...Anthony R. Kampf; John M. Hughes; Barbara P. Nash; Joe Marty; Timothy P. Rose ABSTRACT Lumsdenite (IMA 2018–092), ideally NaCa 3 Mg 2 (As 3+ V 4+ 2 V 5+ 10 As 5+ 6 O 51 )·45H 2 O, is a rare new polyoxometalate mineral from the Packrat mine, Gateway district, Mesa County, Colorado, USA. Crystals...

... that the structure crystal partly dehydrated prior to data collection. The analyzed constituents were normalized to provide a total of 100% when combined with the calculated H 2 O. The chemical data are reported in Table 1 . Caseyite new mineral polyoxometalate flat-Al 13 polyoxocation crystal structure...

... with a structure based on a bicapped Keggin anion. The discovery of bicapite and numerous other natural polyoxometalate compounds in the Colorado Plateau uranium/vanadium deposits make that the most productive region found to date for naturally occurring polyoxometalate compounds. Polyoxometalate compounds...

... hosts for nuclear waste because of their resistance to weathering. Here we show that niobium can be highly mobile even at near-surface geochemical conditions as a soluble and unreactive polyoxometalate ion. Discovery of the first natural hexaniobate minerals, all formed at near-surface conditions...

...Anthony R. Kampf; George R. Rossman; Chi Ma; Donato Belmonte; Cristian Biagioni; Fabrizio Castellaro; Luigi Chiappino Ramazzoite (IMA2017-090), [Mg 8 Cu 12 (PO 4 )(CO 3 ) 4 (OH) 24 (H 2 O) 20 ][(H 0.33 SO 4 ) 3 (H 2 O) 36 ], is a new polyoxometalate (POM) mineral from the Monte Ramazzo mine, near...

... of all four new minerals contain the novel polyoxometalate-like heteropolyanion, [As 3+ As 5+ 6 V 4+ 2+ x V 5+ 10– x O 51 ] (11+ x )– ( x = 0 to 1.5), which is new to science. Fig. 7. Crystal drawing of packratite; clinographic projection in standard orientation. Vanarsite packratite...

... produces large channels along [100] that are filled with water molecules. The basic building block in the layers is a hexagonal ring of edge-shared octahedra with an AsO 4 tetrahedron attached to one side of the ring by corner-sharing. These polyoxometalate clusters, of composition [AsAl 6 O 11 (OH) 9 (H 2...

...John M. Hughes; Anthony R. Kampf; Barbara P. Nash; Joe Marty Abstract Sherwoodite, putatively Ca 4.5 (AlV 5+ 12 V 4+ 2 O 40 )·28H 2 O, was among the early naturally occurring polyoxometalates to be reported from the Uravan Mineral Belt; the ideal formula of sherwoodite is here redefined as Ca 5.5...

... and penberthycroftite. As a new polyoxometalate building block, this type of cluster may be expressed with a general chemical formula [ TM 6 X 25 ], where T = tetrahedrally coordinated cation, M = octahedrally coordinated cation, and X = O, OH, H 2 O. Fig. 2. A microscopic view of aggregates of colorless...

...Anthony R. Kampf; John M. Hughes; Chi Ma; Joe Marty; Timothy P. Rose Abstract Pomite (IMA2021-063), ideally Ca 3 [ V 5 4 + V 10 5 + O 37 (CO 3 )]·37H 2 O, and pseudopomite (IMA2021-064), ideally Ca 3.5 [ V 6 4 + V 9 5 + O 37 (CO 3 )]·32H 2 O, are two new polyoxometalate minerals from the Blue...

... . Kegginite is trigonal, P 3 ¯ , with a = 14.936(5), c = 15.846(5) Å, V = 3061(2) Å 3 , and Z = 2. The crystal structure of kegginite ( R 1 = 0.064 for 1356 F o > 4σ F reflections) contains a [ As 5 + V 12 5 + O 40 ( VO ) ] 12 − polyoxometalate cluster, which is a mono-capped Keggin ε-isomer. Powder...

...F. Kooli; C. Depege; A. Ennaqadi; A. de Roy; J. P. Besse Abstract Rehydration is shown to be straightforward for the reconstruction of polyoxometallate-pillared layered double hydroxides. Zn-Al hyfrotalcite-like minerals were prepared with Zn/Al ratios of 1 to 5 by coprecipitation at pH 7. Good...

... to contain [V 5 O 17 ] polyoxovanadate units. Polyoxovanadates (POVs) are a subclass of a larger family of polyoxometalates (POMs), metal-oxygen cluster compounds, which have unique structural and electronic properties that have proven to have a remarkable array of technological and biochemical uses...

... of America Protocaseyite new mineral polyoxometalate crystal structure Burro mine San Miguel County Colorado U.S.A. Low-temperature near-surface environments, particularly those containing highly charged metal cations, have the potential to form polyoxometalate ions. In recent years...

[email protected] 11 7 2021 20 11 2021 2022 decavanadate bond-valence theory Lewis acid Lewis base interstitial complex Polyoxometalates are compounds that contain a cluster or clusters, usually anionic, of three or more transition-metal-centered polyhedra that are linked...

..., which are then used to intercalate different organic molecules. Hu and Li are the authors of a chapter on Polyoxometalate Complexes of Layered Double Hydroxides. After outlining the structures of several polyoxometalates, conventional (exchange, coprecipitation, etc.) and less conventional (e.g...

...Fig. 6. Polyoxometallate clusters in penberthycroftite. The independent Al-centred octahedra are labelled 1 to 6. ...

... that have been discovered since 2013 (in particular, polyoxometalates; see below). The average chemical complexities (arithmetic means) are 1.63(1) bits per atom and 63(1) bits per formula, which account for the average number of 38.7 atoms per formula (based upon 5455 chemical formulae). The latter value...