... O 28 ] 6− decavanadate polyoxoanion and a novel [Al 4 (OH) 6 (H 2 O) 12 ] 6+ polyoxocation. * E-mail: akampf@nhm.org . Manuscript handled by G. Diego Gatta 17 3 2021 16 6 2021 Copyright © 2022 by the Mineralogical Society of America 2022 Mineralogical Society...

...Frank C. Hawthorne; John M. Hughes; Mark A. Cooper; Anthony R. Kampf ABSTRACT The decavanadate isopolyanion, [V 10 O 28 ] 6– , is a constituent of pascoite-family vanadate minerals and synthetic materials, and both protonated, [H x V 10 O 28 ] (6– x )– , and mixed-valence, [V 4+ x V 5+ 10– x )O 28...

...Anthony R. Kampf; Paul M. Adams; Barbara P. Nash; Joe Marty; John M. Hughes ABSTRACT Okieite, Mg 3 [V 10 O 28 ]·28H 2 O, is a new decavanadate mineral from the Burro mine, Slick Rock district, San Miguel County, Colorado, USA (type locality); the mineral is also found at the Hummer mine, Paradox...

...Mark A. Cooper; Frank C. Hawthorne; Anthony R. Kampf; John M. Hughes Abstract The decavanadate anion, [V 10 O 28 ] 6− , is a common constituent of vanadate minerals, and both protonated, [H x V 10 O 28 ] (6− x )− , and mixed-valent, [(V 4+ x V 5+ 10− x )O 28 ] (6+ x )− , derivatives also occur...

...Mark A. Cooper; Frank C. Hawthorne; Anthony R. Kampf; John M. Hughes Abstract The decavanadate anion, [V 10 O 28 ] 6− , is a common constituent in vanadate minerals and synthetic materials, and both protonated, [H x V 10 O 28 ] (6− x )− , and mixed-valent, [(V 4+ x V 5+ 10− x )O 28 ] (6+ x...

...Anthony R. Kampf; Barbara P. Nash; Paul M. Adams; Joe Marty; John M. Hughes Abstract Ammoniolasalite, [(NH 4 ) 2 Mg 2 (H 2 O) 20 ][V 10 O 28 ], is a new decavanadate species (IMA2017-094) from the Burro mine, Slick Rock district, San Miguel County, Colorado, USA (38°2′42″N 108°53′23″W). The mineral...

... to R 1 = 0.0946 for 2711 independent reflections with F > 4σ( F ). The structural unit in burroite is the [V 10 O 28 ] 6– decavanadate group; charge balance in the structure is maintained by the [Ca 2 (NH 4 ) 2 ·15H 2 O] 6+ interstitial complex. Linkage between the structural unit and the components...

... )( hkl )]: 8.92(100)( ), 10.70(31)(002), 9.77(28)(010), and 7.4539(22)( ). The atomic arrangement of hydropascoite was solved and refined to R 1 = 0.0488 for 8187 independent reflections with F > 4σ F . The structural unit in hydropascoite is the [V 10 O 28 ] 6– decavanadate group; charge balance...

..., USA, were described as hydronium-bearing decavanadate minerals with the formulae {[Ca(H 2 O) 7 ] 2 (H 2 O) 2 (H 3 O) 2 }{V 10 O 28 } and {[Na 2 (H 2 O) 10 ](H 3 O) 4 }{V 10 O 28 }, respectively. Because these phases correspond to known synthetic phases with these formulae, the presence of NH 4...

... )]: 10.34(57)( 1 ¯ 01), 8.27(100)(011,101), 7.90(21)(110), and 1.9814(22)( 1 ¯ 17, 2 ¯ 17). The atomic arrangement of bluestreakite was solved and refined to R 1 = 0.0339 for 7395 independent reflections with F > 4σ ( F ). The structural unit in bluestreakite is a partially reduced decavanadate group...

... was solved and refined to R 1 = 0.0379 for 3806 F o > 4σ F reflections. The structural unit is a decavanadate polyanion, (V 10 O 28 ) 6− ; charge balance in the structure is maintained by the [Na 2 Ca 2 (H 2 O)24] 6+ interstitial unit that exists as Na(H 2 O) 6 octahedra and Ca(H 2 O) 8 polyhedra...

... on the basis of 3,440 diffractions with F o > 4σ F . The structural unit is a decavanadate polyanion, (V 10 O 28 ) 6− . The interstitial unit linking the structural units has a composition of {[Ca(H 2 O) 7 ] 2 (H 2 O) 2 (H 3 O) 2 } 6+ , and is formed of an isolated [Ca(H 2 O) 7 ] 2+ polyhedron, a (H 3 O...

..., and 2.997(29)3̄31,401. The atomic arrangement of gunterite was refined to R 1 = 0.0632. The structural unit is a doubly-protonated decavanadate polyanion, {H 2 [V 10 O 28 ]}. The interstitial units linking the structural units contain two Na polyhedra; the Na2 polyhedron is split into two partially occupied...

...). The atomic arrangement of rakovanite has been refined to R 1 = 0.0383; the structural unit in the phase is formed of a triply-protonated decavanadate polyanion, {H 3 [V 10 O 28 ]}. The structural units are linked by the interstitial complexes, the (Na 3 ·15H 2 O) contents of which balance the +3 charges...

...)°. The structure was determined using direct methods and three-dimensional X-ray-diffraction data measured with a CCD detector and refined to R = 0.0289. The mineral is a member of the pascoite group of minerals, which have a structural unit containing the [V 10 O 28 ] 6− decavanadate polyanion. In lasalite...

... the hydrogen atoms allow us to assign the C 2/ m disordered model to the atomic arrangement. The structural unit, or anionic portion of the atomic arrangement in pascoite, is the decavanadate polyanion (V 10 O 28 ) 6− , similar to the decavanadate group found in hummerite and numerous synthetic vanadates...