Orthowalpurgite
A valid IMA mineral species
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About Orthowalpurgite
Formula:
(BiO)4(UO2)(AsO4)2 · 2H2O
Colour:
Pale yellow
Lustre:
Adamantine
Hardness:
4½
Crystal System:
Orthorhombic
Member of:
Name:
As an orthorhombic dimorph of walpurgite.
Unique Identifiers
Mindat ID:
3032
Long-form identifier:
mindat:1:1:3032:4
GUID
(UUID V4):
(UUID V4):
80bd5060-869b-4125-b576-0ec932fffaa4
Classification of Orthowalpurgite
Approved
Approval year:
1994
First published:
1995
Type description reference:
8.EA.05
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2
8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2
40.5.9.2
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
5 : AXO4·xH2O
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 |
|---|---|---|
| Owal | 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 Orthowalpurgite
Adamantine
Transparency:
Transparent
Colour:
Pale yellow
Streak:
Pale yellow
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
an indistinct cleavage parallel to {001}
an indistinct cleavage parallel to {001}
Fracture:
Conchoidal
Optical Data of Orthowalpurgite
Type:
Biaxial (-)
RI values:
nα = 1.910 nβ = 2.000 nγ = 2.050
2V:
Measured: 70° , Calculated: 70°
Max Birefringence:
δ = 0.140
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v
Pleochroism:
Non-pleochroic
Chemical Properties of Orthowalpurgite
Formula:
(BiO)4(UO2)(AsO4)2 · 2H2O
IMA Formula:
(UO2)Bi4O4(AsO4)2 · 2H2O
Crystallography of Orthowalpurgite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcm
Setting:
Pbcm
Cell Parameters:
a = 5.492(1) Å, b = 13.324(2) Å, c = 20.685(3) Å
Ratio:
a:b:c = 0.412 : 1 : 1.552
Unit Cell V:
1513.6 ų
Z:
4
Morphology:
Tabular on {010}, often elongated parallel to [100]. Forming fan-shaped aggregates.
Forms observed: {010}, {001}, {104} (rare), and {100}.
Forms observed: {010}, {001}, {104} (rare), and {100}.
Twinning:
None observed on type material
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Labels
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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) |
|---|---|---|---|---|---|---|---|
| 0006607 | Orthowalpurgite | Krause W, Effenberger H, Brandstatter F (1995) Orthowalpurgite, (UO2)Bi4O4(AsO4)2.2H2O, a new mineral from the Black Forest, Germany European Journal of Mineralogy 7 1313-1324 | 1995 | Black Forest, Germany | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.208 Å | (100) |
| 10.354 Å | (94) |
| 3.088 Å | (76) |
| 3.277 Å | (56) |
| 2.999 Å | (50) |
| 2.852 Å | (46) |
| 5.610 Å | (40) |
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] | |
| 47f : [Uranyl (U⁶⁺) minerals] |
Type Occurrence of Orthowalpurgite
General Appearance of Type Material:
Transparent yellow crystals uo to 0.3mm
Empirical Formula of Type Material:
(UO2)0.92Bi4.06O3.89(AsO4)2.07 · 1.99H2O
Chemical Analysis of Type Material:
| UO3 | 17.86 % |
|---|---|
| Bi2O3 | 64.21 % |
| As2O5 | 16.11 % |
| H2O (calc) | 2.43 % |
| Total: | 100.61 % |
Associated Minerals at Type Locality:
Reference:
Krause W, Effenberger H, Brandstatter F (1995) Orthowalpurgite, (UO2)Bi4O4(AsO4)2·2H2O, a new mineral from the Black Forest, Germany. European Journal of Mineralogy 7, 1313-1324
Synonyms of Orthowalpurgite
Other Language Names for Orthowalpurgite
Relationship of Orthowalpurgite to other Species
Member of:
Other Members of this group:
| Phosphowalpurgite | (BiO)4(UO2)(PO4)2 · 2H2O | Tric. 1 : P1 |
| Walpurgite | (BiO)4(UO2)(AsO4)2 · 2H2O | Tric. 1 : P1 |
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Orthowalpurgite associated with Walpurgite | (BiO)4(UO2)(AsO4)2 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.EA.05 | Walpurgite | (BiO)4(UO2)(AsO4)2 · 2H2O | Tric. 1 : P1 |
| 8.EA.05 | Phosphowalpurgite | (BiO)4(UO2)(PO4)2 · 2H2O | Tric. 1 : P1 |
| 8.EA.10 | Hallimondite | Pb2(UO2)(AsO4)2 · nH2O | Tric. 1 : P1 |
| 8.EA.10 | Parsonsite | Pb2(UO2)(PO4)2 | Tric. 1 : P1 |
| 8.EA.15 | Ulrichite | CaCu(UO2)(PO4)2 · 4H2O | Mon. 2/m : B2/m |
| 8.EA.20 | Lakebogaite | CaNaFe3+2H(UO2)2(PO4)4(OH)2 · 8H2O | Mon. m : Bb |
Fluorescence of Orthowalpurgite
Non-fluorescent
Other Information
Notes:
Soluble in warm dilute HCl ithout effervescence.
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 Orthowalpurgite
mindat.org URL:
https://www.mindat.org/min-3032.html
Please feel free to link to this page.
Please feel free to link to this page.
External Links:
Mineral Dealers:
References for Orthowalpurgite
Reference List:
Localities for Orthowalpurgite
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.
Germany | |
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Alt St Joseph Mine, Wittichen, Schenkenzell, Rottweil, Freiburg Region, Baden-Württemberg, Germany