** Chengdu Galaxy Magnets SZSE:300127 falls as much as 5.5% to 38.5 yuan; set for biggest one-day pct decline since April 11
** Stock on track to snap two straight sessions of gains
** Chinese rare earth magnet components and parts developer and producer expects China's rare earth export control measures to have certain impact on its export business
** YTD, stock up 57.2%