Structure of nollmotzite, the first natural uranium-oxide containing fluorine

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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Structure of nollmotzite, the first natural uranium-oxide containing fluorine

Messaggio da Marco E. Ciriotti » ven 18 mag, 2018 11:36

Prossima pubblicazione.

Referenza:
▪ Plášil, J., Kampf, A.R., Škoda, R., Čejka, J. (2018): Nollmotzite, Mg[UV(UVIO2)2O4F3]·4H2O, the first natural uranium-oxide containing fluorine. Acta Crystallographica, B74, (in press):

Synopsis:
The twinned structure of the new uranium-oxide mineral was refined from the X-ray diffraction data and was found to contain fluorine and pentavalent uranium. The presence of pentavalent uranium is indicative of the reducing conditions under which the mineral formed. Nollmotzite is the first naturally occurring uranium-oxide mineral that contains fluorine.

NdR: L'approvazione recente della nuova specie è qui: viewtopic.php?f=5&t=14542

Mg[U5+(U6+O2)2O4F3]·4H2O
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 24596
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Structure of nollmotzite, the first natural uranium-oxide containing fluorine

Messaggio da Marco E. Ciriotti » gio 28 giu, 2018 15:40

Prossima pubblicazione.

Referenza:
▪ Plášil, J., Kampf, A.R., Škoda, R., Čejka, J. (2018): Nollmotzite, Mg[UV(UVIO2)2O4F3]·4H2O, the first natural uranium-oxide containing fluorine. Acta Crystallographica, B74, (in press).

Abstract:
Nollmotzite (IMA2017-100), Mg[UV(UVIO2)2F3O4](H2O)4, is a new uranium oxide fluoride mineral found in the Clara mine, Black Forest Mountains, Germany. Electron microprobe analysis provided the empirical formula (Mg1.06Cu0.02)Σ1.08[UV(UVIO2)2O3.85F3.15][(H2O)3.69(OH)0.31]Σ4.00 based on three U and 15 O + F atoms per formula unit. Nollmotzite is monoclinic, space group Cm, with a = 7.1015 (12) Å, b = 11.7489 (17) Å, c = 8.1954 (14) Å, β = 98.087 (14)°, V = 676.98 (19) Å3 and Z = 2. The crystal structure [twinned by reticular merohedry; refined to R = 0.0369 with GoF = 1.09 for 1527 unique observed reflections, I > 3σ(I)] is based upon [UV(UVIO2)2F3O4]2– sheets of β-U3O8 topology and contains an interlayer with MgF2(H2O)4 octahedra. Adjacent sheets are linked through F–Mg–F bonds, as well as via hydrogen bonds. The presence of fluorine and pentavalent uranium in the structure of nollmotzite has potentially important implications for the safe disposal of nuclear waste.

NdR: The name nollmotzite honors two German mineral collectors who discovered this new mineral; the name nollmotzite combines the first four letters of their surnames: Markus Noller (born 16.05.1977) and Reinhard Motzigemba (born 14.11.1952).
The fourth mineral known to contain pentavalent uranium {the others being wyartite, shinkolobweite, richetite and dehydrated wyartite, Ca(CO3)[U5+(U6+O2)2O4(OH)](H2O)3}; the first known naturally occurring uranium oxide that contains significant fluorine.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 24596
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Structure of nollmotzite, the first natural uranium-oxide containing fluorine

Messaggio da Marco E. Ciriotti » ven 03 ago, 2018 15:34

Pubblicazione effettuata.

Referenza:
▪ Plášil, J., Kampf, A.R., Škoda, R., Čejka, J. (2018): Nollmotzite, Mg[UV(UVIO2)2O4F3]·4H2O, the first natural uranium-oxide containing fluorine. Acta Crystallographica, B74, 362-369.
Marco E. Ciriotti

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