HoI3O9 is a chemical compound registered under CAS number 23340-47-8, with the molecular formula HI O3 . 1/3 Ho and a molecular weight of about 689.64 g/mol. Its EINECS (EC) number is 245-593-9. It is also known as Holmium triiodate. TwoChem supplies HoI3O9 for laboratory research and bulk production; product code 805157. Send an inquiry for purity, packaging, price and lead time.