English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The crystal structure of metarossite, ideally CaV 2 O 6 ·2H 2 O [chemical name: calcium divanadium(V) hexa-oxide dihydrate], was first determined using precession photographs, with fixed isotropic displacement parameters and without locating the positions of the H atoms, leading to a reliability factor R = 0.11 [Kelsey &amp; Barnes (1960 ▸). Can. Mineral.  6 , 448-466]. This communication reports a structure redetermination of this mineral on the basis of single-crystal X-ray diffraction data of a natural sample from the Blue Cap mine, San Juan County, Utah, USA ( R 1 = 0.036). Our study not only confirms the structural topology reported in the previous study, but also makes possible the refinement of all non-H atoms with anisotropic displacement parameters and all H atoms located. The metarossite structure is characterized by chains of edge-sharing [CaO 8 ] polyhedra parallel to [100] that are themselves connected by chains of alternating [VO 5 ] trigonal bipyramids parallel to [010]. The two H 2 O mol-ecules are bonded to Ca. Analysis of the displacement parameters show that the [VO 5 ] chains librate around [010]. In addition, we measured the Raman spectrum of metarossite and compared it with IR and Raman data previously reported. Moreover, heating of metarossite led to a loss of water, which results in a transformation to the brannerite-type structure, CaV 2 O 6 , implying a possible dehydration pathway for the compounds M  2+ V 2 O 6 · x H 2 O, with M = Cu, Cd, Mg or Mn, and x = 2 or 4.

Redetermination of metarossite, CaV5+2O6·2H2O

Redetermination of metarossite, CaV⁵⁺₂O₆·2H₂O