title: Boron-Oxygen Polyanion in the Crystal Structure of Tunellite.
abstract: The crystal structure of tunellite, SrO.3B(2)O(3).4H(2)O, with infinite sheets of composition n[B(6)O(9)(OH)(2)](2-), has cations and water molecules in the spaces within the sheets. Adjacent sheets are held together by hydrogen bonding through the water molecules. The boron-oxygen polyanions provide the first example in hydrated borate crystals of one oxygen linked to three borons.
authors.forename: J R
authors.initials: JR
authors.lastname: Clark