...Fabrice Dal Bo; Frédéric Hatert; Maxime Baijot Abstract Four beryllophosphates with general formula M 2+ Be 2 P 2 O 8 ( M 2+ = Ca, Sr, Pb, Ba) have been synthesized under hydrothermal conditions at 200 °C. Their crystal structures were solved by direct methods and refined by full-matrix least...

... pegmatite bodies, either as replacements of early Be-bearing phases such as beryl, or in miarolitic cavities. Many of the minerals concerned (phosphates of beryllium and beryllophosphates of a great variety of cations) are extremely rare, known only from their type localities. To date, the overall number...

... tetrahedral ring is a recurring motif in beryllophosphate structures. Bond valence analysis provides a valuable tool in understanding the tetrahedral linkages in beryllophosphate structures. When used in conjunction with the Be/P ratio, it can place limitations on the possible linkages in unknown...

... , with a = 11.655(5), c = 4.692(2) Å, and Z = 1. Tiptopite is isotypic with the members of the cancrinite group, being the beryllophosphate analogue of basic (hydroxyl) cancrinite, and could therefore be considered a zeolite. The tetrahedral framework is geometrically identical to that of cancrinite but is composed...

...Roland C. Rouse; Donald R. Peacor; Stefano Merlino Abstract The beryllophosphate mineral pahasapaite, (Ca 5.5 Li 3.6 K 1.2 Na 0.2 □ 13.5 )Li 8 Be 24 P 24 O 96 ·38H 2 O is cubic, I 23, with a = 13.781(4) Å and Z = 1. Its structure, which has been refined to residuals of 0.047 (unweighted) and 0.035...

...Frédéric Hatert; Fabrice Dal Bo; Yannick Bruni; Nicolas Meisser; Pietro Vignola; Andrea Risplendente; François-Xavier Châtenet; Julien Lebocey ABSTRACT Limousinite, ideally BaCa[Be 4 P 4 O 16 ]·6H 2 O, is a new beryllophosphate mineral discovered in the Vilatte-Haute pegmatite, Chanteloube near...

..., based on single-crystal X-ray diffraction data, to R 1 = 4.58%; the beryllophosphate framework is similar to that occurring in pahasapaite, and is based on zeolite-RHO cages. The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification...

.... The crystal structures of fransoletite and parafransoletite also contain beryllophosphate chains topologically identical to that found in faheyite, although the [Be(PO 4 )(PO 3 OH)] chain in fransoletite and parafransoletite is straight, whereas the [Be(PO 4 ) 2 ] chain in faheyite forms a helix about...

...) Å 3 (ZnPO 4 -CAN). Both phases are basic cancrinites. Their channel filling is compared with naturally occurring beryllophosphate cancrinite tiptopite and a previously described ZnPO4 cancrinite, which was prepared in a high temperature synthesis with a large number of different cations. CoPO 4 -CAN...

... is biaxial positive with α = 1.562(2), β = 1.564(2), γ = 1.588(2); Euler angles are ϕ = 98°, θ = 85°, ψ = −13°; 2 V (calc) = 33°. Parafransoletite, like most beryllophosphate minerals, results from the reaction of beryl with P-bearing hydrothermal solutions. The formation of these minerals is probably highly...

...F ig . 6. Be–P linkages for (a) the beryllophosphate framework structure of babefphite and (b) the cluster for gainesite. The (BeO 4 ) tetrahedra have a cross pattern, and the (PO 4 ) tetrahedra are indicated with dashed lines. ...

..., particularly in granitic pegmatites ( Černý 2002 ). Beryllophosphates, such as hydroxylherderite and beryllonite, are commonly known as products of the alteration of primary beryl from various pegmatite subtypes ( e.g., Nysten & Gustafsson 1993 , Černá et al. 2002 , Cempírek & Novák 2006...

... other locality. Weinebenite , Ca[Be 3 (PO 4 ) 2 (OH) 2 ]·5H 2 O, is known only from its type locality , the Weinebene pegmatites in Carinthia, Austria ( Walter et al. 1990 ). Weinebenite has a tetrahedral beryllophosphate framework, with three-membered rings of tetrahedra, and Ca plus H 2 O...

... Hatert, F., Dal Bo, F., Bruni, Y., Meisser, N., Vignola, P., Risplendente, A., Châtenet, F.-X., & Lebocey, J., Limousinite, BaCa[Be 4 P 4 O 16 ]·6H 2 O, a new beryllophosphate mineral with a phillipsite-type framework, 815 Hatert, F. with Galliski, M.A., 733 Hawthorne, F.C. with Day, M.C...

... ): Hydrothermal synthesis and low temperature crystal structure of an ammonium beryllophosphate with the merlinoite topology . Micropor. Mesopor. Mat. , 26 , 61 – 66 . Della Ventura G. Parodi G.C. Burragato F. Mottana A. ( 1993 ): Nuovi dati sulla merlinoite e su zeoliti affini...