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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+
 
)[AsO
 
4
]
 
3
20.5.10Ludlockite
(Fe,Pb)As
 
2
O
 
6
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
German names:
Jamesit
Russian names:
Джемесит
Spanish names:
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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    Localities for Jamesite

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    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.
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    (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] (Kamareza; Kamariza)
            • Kamareza Mines
    		No reference listed
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		Chemie der Erde,(1981) 40, 105-109
    Mineral and/or Locality
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