Thulium(II) fluoride is one of the fluoride salts of the lanthanide metal thulium, with the chemical compound of TmF<sub>2</sub>. It can react with zirconium tetrafluoride at 900 ðC to form TmZrF<sub>6</sub>, which has a hexagonal structure. In addition, low-temperature Mössbauer spectroscopy and some theoretical studies of thulium(II) fluoride have also been reported.