Studtite
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Formula:
(UO2)O2(H2O)2 · 2H2O
System:
Monoclinic
Colour:
Very pale yellow to ...
Lustre:
Waxy
Name:
Named after Franz Edward Studt (or Stüdt). Dinah Pantic writes in http://www.mindat.org/mesg-7-192418.html. "Frank Edward Studt was my grandfather. He was trained as a metallurgist and graduated from imperial college in London about 1898. He was English and his parents originally from Germany. After graduating he worked in the belgium Congo for about 20 years for a Belgium company. I have many of his original diaries from this time"
A rare secondary uranium mineral containing a peroxide group in its crystal structure.
May dehydrate to metastudtite.
May dehydrate to metastudtite.
Classification of Studtite
Approved, 'Grandfathered' (first described prior to 1959)
4/H.01-20
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
5.3.1.1
5 : OXIDES CONTAINING URANIUM OR THORIUM
3 : AXO4·xH2O
5 : OXIDES CONTAINING URANIUM OR THORIUM
3 : AXO4·xH2O
7.16.6
7 : Oxides and Hydroxides
16 : Oxides of U
7 : Oxides and Hydroxides
16 : Oxides of U
Physical Properties of Studtite
Waxy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Very pale yellow to yellow
Optical Data of Studtite
Type:
Biaxial (+)
RI values:
nα = 1.545 nβ = 1.555 nγ = 1.680
Max Birefringence:
δ = 0.135
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Chemical Properties of Studtite
IMA Formula:
(UO2)O2(H2O)2 · 2H2O
Idealised Formula:
UO4 · 4H2O
Elements listed in formula:
Crystallography of Studtite
Crystal System:
Monoclinic
Cell Parameters:
a = 11.85 Å, b = 6.78 Å, c = 4.24 Å
β = 93.62°
β = 93.62°
Ratio:
a:b:c = 1.748 : 1 : 0.625
Unit Cell Volume:
V 339.97 ų (Calculated from Unit Cell)
Morphology:
Crusts and radial aggregates of flexible, fibrous crystals.
X-Ray Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.93 | (10) |
| 4.27 | (4) |
| 3.40 | (8) |
| 2.96 | (6) |
| 2.23 | (6) |
| 2.02 | (5) |
| 1.970 | (5b) |
Type Occurrence of Studtite
Relationship of Studtite to other Species
| 4.GA.05 | Metaschoepite | (UO2)8O2(OH)12 · 10H2O |
| 4.GA.05 | Paraschoepite | UO3 · (2-x)H2O |
| 4.GA.05 | Schoepite | (UO2)8O2(OH)12 · 12H2O |
| 4.GA.10 | Ianthinite | U24+(UO2)4O6(OH)4 · 9H2O |
| 4.GA.15 | Metastudtite | (UO2)O2(H2O)2 |
| 4.GA.20 | Paulscherrerite | UO2(OH)2 |
| 7.16.1 | Uraninite | UO2 |
| 7.16.2 | Schoepite | (UO2)8O2(OH)12 · 12H2O |
| 7.16.3 | Paraschoepite | UO3 · (2-x)H2O |
| 7.16.4 | Metaschoepite | (UO2)8O2(OH)12 · 10H2O |
| 7.16.5 | Metastudtite | (UO2)O2(H2O)2 |
| 7.16.7 | Ianthinite | U24+(UO2)4O6(OH)4 · 9H2O |
| 7.16.8 | Compreignacite | K2(UO2)6O4(OH)6 · 7H2O |
| 7.16.9 | Vandenbrandeite | CuUO2(OH)4 |
| 7.16.10 | Roubaultite | Cu2O2(UO2)3(CO3)2(OH)2 · 4H2O |
| 7.16.11 | Becquerelite | Ca(UO2)6O4(OH)6 · 8H2O |
| 7.16.12 | Rameauite | K2Ca(UO2)6O6(OH)4 · 6H2O |
| 7.16.13 | Agrinierite | K2Ca[(UO2)3O3(OH)2]2 · 5H2O |
| 7.16.14 | Protasite | Ba(UO2)3O3(OH)2 · 3H2O |
| 7.16.15 | Billietite | Ba(UO2)6O4(OH)6 · 8H2O |
| 7.16.16 | Bauranoite | BaU2O7 · 4-5H2O |
| 7.16.17 | Metacalciouranoite | (Ca,Na,Ba)U2O7 · 2H2O |
| 7.16.18 | Calciouranoite | (Ca,Ba,Pb,K,Na)U2O7 · 5H2O |
| 7.16.19 | Orthobrannerite | U4+U6+Ti4O12(OH)2 |
| 7.16.20 | Thorutite | (Th,U,Ca)Ti2(O,OH)6 |
| 7.16.21 | Davidite-(La) | La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| 7.16.22 | Davidite-(Ce) | Ce(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| 7.16.23 | Brannerite | UTi2O6 |
| 7.16.24 | Fourmarierite | Pb1-xO3-2x(UO2)4(OH)4+2x · 4H2O |
| 7.16.25 | Richetite | (Fe3+,Mg)xPb2+8.6(UO2)36O36(OH)24 · 41H2O |
| 7.16.26 | Curite | Pb3+x[(UO2)4O4+x(OH)3-x]2 · 2H2O |
| 7.16.27 | Masuyite | Pb(UO2)3O3(OH)2 · 3H2O |
| 7.16.28 | Vandendriesscheite | Pb1.6(UO2)10O6(OH)11 · 11H2O |
| 7.16.29 | Metavandendriesscheite | PbU7O22 · nH2O |
| 7.16.30 | Sayrite | Pb2(UO2)5O6(OH)2 · 4H2O |
| 7.16.31 | Wölsendorfite | Pb7(UO2)14O19(OH)4 · 12H2O |
| 7.16.32 | Clarkeite | Na(UO2)O(OH) · nH2O |
| 7.16.33 | Uranosphaerite | Bi(UO2)O2(OH) |
Other Names for Studtite
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Studtite
Reference List:
Vaes (1947) Bulletin société belge de Géologie, de paleontology et d’hydrologie, Brussels: 70: B 212.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 275.
Walenta, K. (1974): On studtite and its composition. Amer. Mineral., 59, 166–171.
American Mineralogist (1974): 59: 166-171.
Čejka, J., Sejkora, J. and Deliens, M. (1996): New data on studtite, UO4•4H2O, from Shinkolobwe, Shaba, Zaire. Neues Jahrbuch für Mineralogie, Monatshefte (1996): 125-134.
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.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 275.
Walenta, K. (1974): On studtite and its composition. Amer. Mineral., 59, 166–171.
American Mineralogist (1974): 59: 166-171.
Čejka, J., Sejkora, J. and Deliens, M. (1996): New data on studtite, UO4•4H2O, from Shinkolobwe, Shaba, Zaire. Neues Jahrbuch für Mineralogie, Monatshefte (1996): 125-134.
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.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Internet Links for Studtite
mindat.org URL:
https://www.mindat.org/min-3815.html
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Localities for Studtite
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.
symbol to view information about a locality.
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can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Austria | |
| Paar, W. & Ruscha, S. (1978): Karinthin 78, 23-29. |
| A. Strasser: Die Minerale Salzburgs, 1989 | |
Brazil | |
| Tony Nikischer |
China | |
| Aizhen Wang (1992): Acta Mineralogica Sinica 12(1), 78-82 |
| Anthony, J.W. et al.: Handbook of Mineralogy |
| Chen Zhangru, Huang Yuzhu, and Gu Xiaofa (1990): A new uranium mineral - Yingjiangite. Acta Mineralogica Sinica 10(2), 102-105. |
Czech Republic | |
| Pauliš P., Kopecký S., Černý P. 2007: Uranové minerály České Republiky a jejich naleziště. 1. část. (Kutna Hora, issue 1) |
| Pauliš, P., Novák, F., Ševců, J.: Sekundární minerály z uranového ložiska Jelení vrch u Horních Hoštic v Rychlebských horách. Acta Musei Moraviae, Scientiae geologicae, 2004, roč. 89, s. 121 - 138. |
Democratic Republic of Congo (Zaïre) | |
| Deliens, Michel (1992): Occurrence de roubaultite à Kamoto (Shaba, Zaïre). Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. 58, 295-296. |
| Am Min 59 (1974), 166; Čejka, J., Sejkora, J. and Deliens, M. (1996): New data on studtite, UO4•4H2O, from Shinkolobwe, Shaba, Zaire. N. Jb. Mineral. Mh. 1996, 125-134. |
| |
| Fleischer M, Cabri L J, Chao G Y, Mandarino J A, Pabst A (1982) New mineral names, American Mineralogist 67, 1074-1082 |
France | |
| |
| Le Règne Minéral, Hors Série IV, 1998 & Le Cahier des micromonteurs, 2002, N°75, pp 8-25 |
| Le Cahier des micromonteurs, 2002, N°75, pp 8-25 |
| Le Cahier des micromonteurs, 2002, N°75, pp 8-25 |
| [Le Règne Minéral 1997, 13, p.5-18] |
Germany | |
| No reference listed |
| Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German). |
| Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German); WALENTA, K. (1995): Neue Mineralfunde von der Grube Clara. 6. Folge, 1. Teil. - Lapis 20 (5), 33-38. |
Italy | |
| Borrelli, A., Callegari, A.M., Bolocchi, M., Ciriotti, M.E. (2013): Studtite: primo ritrovamento italiano. Micro, 2/2013, 88-92 |
Norway | |
| Kristiansen, R. (1990): Nye sekundære uranmineraler fra Bjertnes, Krødsherad. STEIN 17(1), 25-28 |
Switzerland | |
| - Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p. |
Ukraine | |
| Burakov, B.E., Strykanova, E.E., Anderson, E.B. (): Secondary Uranium Minerals on the Surface of Chernobyl “Lava”. MRS Proceedings: 465; : http://dx.doi.org/10.1557/PROC-465-1309 |
La Dorgissière Mine, Saint-Amand-sur-Sèvre, Deux-Sèvres, Nouvelle-Aquitaine, France