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The crystal structure of yuksporite, (Sr,Ba) 2 K 4 (Ca,Na) 14 (⃞ ,Mn,Fe){(Ti,Nb) 4 (O,OH) 4 [Si 6 O 17 ] 2 [Si 2 O 7 ] 3 }(H 2 O,OH) n , where n ∼ 3 [monoclinic, P2 1 /m, a = 7.126(3), b = 24.913(6), c = 17.075(7) Å, β = 101.89(3)°, V = 2966.4(17) Å 3 ] has been solved using X-ray synchrotron radiation data collected from a needle-like crystal with dimensions of 6 × 6 × 50 µm 3  at the Swiss-Norwegian beamline BM01 of the European Synchrotron Research Facility (ESRF, Grenoble, France). The structure was refined to R 1  = 0.101 on the basis of 2359 unique observed reflections with |F o | ≥ 4σ F . The structure of yuksporite is based upon titanosilicate nanorods elongated along a and with an elliptical cross-section of ca. 16 × 19 Å = 1.6 × 1.9 nm. Silicate tetrahedra form double xonotlite-like chains  1  ∞ [Si 6 O 17 ] oriented parallel to (001). Two  1  ∞ [Si 6 O 17 ] chains are linked into a rod via TiO 6  octahedra and Si 2 O 7  double tetrahedra. The {(Ti,Nb) 4 (O,OH) 4 [Si 6 O 17 ] 2 [Si 2 O 7 ] 3 } nanorods are porous. The internal pores are defined by eight-membered rings (8MR) with open diameters of 3.2 Å. The interior of the titanosilicate nanorods is occupied by Sr, Ba, K, and Na cations and H 2 O molecules. The nanorods are separated by walls of Ca coordination polyhedra that are parallel to (010) and link the rods into a three-dimensional structure.

american mineralogist

Letter. Porous titanosilicate nanorods in the structure of yuksporite, (Sr,Ba) 2 K 4 (Ca,Na) 14 (⃞,Mn,Fe) {(Ti,Nb) 4 (O,OH) 4 [Si 6 O 17 ] 2 [Si 2 O 7 ] 3 }(H 2 O,OH) n , resolved using synchrotron radiation