...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...

... by the Mineralogical Society of America 2020 Mineralogical Society of America Caseyite new mineral polyoxometalate flat-Al 13 polyoxocation crystal structure Packrat mine Burro mine West Sunday mine Colorado Millions of synthetic compounds have been prepared in the laboratory, but only about...

... 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. §   Corresponding author e-mail address : akampf@nhm.org 22 May 2015 2 October 2015 © 2016...

... 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...

...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. Kegginite...

...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...

... 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...

... not reveal their presence or reliably measure their abundance. 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...

... to the H-correction of the 2013 database and a high number of very complex minerals 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...

... (or zinc), aluminium and carbonate, 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...

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

... methods, esterification between NAs and alcohol is an effective and low-cost approach due to its mild reaction conditions, high yield and few negative effects on the quality of the crude oil (Wang et al. , 2014b ; Khan et al. , 2017 ). Heteropolyacids (HPAs) are polyoxometalates composed...

... and gatewayite; Kampf et al. , 2016 ) are interesting in that they contain a novel polyoxometalate-like heteropolyanion, [As 3+ O 51 ] (11   +   x )– ( x  = 0 to 1.5), which is new to science. Another recently described mineral kegginite ( Kampf et al ., 2017 ) contains a mono-capped Keggin ε-isomer...

... caused the diverse mineralogy of the LPC pegmatites. Peterandresenite is a polyoxometalate (POM) compound, i.e. , it contains metal-oxygen polyhedra centred by group 5 or 6 transition-metal cations in high oxidation states (usually Mo, W, V, Nb or Ta), which link together to form a discrete anionic...

... them from the mixture by phase separation for easier and safer storage ( http://www.sandia.gov/news-center/news-releases/2002/mat-chem/mayday.html ). Menezesite is the first natural heteropolyniobate. Polyoxometalates are a large and rapidly growing class of compounds. Heteropolyoxoanions...