...Maria Wierzbicka-Wieczorek; Uwe Kolitsch; Ekkehart Tillmanns Abstract Five new mixed-framework trisilicates were synthesised using a high-temperature flux growth technique. Colourless, glassy plates of SrY 2 Si 3 O 10 crystallise in space group P 1̅, with a = 6.757(1), b = 6.885(1), c = 9.273(2) Å...

...–O bond lengths is 0.002A. The crystal structure of rosenhahnite consists of Ca(1)O 7 , Ca(2)O 6 , and Ca(3)O 7 polyhedra and insular [Si 3 O 8 (OH) 2 ] groups. The trisilicate group with point symmetry 1 consists of a central SiO 4 tetrahedron sharing corners with two adjacent SiO 3 (OH) tetrahedra...

... pressure experiments. Am. Mineral. , 75 , 1020 –1028. Wierzbicka-Wieczorek, M., Kolitsch, U., Tillmanns, E. ( 2010 ): Synthesis and structural study of five new trisilicates, BaREE 2 Si 3 O 10 (REE = Gd, Er, Yb, Sc) and SrY 2 Si 3 O 10 , including a review on the geometry of the Si 3 O 10 unit...

...%. Pavlovskyite represents a 1:1 member of a polysomatic series with calcio-olivine γ-Ca 2 SiO 4 and kilchoanite Ca 6 (SiO 4 )(Si 3 O 10 ) as end-member modules. The structure is characterized by strongly folded trisilicate units (Si 3 O 10 ) interwoven with a framework of CaO 6 and CaO 8 polyhedra. Olivine-like...

...François Farges; Ralf Siewert; Gordon E. Brown, Jr.; Anne Guesdon; Guillaume Morin Abstract The coordination chemistry of molybdenum was investigated in nine series of synthetic silicate glasses, including sodium disilicate (NS2), sodium trisilicate (NS3), albite (Ab), anorthite (An), Ab 50 An 50...

...François FARGES; Stéphanie ROSSANO Abstract The local environment of ∼ 1400 ppm Zr in hydrous synthetic glasses (sodium trisilicate and albitic) has been probed at the Zr K-edge by X-ray Absorption Fine Structure (XAFS) spectroscopy and compared to that for natural glasses (volcanic and tektites...

...Fig. 6. Detail of the local environments of the triple silicate groups in demagistrisite. Approximately 7% of the trisilicate groups are substituted by a local “ardennite-like” structure with a further tetrahedra (in cyan) outside of the trisilicate group and the Si3 tetrahedron substituted...

...Fig. 2 View of BaYb 6 (Si 2 O 7 ) 2 (Si 3 O 10 ) along [100], showing the zigzag chains and the di- and trisilicate groups in the ratio 2:1. The unit cell is outlined, c * = c sinβ. ...

... = 83.977(2), β = 88.074(2), γ = 87.846(2)°, V = 755.8 Å 3 , and D x = 6.830 g/cm 3 . The type-L structure comprises linear trisilicate [Si 3 O 10 ] 8− and orthosilicate [SiO 4 ] 4− ions cross linked by REE 3+ in one sevenfold and five eightfold coordinated positions (to 3.0 Å), and is assembled from...

... and environmental interest, including sodium trisilicate glass and an aqueous chloride solution, at the Mo K and Au L III edges, respectively. Further studies based on CCWT phase terms are underway, in order to quantitatively characterize anharmonic information from EXAFS contributions. * E-mail: munoz...

... feature is the presence of an arsenatotrisilicate ion (AsSi 3 O 12 OH) 8− , comprising four tetrahedra linked together to form a chain fragment. This new ion is an extension of the trisilicate (Si 3 O 10 ) 8− ion with an additional As-centered tetrahedron linked to it. This example is the first of a new...