The present invention relates to novel crystalline forms of (3-cyano-1H-indol-7-yl)-[4-(4-fluorophenethyl)piperazin-1-yl] methanone phosphate and to pharmaceutical compositions containing said forms. X-17526MLa présente invention concerne des formes cristallines atypiques de phosphate de méthanone (3-cyano-1H-indol-7-yl)-[4-(4-fluorophénéthyl)pipérazin-1-yl] et des compositions pharmaceutiques contenant les formes en question. X-17526M