Hafnium(IV) oxychloride (HfOCl₂·xH₂O) is a versatile white solid and a key intermediate in the purification and chemistry of hafnium. https://www.noahchemicals.com/product/hafnium-iv-oxychloride-octahydrate-99-9-pure-20-mesh-hafnyl-chloride-octahydrate-hafniumdichloride-oxide-octahydrate-hfocl%e2%82%82-8h%e2%82%82o/