Jamesite Mineral Data

General Jamesite Information

Chemical Formula:

Pb2Zn2Fe+++5(AsO4)5O4

Composition:

Molecular Weight = 1,583.01 gm

Zinc 8.26 % Zn 10.28 % ZnO

Iron 17.64 % Fe 25.22 % Fe₂O₃

Arsenic 23.66 % As 36.30 % As₂O₅

Lead 26.18 % Pb 28.20 % PbO

Oxygen 24.26 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₂Zn₂Fe³⁺₅(AsO₄)₅O₄

Environment:

Secondary mineral in oxidized lead ore in a dolostone-hosted hydrothermal polymetallic ore deposit.

IMA Status:

Approved IMA 1981

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Christopher James, one of the first mining engineers at the Tsumeb mine, Namibia.

Name Pronunciation:

Jamesite

Synonym:

ICSD 87744

PDF 35-509

Jamesite Image

Images:

Jamesite Duftite-beta

Comments: Reddish-brown bladed jamesite crystals overgrown with white dolomite and associated with dark green duftite.
Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image.
© Rruff Database

Jamesite Crystallography

Axial Ratios:

a:b:c =0.586:1:1.0715

Cell Dimensions:

a = 5.622, b = 9.593, c = 10.279, Z = 1; alpha = 109.8°, beta = 90.54°, gamma = 97.69° V = 516.88 Den(Calc)= 5.09

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.4(1), 3.04(0.9), 9.67(0.8),

Physical Properties of Jamesite

Color:

Reddish brown.

Density:

5.1

Hardness:

3 - Calcite

Luster:

Subadamantine

Optical Properties of Jamesite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1948,KPDmeas= 0.1944,KC= 0.192
Ncalc = 1.98

Optical Data:

Biaxial (-), a=1.96, b=1.995, g=2.02, bire=0.0600, 2V(Calc)=78, 2V(Meas)=75.

Calculated Properties of Jamesite

Electron Density:

Bulk Density (Electron Density)=4.58 gm/cc
note: Specific Gravity of Jamesite =5.10 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Jamesite= 474.52 barns/electron
U=PE_Jamesite x rElectron Density=2,173.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jamesite is Not Radioactive

Jamesite Classification

Dana Class:

41.11.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.11)with miscellaneous formulae

(41.11.02)Dana Group

41.11.02.01 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

Strunz Class:

08.BK.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BK -With medium-sized and large cations, (OH, etc.)

08.BK.25 Jamesite Pb2Zn2Fe5(AsO4)5O4 P1 1

08.BK.25 Lulzacite! Sr2Fe(Fe,Mg)2Al4(PO4)4(OH)10 P1 1

Other Jamesite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Jamesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Jamesite Specimen Label here :

Jamesite

Pb2Zn2Fe+++5(AsO4)5O4
Dana No: 41.11.02.01 Strunz No: 08.BK.25
Locality:

Notes:

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