Ca H2 O12 P4 Averbuch-Pouchot M Zeitschrift fur Anorganische und Allgemeine Chemie 621 (1995) 506-509 Preparation and crystal structure of an acidic long-chain polyphosphate: Ca H2 (P O3)4 _cod_database_code 1008730 _database_code_amcsd 0016611 5.686 9.676 8.844 90 92.35 90 P2_1/c atom x y z Ca1 0 0 0 P1 .71337 .21375 .70018 P2 .38759 .22230 .44098 O1 .8624 .19127 .11754 O2 .8139 .41292 .27346 O3 .5795 .19490 .32061 O4 .4984 .84314 .40931 O5 .1801 .12789 .4003 O6 .3280 .36819 .4577 H1 .812 .559 .155