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Jamesite

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Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
© 2004 ROM

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Formula:
Pb
 
2
Zn(Fe
2+
 
,Zn)
 
2
Fe
3+
4
[(OH)
 
10
|(AsO
 
4
)
 
4
]
System:TriclinicColour:Reddish brown
Hardness:3
Isostructural with:Lulzacite
This page provides mineralogical data about Jamesite.

Classification of Jamesite

IMA status:Approved
Strunz 8th edition ID:7/B.24-70
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.11.2.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : Miscellaneous
Hey's CIM Ref.: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

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Year of Discovery:1981

Physical Properties of Jamesite

Lustre: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
Unit Cell Volume:V 515.21 ų (Calculated from Unit Cell)

Optical Data of Jamesite

Type:Biaxial (-)
RI values: nα = 1.960 nβ = 1.995 nγ = 2.020
2V:Measured: 75° , Calculated: 78°
Maximum Birefringence:δ = 0.060

Chart 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:
Pb
 
2
Zn(Fe
2+
 
,Zn)
 
2
Fe
3+
4
[(OH)
 
10
|(AsO
 
4
)
 
4
]
Essential elements:As, Fe, H, O, Pb, Zn
All elements listed in formula:As, Fe, H, O, Pb, Zn

Relationship of Jamesite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BK.05Brazilianite
NaAl
 
3
[(OH)
 
2
|PO
 
4
]
 
2
8.BK.10Medenbachite
Bi
3+
2
Fe
3+
 
(Cu,Fe
3+
 
)[(OH,O)
 
2
|AsO
 
4
]
 
2
8.BK.10Neustädtelite
Bi
3+
2
Fe
3+
 
(Fe
3+
 
,Co)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
8.BK.10Cobaltneustädtelite
Bi
3+
2
Fe
3+
 
(Co,Fe
3+
 
)
 
2
[(O,OH)|OH|AsO
 
4
]
 
2
8.BK.15Curetonite
Ba
 
4
Al
 
3
Ti(PO
 
4
)
 
4
(O,OH)
 
6
8.BK.20Heyite
Pb
 
5
Fe
2+
2
[O
 
2
|VO
 
4
]
 
2
8.BK.25Lulzacite
Sr
 
2
Fe
2+
 
(Fe
2+
 
,Mg)
 
2
Al
 
4
[(OH)
 
10
|(PO
 
4
)
 
4
]
Related Minerals - Hey's Index Grouping:

- +
20.5.1Cafarsite
Ca
 
8
(Ti,Fe,Fe,Mn)
 
6-7
(AsO
 
3
)
 
12
·4H
 
2
O
20.5.2Schultenite
PbHAsO
 
4
20.5.3Duftite
PbCu[OH|AsO
 
4
]
20.5.4Bayldonite
Cu
 
3
Pb[OH|AsO
 
4
]
 
2
20.5.5Philipsbornite
PbAl
 
3
[(OH)
 
5
|(AsO
 
4
)
 
2
] · H
 
2
O
20.5.6Arsendescloizite
PbZn[OH|AsO
 
4
]
20.5.7Helmutwinklerite
Pb(Zn,Cu)
 
2
[AsO
 
4
]
 
2
 · 2H
 
2
O
20.5.8Thometzekite
Pb(Cu,Zn)
 
2
[AsO
 
4
,SO
 
4
]
 
2
 · 2(H
 
2
O,OH)
20.5.9Caryinite
(Na,Pb)(Ca,Na)(Ca,Mn
2+
 
)(Mn
2+
 
,Mg,Fe
3+
 
)
 
2
[AsO
 
4
]
 
3
20.5.10Ludlockite
PbFe
3+
4
As
3+
10
O
 
22
20.5.11Gabrielsonite
PbFe[OH|AsO
 
4
]
20.5.12Carminite
PbFe
3+
2
[OH|AsO
 
4
]
 
2
20.5.13Segnitite
PbFe
3+
3
[(OH,H
 
2
O)
 
6
|(AsO
 
4
)
 
2
]
20.5.14Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
20.5.16Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
20.5.17Arsenbrackenbuschite

Other Names for Jamesite

Synonyms:
IMA1978-079
Other Languages:
German:Jamesit
Russian:Джемесит
Spanish:Jamesita

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 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

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  • Raman and XRD data at RRUFF project
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    Localities for Jamesite

    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.
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
        • Lavrion District Mines
          • Agios Konstantinos [St Constantine] (Kamariza)
            • Kamariza Mines (Kamareza Mines)
    		No reference listed
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Chemie der Erde,(1981) 40, 105-109
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. 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. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 7th Nov 2009 05:34:23