Jamesite
A valid IMA mineral species
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About Jamesite
Formula:
Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10
Colour:
Reddish brown
Lustre:
Sub-Adamantine
Hardness:
3
Specific Gravity:
5.084 (Calculated)
Crystal System:
Triclinic
Name:
Named in honor of Christopher James, an American mining engineer, commissioned by OMEG to open the Tsumeb mine in 1900.
This page provides mineralogical data about Jamesite.
Unique Identifiers
Mindat ID:
2071
Long-form identifier:
mindat:1:1:2071:4
Similar Names
| Amesite | A valid IMA mineral species - grandfathered | Mg2Al(AlSiO5)(OH)4 |
| Jamesonite | A valid IMA mineral species - grandfathered | Pb4FeSb6S14 |
IMA Classification of Jamesite
Approved
IMA Formula:
Pb2+2Zn2+Fe3+2(Fe3+,Zn2+)4(As5+O4)4(OH)8(OH,O)2
Approval year:
1978
First published:
1981
Classification of Jamesite
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
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
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
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jms | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Jamesite
Sub-Adamantine
Transparency:
Transparent
Colour:
Reddish brown
Streak:
Pale brown
Hardness:
3 on Mohs scale
Density:
5.084 g/cm3 (Calculated)
Optical Data of Jamesite
Type:
Biaxial (-)
RI values:
nα = 1.960(5) nβ = 1.995(5) nγ = 2.020(5)
2V:
Measured: 75° (5), Calculated: 78°
Max. Birefringence:
δ = 0.060
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
strong
Optical Extinction:
Y ∧ a ≃ 5° on (001); Y ∧ a = 15° on (010).
Pleochroism:
Strong
Comments:
X = Y = pale brown; Z = deep red-brown.
Chemistry of Jamesite
Mindat Formula:
Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10
Element Weights:
Crystallography of Jamesite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.62 Å, b = 9.59 Å, c = 10.27 Å
α = 109.8°, β = 90.54°, γ = 97.69°
α = 109.8°, β = 90.54°, γ = 97.69°
Ratio:
a:b:c = 0.586 : 1 : 1.071
Unit Cell V:
515.21 ų (Calculated from Unit Cell)
Z:
1
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
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Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005590 | Jamesite | Cooper M A, Hawthorne F C (1999) Local Pb-_ disorder in the crystal structure of jamesite, Pb2ZnFe2(Fe2.8Zn1.2)(AsO4)4(OH)8[(OH)1.2O.8], and revision of the chemical formula The Canadian Mineralogist 37 53-60 |  | 1999 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.40 Å | (100) |
| 3.04 Å | (90) |
| 9.67 Å | (80) |
| 4.70 Å | (80) |
| 3.26 Å | (80) |
| 2.92 Å | (60) |
| 2.04 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Jamesite
General Appearance of Type Material:
Tabular crystals, elongated a, up to 0.5 x 0.2 x 0.05 mm.
Place of Conservation of Type Material:
Institute for Mineralogy and Crystal Chemistry, University of Stuttgart, Stuttgart, Germany, NM05.
National Museum of Natural History, Washington, D.C., USA, 143995.
National Museum of Natural History, Washington, D.C., USA, 143995.
Geological Setting of Type Material:
Oxidized zone of lead ore.
Associated Minerals at Type Locality:
Synonyms of Jamesite
Other Language Names for Jamesite
Common Associates
Associations Based on Photo Data:
| 13 photos of Jamesite associated with Duftite | PbCu(AsO4)(OH) |
| 8 photos of Jamesite associated with Tsumcorite | PbZn2(AsO4)2 · 2H2O |
| 8 photos of Jamesite associated with Dolomite | CaMg(CO3)2 |
| 6 photos of Jamesite associated with Goethite | Fe3+O(OH) |
| 5 photos of Jamesite associated with Siderite | FeCO3 |
| 5 photos of Jamesite associated with Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
Related Minerals - Strunz-mindat Grouping
| 8.BK.05 | Brazilianite | NaAl3(PO4)2(OH)4 |
| 8.BK.10 | Neustädtelite | Bi2Fe3+(Fe3+,Co)(AsO4)2(O,OH)4 |
| 8.BK.10 | Cobaltneustädtelite | Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4 |
| 8.BK.10 | Medenbachite | Bi2Fe3+Cu2+(AsO4)2O(OH)3 |
| 8.BK.15 | Curetonite | Ba(Al,Ti)(PO4)(OH,O)F |
| 8.BK.20 | Heyite | Pb5Fe2+2(VO4)2O4 |
| 8.BK.25 | Lulzacite | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| 8.BK.25 | Désorite | Pb2(Fe3+6Zn)O2(PO4)4(OH)8 |
| 8.BK.30 | Nishanbaevite | KAl2O(AsO4)(SO4) |
| 8.BK.35 | Zircarsite | Na18Cu12ZrO8(AsO4)8Cl6 |
| 8.BK.35 | Arsmirandite | Na18Cu12Fe3+O8(AsO4)8Cl5 |
| 8.BK.35 | Lebedevite | K4Na14Cu14O8(AsO4)8Cl6 |
| 8.BK.35 | Lehmannite | Na18Cu12TiO8(AsO4)8FCl5 |
Other Information
Notes:
Soluble, with difficulty, in hot HNO3 and HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Jamesite
mindat.org URL:
https://www.mindat.org/min-2071.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Jamesite
Localities for Jamesite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Europe | |
| Minceva-Stefanova (2001) | |
Greece | |
| |
| Rieck (1999) | |
Namibia (TL) | |
| Keller et al. (1981) +1 other reference |
USA | |
| - (2005) |
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Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia