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
System:
Triclinic
Colour:
Reddish brown
Hardness:
3
Isostructural with:
This page provides mineralogical data about Jamesite.

Classification of Jamesite

Approved
8.BK.25

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
K : With medium-sized and large cations, (OH, etc.):RO4 = 2:1, 2.5:1
41.11.2.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : Miscellaneous
20.5.15

20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
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Type Occurrence of Jamesite

Year of Discovery:
1981

Physical Properties of Jamesite

Sub-Adamantine
Colour:
Reddish brown
Hardness (Mohs):
3

Crystallography of Jamesite

Crystal System:
Triclinic
Cell Parameters:
a = 5.62Å, b = 9.59Å, c = 10.27Å
α = 109.8°, β = 90.54°, γ = 97.69°
Ratio:
a:b:c = 0.586 : 1 : 1.071

Optical Data of Jamesite

Type:
Biaxial (-)
RI values:
nα = 1.960 nβ = 1.995 nγ = 2.020
2V:
Measured: 75° , Calculated: 78°
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong

Chemical Properties of Jamesite

Formula:
Pb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
Essential elements:
All elements listed in formula:

Relationship of Jamesite to other Species

8.BK.05BrazilianiteNaAl3(PO4)2(OH)4
8.BK.10MedenbachiteBi23+Fe3+(Cu,Fe3+)(AsO4)2(OH,O)4
8.BK.10NeustädteliteBi23+Fe3+(Fe3+,Co)(O,OH)4(AsO4)2
8.BK.10CobaltneustädteliteBi23+Fe3+(Co,Fe3+)(O,OH)4(AsO4)2
8.BK.15CuretoniteBa(Al,Ti)(PO4)(OH,O)F
8.BK.20HeyitePb5Fe22+(VO4)2O4
8.BK.25LulzaciteSr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10
20.5.1CafarsiteCa5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
20.5.2SchultenitePb(HAsO4)
20.5.3DuftitePbCu(AsO4)(OH)
20.5.4BayldonitePbCu3(AsO4)2(OH)2
20.5.5PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
20.5.6ArsendescloizitePbZn(AsO4)(OH)
20.5.7HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
20.5.8ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
20.5.9Caryinite(Na,Pb)(Ca,Na)(Ca,Mn2+)(Mn2+,Mg,Fe3+)2(AsO4)3
20.5.10LudlockitePbFe43+As103+O22
20.5.11GabrielsonitePbFe(AsO4)(OH)
20.5.12CarminitePbFe23+(AsO4)2(OH)2
20.5.13SegnititePbFe33+(AsO4)2(OH,H2O)6
20.5.14TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
20.5.16MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
20.5.17Arsenbrackenbuschite

Other Names for Jamesite

Name in Other Languages:
German:Jamesit
Spanish:Jamesita

Other Information

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

References for Jamesite

Reference List:
Keller, P., Hess, H., Dunn, P. J. (1981): Jamesite, Pb2Zn2Fe53+O4(AsO4)5, a new mineral from Tsumeb, Namibia.
Chemie der Erde 40, 105-109.

American Mineralogist (1981): 66: 1275.

Cooper, M. A. & Hawthorne, F. C. (1994): Local Pb2+-◻ disorder in the crystal structure of jamesite, Pb2ZnFe3+2(Fe3+2.8Zn1.2)(AsO4)4(OH)8[(OH)1.2O0.8], and revision of the chemical formula. Canadian Mineralogist, 37, 53-60.

Internet Links for Jamesite

Localities for Jamesite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Bulgaria
 
  • Vratsa Oblast (Vratza)
    • Balkan Mts (Stara Planina)
Minceva-Stefanova, J. (2001). Arsenate minerals diversity in oxidation zones of the polymetallic stratabound deposits in Western Balkan Mountain. Comptes Rendus de l'Academie Bulgare des Sciences, 54(6), 39.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
          • Kamariza Mines (Kamareza Mines)
No reference listed
Lapis No.7/8 1999 p.70-74
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
Chemie der Erde,(1981) 40, 105-109; Gebhard, G. (1999): Tsumeb II. A Unique Mineral Locality. GG Publishing, Grossenseifen, Germany
Mineral and/or Locality  
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