Jurbanite
A valid IMA mineral species
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About Jurbanite
Joseph J. Urban
Formula:
Al(SO4)(OH) · 5H2O
Colour:
colourless
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
1.786
Crystal System:
Monoclinic
Name:
Named in honor of Joseph John Urban (27 October 1915, Chester, Pennsylvania, USA – 1997), Tucson, Arizona, USA, mineral collector who first observed the natural material.
Dimorph of:
Unique Identifiers
Mindat ID:
2125
Long-form identifier:
mindat:1:1:2125:4
Similar Names
| Urbanite | A variety of Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
IMA Classification of Jurbanite
Approved
IMA Formula:
Al(S6+O4)(OH)·5H2O
Approval year:
1974
First published:
1976
Classification of Jurbanite
7.DB.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.9.10.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.6.2
25 : Sulphates
6 : Sulphates of Al and Tl
25 : Sulphates
6 : Sulphates of Al and Tl
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 |
|---|---|---|
| Jur | 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 Jurbanite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Density:
1.786(8) g/cm3 (Measured) 1.828 g/cm3 (Calculated)
Optical Data of Jurbanite
Type:
Biaxial (-)
RI values:
nα = 1.459(2) nβ = 1.473(2) nγ = 1.483(2)
2V:
Measured: 80° , Calculated: 80°
Max. Birefringence:
δ = 0.024
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:
Moderate (negative)
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:
none
Chemistry of Jurbanite
Mindat Formula:
Al(SO4)(OH) · 5H2O
Element Weights:
Elements listed:
Crystallography of Jurbanite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.3965(6) Å, b = 12.479(2) Å, c = 8.1549(9) Å
β = 101.917(6)°
β = 101.917(6)°
Ratio:
a:b:c = 0.673 : 1 : 0.653
Unit Cell V:
836.05 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Minute crystals and stalactites.
Comment:
Space Group: P21/n.
Crystallographic forms of Jurbanite
Crystal Atlas:
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Jurbanite - {110}, {011}
3d models and HTML5 code kindly provided by
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Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0010939 | Jurbanite | Sabelli C (1985) Refinement of the crystal structure of jurbanite, Al(SO4)(OH)*5H2O Zeitschrift fur Kristallographie 173 33-39 |  | 1985 | Cetine mine, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.723 Å | (100) |
| 4.013 Å | (90) |
| 6.80 Å | (80b) |
| 4.954 Å | (80) |
| 4.494 Å | (80) |
| 5.74 Å | (70) |
| 3.922 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Jurbanite
General Appearance of Type Material:
small, clear, colorless crystals
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 144003.
Geological Setting of Type Material:
post-mine stalactite
Associated Minerals at Type Locality:
Synonyms of Jurbanite
Other Language Names for Jurbanite
Common Associates
Associations Based on Photo Data:
| 2 photos of Jurbanite associated with 'Natroalunite-2c' | (Na,Ca0.5,K)Al3(SO4)2(OH)6 |
| 1 photo of Jurbanite associated with Khademite | Al(SO4)F · 5H2O |
| 1 photo of Jurbanite associated with Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| 1 photo of Jurbanite associated with Azurite | Cu3(CO3)2(OH)2 |
| 1 photo of Jurbanite associated with Chalcanthite | CuSO4 · 5H2O |
| 1 photo of Jurbanite associated with Gearksutite | Ca[Al(F,OH)5(H2O)] |
| 1 photo of Jurbanite associated with Dioptase | CuSiO3 · H2O |
Related Minerals - Strunz-mindat Grouping
| 7.DB.05 | Svyazhinite | (Mg,Mn2+,Ca)(Al,Fe3+)(SO4)2F · 14H2O |
| 7.DB.05 | Aubertite | CuAl(SO4)2Cl · 14H2O |
| 7.DB.05 | Magnesioaubertite | (Mg,Cu)Al(SO4)2Cl · 14H2O |
| 7.DB.10 | Rostite | Al(SO4)(OH) · 5H2O |
| 7.DB.10 | Khademite | Al(SO4)F · 5H2O |
| 7.DB.20 | Minasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Anorthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.20 | Orthominasragrite | (V4+O)(SO4) · 5H2O |
| 7.DB.25 | Bobjonesite | (V4+O)(SO4) · 3H2O |
| 7.DB.27 | Karpovite | Tl2VO(SO4)2(H2O) |
| 7.DB.30 | Metahohmannite | Fe3+2(SO4)2O · 4H2O |
| 7.DB.30 | Hohmannite | Fe3+2(SO4)2O · 8H2O |
| 7.DB.30 | Amarantite | Fe3+2(SO4)2O · 7H2O |
| 7.DB.35 | Calciocopiapite | CaFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Zincocopiapite | ZnFe3+4(SO4)6(OH)2 · 18H2O |
| 7.DB.35 | Aluminocopiapite | Al2/3Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Copiapite | Fe2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Cuprocopiapite | Cu2+Fe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Magnesiocopiapite | MgFe3+4(SO4)6(OH)2 · 20H2O |
| 7.DB.35 | Ferricopiapite | Fe3+0.67Fe3+4(SO4)6(OH)2 · 20H2O |
Other Information
Notes:
Soluble in H2O
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 Jurbanite
mindat.org URL:
https://www.mindat.org/min-2125.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Jurbanite
Reference List:
Anthony, John W., McLean, W. John (1976) Jurbanite, a new post-mine aluminum sulfate mineral from San Manuel, Arizona. American Mineralogist, 61 (1-2) 1-4
Localities for Jurbanite
Showing 11 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.
Canada | |
| Geological Association of Canada (2014) |
Chile | |
| Färber (n.d.) |
Czech Republic | |
| Žáček et al. (1995) |
France | |
| Audra et al. (2007) |
Italy | |
| Apollaro et al. (2023) |
| Sabelli C. (1984) +2 other references |
Japan | |
| Seki et al. (1987) |
Spain | |
| Mingueza et al. (Min. Catalunya/Paragénesis, 2025) |
USA (TL) | |
| Anthony et al. (1976) +1 other reference |
| Eckel et al. (1997) |
| Coskren et al. (2000) +1 other reference |
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San Manuel orebody, San Manuel Mine, Pinal County, Arizona, USA