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Metastudtite

A valid IMA mineral species
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About MetastudtiteHide

00362130016879944181048.jpg
Franz E. Studt
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.
Forms on dehydration of studtite.


Unique IdentifiersHide

Mindat ID:
2687
Long-form identifier:
mindat:1:1:2687:7
GUID
(UUID V4):
c9034e05-0230-4782-badb-70dcf8d95f9e

IMA Classification of MetastudtiteHide

Approved
First published:
1983

Classification of MetastudtiteHide

4.GA.15

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
7.16.5

7 : Oxides and Hydroxides
16 : Oxides of U

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MstuIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MetastudtiteHide

Silky
Colour:
Pale yellow
Streak:
Yellowish
Tenacity:
Flexible
Density:
4.67 g/cm3 (Calculated)

Optical Data of MetastudtiteHide

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.
Surface Relief:
Moderate
Dispersion:
r < v moderate
Optical Extinction:
Z = c (direction of elongation).
Pleochroism:
Not Visible

Chemistry of MetastudtiteHide

Mindat Formula:
UO4 · 2H2O

Crystallography of MetastudtiteHide

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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 MetastudtiteHide

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 MetastudtiteHide

Other Language Names for MetastudtiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Metastudtite associated with PhosphuranyliteKCa(H3O)3(UO2)7(PO4)4O4 · 8H2O
1 photo of Metastudtite associated with Soddyite(UO2)2SiO4 · 2H2O
1 photo of Metastudtite associated with BecquereliteCa(UO2)6O4(OH)6 · 8H2O

Related Minerals - Strunz-mindat GroupingHide

4.GA.05Metaschoepite(UO2)8O2(OH)12 · 10H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
4.GA.05ParaschoepiteUO3 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GA.05Schoepite(UO2)8O2(OH)12 · 12H2OOrth. mmm (2/m 2/m 2/m) : Pbca
4.GA.10IanthiniteU4+(UO2)5O7 · 10H2OOrth. mm2 : Amm2
4.GA.15Studtite[(UO2)(O2)(H2O)2] · H2OMon. 2/m : B2/b
4.GA.20PaulscherreriteUO2(OH)2Mon.
4.GA.25HeisenbergiteUO2(OH) · 2H2O (simplified UO3 · 2H2 O)Orth.

Fluorescence of MetastudtiteHide

Not fluorescent.

Other InformationHide

Notes:
Soluble without effervescence in hot HCl.
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 MetastudtiteHide

References for MetastudtiteHide

Localities for MetastudtiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
DR Congo (TL)
 
  • Haut-Katanga
    • Kambove Territory
      • Shinkolobwe
Deliens et al. (1983) +1 other reference
  • Lualaba
    • Mutshatsha
Gauthier et al. (1989)
Namibia
 
  • Hardap Region
    • Daweb
Bowell et al. (2017)
Norway
 
  • Nordland
    • Hamarøy
      • Drag
        • Eivollen
Husdal (2019)
    • Narvik
Husdal (2023)
Spain
 
  • Andalusia
    • Córdoba
Desor (08/2020)
USA
 
  • Utah
    • San Juan County
      • La Sal Creek Mining District
Chuck Adan collection +1 other reference
 
Mineral and/or Locality  
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