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Metastudtite

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Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
© Stephan Wolfsried

Show Metastudtite Photos (5)



Formula:
UO
 
4
 · 2H
 
2
O
System:OrthorhombicColour:Pale yellow
Name:Named as a dehydration product of studtite.


Forms on dehydration of studtite.

Classification of Metastudtite

IMA status:Approved
Strunz 8th edition ID:4/H.01-30
Nickel-Strunz 10th (pending) edition ID:4.GA.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
G : Uranyl Hydroxides
A : Without additional cations
Dana 8th edition ID:5.3.1.2

5 : OXIDES CONTAINING URANIUM OR THORIUM
3 : AXO4·xH2O
Hey's CIM Ref.:7.16.5

7 : Oxides and Hydroxides
16 : Oxides of U
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Type Occurrence of Metastudtite

Type Locality:Shinkolobwe Mine (Kasolo Mine), Shinkolobwe, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre)
Year of Discovery:1983

Physical Properties of Metastudtite

Colour:Pale yellow

Crystallography of Metastudtite

Crystal System:Orthorhombic
Cell Parameters:a = 6.51(1) Å, b = 8.78(2) Å, c = 4.21(1) Å
Ratio:a:b:c = 0.741 : 1 : 0.479
Unit Cell Volume:V 240.63 ų (Calculated from Unit Cell)
Z:2
Morphology:Fibrous, or as elongated tablets, to 3 mm; in nodules.
Comment:Probable 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:
d-spacingIntensity
5.22 (100)
4.38 (50)
3.79 (50)
3.538 (80)
3.214 (50b)
2.756 (30)
2.669 (20)

Optical Data of Metastudtite

Type:Biaxial (+)
RI values: nα = 1.640 nβ = 1.658 nγ = 1.760
2V:Measured: 47° , Calculated: 48°
Maximum Birefringence:δ = 0.120

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v moderate

Chemical Properties of Metastudtite

Formula:
UO
 
4
 · 2H
 
2
O
Essential elements:H, O, U
All elements listed in formula:H, O, U

Relationship of Metastudtite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.GA.05Metaschoepite
UO
 
3
 · 1-2H
 
2
O
4.GA.05Paraschoepite
UO
 
3
 · 2H
 
2
O
4.GA.05Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
 · 12H
 
2
O
4.GA.05Paulscherrerite
UO
 
2
(OH)
 
2
4.GA.10Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
 · 10H
 
2
O
4.GA.15Studtite
[(UO
 
2
)(O
 
2
)(H
 
2
O)
 
2
] · H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.16.1Uraninite
UO
 
2
7.16.2Schoepite
(UO
 
2
)
 
8
O
 
2
(OH)
 
12
 · 12H
 
2
O
7.16.3Paraschoepite
UO
 
3
 · 2H
 
2
O
7.16.4Metaschoepite
UO
 
3
 · 1-2H
 
2
O
7.16.6Studtite
[(UO
 
2
)(O
 
2
)(H
 
2
O)
 
2
] · H
 
2
O
7.16.7Ianthinite
U
4+
 
(UO
 
2
)
 
5
O
 
7
 · 10H
 
2
O
7.16.8Compreignacite
K
 
2
(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 7H
 
2
O
7.16.9Vandenbrandeite
Cu(UO
 
2
)(OH)
 
4
7.16.10Roubaultite
Cu
 
2
(UO
 
2
)
 
3
(OH)
 
10
 · 5H
 
2
O
7.16.11Becquerelite
Ca(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 8H
 
2
O
7.16.12Rameauite
K
 
2
Ca(UO
 
2
)
 
6
(OH)
 
16
 · H
 
2
O
7.16.13Agrinierite
K
 
2
(Ca,Sr)(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 5H
 
2
O
7.16.14Protasite
Ba(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 3H
 
2
O
7.16.15Billietite
Ba(UO
 
2
)
 
6
O
 
4
(OH)
 
6
 · 4-8H
 
2
O
7.16.16Bauranoite
Ba(UO
 
2
)
 
2
(OH)
 
6
 · 1-2H
 
2
O
7.16.17Metacalciouranoite
(Ca,Ba,Pb,K
 
2
)U
 
2
O
 
7
 · 2H
 
2
O
7.16.18Calciouranoite
(Ca,Ba,Pb)U
 
2
O
 
7
 · 5H
 
2
O
7.16.19Orthobrannerite
U
4+
 
U
6+
 
Ti
 
4
O
 
12
(OH)
 
2
7.16.20Thorutite
(Th,U,Ca)Ti
 
2
(O,OH)
 
6
7.16.21Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.22Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
7.16.23Brannerite
(U
4+
 
,REE,Th,Ca)(Ti,Fe
3+
 
,Nb)
 
2
(O,OH)
 
6
7.16.24Fourmarierite
Pb(UO
 
2
)
 
4
O
 
3
(OH)
 
4
 · 4H
 
2
O
7.16.25Richetite
Pb(UO
 
2
)
 
4
O
 
5
 · 4H
 
2
O
7.16.26Curite
Pb
 
3
(UO
 
2
)
 
8
O
 
8
(OH)
 
6
 · 3H
 
2
O
7.16.27Masuyite
Pb(UO
 
2
)
 
3
O
 
3
(OH)
 
2
 · 3H
 
2
O
7.16.28Vandendriesscheite
PbU
 
7
O
 
22
 · 12H
 
2
O
7.16.29Metavandendriesscheite
PbU
 
7
O
 
22
 · nH
 
2
O n < 12
7.16.30Sayrite
Pb
 
2
(UO
 
2
)
 
5
O
 
6
(OH)
 
2
 · 4H
 
2
O
7.16.31Wölsendorfite
(Pb,Ca)U
 
2
O
 
7
 · 2H
 
2
O
7.16.32Clarkeite
(Na,Ca,Pb)(UO
 
2
)O(OH) · 0-1H
 
2
O
7.16.33Uranosphaerite
Bi(UO
 
2
)O
 
2
(OH)

Other Names for Metastudtite

Synonyms:
IMA1981-055
Other Languages:
German:Metastudtit
Spanish:Metastudtita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Metastudtite

Reference List:

- +
Walenta, K. (1974): On studtite and its composition. Amer. Mineral., 59, 166–171.

Deliens, M. and P. Piret (1983): Metastudtite, UO4•2H2O, a new mineral from Shinkolobwe, Shaba, Zaire. Amer. Mineral., 68, 456–458.

Bulletin of the Czech National Museum, Prague (2003): 11: 140.

Burns, P.C. and Hughes, K.-A. (2003) Studtite, [(UO2)(O2)(H2O)2]H2O: the first structure of a peroxide mineral. American Mineralogist: 88: 1165-1168.

Internet Links for Metastudtite

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    • Localities for Metastudtite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Democratic Republic of Congo (Zaïre)
     
    • Katanga (Shaba)
      • Katanga Copper Crescent
        • Kolwezi
    		MinRec 20:287-288
        • Shinkolobwe
    		Amer.Min.(1983) 68, 456-458
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