Hafnium (Hf) has no independent ore in nature; it is always closely symbiotic with zirconium (Zr) in a homogeneous form, and accounts for only approximately 2% of Zr.
https://www.lifetechnology.com/blogs/life-technology-science-news/highly-efficient-separation-and-enrichment-of-hafnium-achieved-by-advanced-membrane-separation-system
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