Boron-Oxygen Polyanion in the Crystal Structure of Tunellite

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Science  20 Sep 1963:
Vol. 141, Issue 3586, pp. 1178-1179
DOI: 10.1126/science.141.3586.1178


The crystal structure of tunellite, SrO·3B2O3·4H2O, with infinite sheets of composition n[B6O9(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.