Metastudtite
A valid IMA mineral species
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About Metastudtite
Formula:
UO4 · 2H2O
Colour:
Pale yellow
Lustre:
Silky
Specific Gravity:
4.67 (Calculated)
Crystal System:
Orthorhombic
Name:
Named as a dehydration product of studtite. The root name is for Franz Edward Studt (or Stüdt) (30 November 1873, London, England, UK - 3 July 1953, Holborn, England, UK), geologist for Tanganyika Concessions Ltd. He prepared an important geological map of Katanga, published in 1913.
Unique Identifiers
Mindat ID:
2687
Long-form identifier:
mindat:1:1:2687:7
GUID
(UUID V4):
(UUID V4):
c9034e05-0230-4782-badb-70dcf8d95f9e
IMA Classification of Metastudtite
Approved
First published:
1983
Classification of Metastudtite
4.GA.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
5.3.1.2
5 : OXIDES CONTAINING URANIUM OR THORIUM
3 : AXO4·xH2O
5 : OXIDES CONTAINING URANIUM OR THORIUM
3 : AXO4·xH2O
7.16.5
7 : Oxides and Hydroxides
16 : Oxides of U
7 : Oxides and Hydroxides
16 : Oxides of U
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 |
---|---|---|
Mstu | 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 Metastudtite
Optical Data of Metastudtite
Type:
Biaxial (+)
RI values:
nα = 1.640(2) nβ = 1.658(2) nγ = 1.760(2)
2V:
Measured: 47° , Calculated: 48°
Max Birefringence:
δ = 0.120
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:
Moderate
Dispersion:
r < v moderate
Optical Extinction:
Z = c (direction of elongation).
Pleochroism:
Not Visible
Chemistry of Metastudtite
Mindat Formula:
UO4 · 2H2O
Elements listed:
Crystallography of Metastudtite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 8.411(1) Å, b = 8.744(1) Å, c = 6.505(1) Å
Ratio:
a:b:c = 0.962 : 1 : 0.744
Unit Cell V:
478.39 ų
Z:
2
Morphology:
Fibrous, or as elongated tablets, to 3 mm; in nodules.
Comment:
Data from Rodriguez et al. (2016). Previously assumed to have space group Immm. "In light of the structure determination for studtite, it is likely that the correct unit cell of metastudtite is larger than previously thought, as the repeat length of the chain of uranyl polyhedra in studtite is 8.4 Å, and is not compatible with the 4.2 Å cell dimension" (Burns & Hughes, 2003).
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
5.22 Å | (100) |
4.38 Å | (50) |
3.79 Å | (50) |
3.538 Å | (80) |
3.214 Å | (50b) |
2.756 Å | (30) |
2.669 Å | (20) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
Stage 10b: Anthropogenic minerals | <10 Ka |
57 : Other minerals formed by human processes |
Type Occurrence of Metastudtite
General Appearance of Type Material:
Aggregates of flexible pale yellow fibers. Also as elongated tablets.
Place of Conservation of Type Material:
Royal Museum of Central Africa, Tervuren, Belgium, RGM13748 and RGM13755.
Geological Setting of Type Material:
Secondary uranium mineral.
Associated Minerals at Type Locality:
Synonyms of Metastudtite
Other Language Names for Metastudtite
German:Metastudtit
Spanish:Metastudtita
Common Associates
Associated Minerals Based on Photo Data:
2 photos of Metastudtite associated with Phosphuranylite | KCa(H3O)3(UO2)7(PO4)4O4 · 8H2O |
1 photo of Metastudtite associated with Soddyite | (UO2)2SiO4 · 2H2O |
1 photo of Metastudtite associated with Becquerelite | Ca(UO2)6O4(OH)6 · 8H2O |
Related Minerals - Strunz-mindat Grouping
4.GA.05 | Metaschoepite | (UO2)8O2(OH)12 · 10H2O |
4.GA.05 | Paraschoepite | UO3 · 2H2O |
4.GA.05 | Schoepite | (UO2)8O2(OH)12 · 12H2O |
4.GA.10 | Ianthinite | U4+(UO2)5O7 · 10H2O |
4.GA.15 | Studtite | [(UO2)(O2)(H2O)2] · H2O |
4.GA.20 | Paulscherrerite | UO2(OH)2 |
4.GA.25 | Heisenbergite | UO2(OH) · 2H2O (simplified UO3 · 2H2 O) |
Fluorescence of Metastudtite
Not fluorescent.
Other Information
Notes:
Soluble without effervescence in hot HCl.
Radioactive.
Radioactive.
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 Metastudtite
mindat.org URL:
https://www.mindat.org/min-2687.html
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External Links:
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References for Metastudtite
Reference List:
Deliens, Michel, Piret, Paul (1983) Metastudtite, UO4·2H2O, a new mineral from Shinkolobwe, Shaba, Zaire. American Mineralogist, 68 (3-4) 456-458
Burns, Peter C., Hughes, Karrie-Ann (2003) Studtite, [(UO2)(O2)(H2O)2](H2O)2: The first structure of a peroxide mineral. American Mineralogist, 88 (7) 1165-1168 doi:10.2138/am-2003-0725
Localities for Metastudtite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
DR Congo (TL) | |
| Deliens et al. (1983) +1 other reference |
| Gauthier et al. (1989) |
Namibia | |
| Bowell et al. (2017) |
Norway | |
| Husdal (2019) |
| Husdal (2023) |
Spain | |
| Desor (08/2020) |
USA | |
| Chuck Adan collection +1 other reference |
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Shinkolobwe Mine, Shinkolobwe, Kambove Territory, Haut-Katanga, DR Congo