Proshchenkoite-(Y) from Russia — a new mineral species in the vicanite group: descriptive data and crystal structure

Raade, Gunnar; Grice, Joel D.; Erambert, Muriel; Kristiansson, P.; Witzke, Thomas

doi:10.1180/minmag.2008.072.5.1071

Cited by 8 publications

(1 citation statement)

References 7 publications

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“…In recent years, several new borate-containing minerals have been reported in which some phosphate exists as a minor component. These minerals include byzantievite, proshchenkoite, hundholmenite, okanoganite-(Y), and vicanite-(Ce) . While the first study of borophosphate was conducted almost 150 years ago, systematic research on crystalline borophosphates has been performed during the past 18 years .…”

Section: Introductionmentioning

confidence: 99%

Novel Fundamental Building Blocks and Site Dependent Isomorphism in the First Actinide Borophosphates

Polinski

Malcherek

et al. 2013

Inorg. Chem.

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( 5 -y ) -As y O (20-x) (OH) x }] (x = 1.43, y = 2.24) (AgNBPU-3), have been prepared by the H 3 BO 3 −NH 4 H 2 PO 4 /NH 4 H 2 AsO 4 flux method. The structure of AgNBPU-1 has an unprecedented fundamental building block (FBB), composed of three BO 4 and six PO 4 tetrahedra which can be written as 9□:[Φ] □⟨3□⟩□|□⟨3□⟩□|□⟨3□⟩□|. Two Ag atoms are linearly coordinated; the coordination of a third one is T-shaped. AgNBPU-2 and AgNBPU-3 are isostructural and possess a FBB of two BO 4 and five TO 4 (T = P, As) tetrahedra (7□:□⟨4□⟩□|□). AgNBPU-3 is a solid solution with some PO 4 tetrahedra of the AgNBPU-2 end-member being substituted by AsO 4 . Only two out of the three independent P positions are partially occupied by As, resulting in site dependent isomorphism. The three compounds represent the first actinide borophosphates.

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